Night sky September 2026 — The best things to see this month

The night sky tonight and on any clear night offers an ever-changing display of fascinating objects you can see, from stars and constellations to bright planets, the moon, and sometimes special events like meteor showers.

Observing the night sky can be done with no special equipment, although a sky map can be very useful, and a good telescope or binoculars will enhance some experiences and bring some otherwise invisible objects into view.

You can also use astronomy accessories to make your observing easier, and use our Satellite Tracker page powered by N2YO.com to find out when and how to see the International Space Station and other satellites. We also have a helpful guide on how you can see and track a Starlink satellite train.

You can also capture the night sky by using any of the best cameras for astrophotography, along with a selection of the best lenses for astrophotography.

Monthly sky watching information is provided to Space.com by Jules-Pierre Malartre of Starry Night Education, the leader in space science curriculum solutions. Follow Starry Night on X @StarryNightEdu.

Editor's note: If you have an amazing skywatching photo and would like to share it with Space.com's readers, send your photo(s), comments, and your name and location to spacephotos@space.com.

Calendar of observing highlights

Tuesday, Sept. 1 — The Andromeda Galaxy

Look to the northeast in the evening and try to spot our neighboring galaxy with binoculars. The Andromeda Galaxy (M31) will appear as a distinct, fuzzy, elongated smudge of light.


A medium-aperture telescope under dark skies will be sufficient to trace the dark dust lanes running along the galaxy's edge. You will also be able to spot Andromeda's two brighter satellite galaxies: M32 and M110.


A DSLR camera on a standard tripod can capture beautiful pictures of M31. Use a 50 mm to 200 mm lens, open up the aperture to f/2.8 or f/4, and stack several 2-to-3-second exposures to bring out the core and spiral arms. Smart telescopes can easily resolve the dust lanes.


Use averted vision: By looking slightly off to the side of the galaxy's core, your eye's more light-sensitive rod cells will reveal a much wider expanse of the faint spiral arms.

Wednesday, Sept. 2 — Venus south of Spica

Shortly after sunset, look for bright Venus over the south-western horizon. Venus sits just south of the blue-white, first-magnitude star Spica by less than 2 degrees.


You can observe the phase of Venus using a telescope. Like the moon, Venus exhibits phases, and noting its illumination percentage provides a great sense of its orbital position relative to Earth.


A smartphone on a tripod using "Night Mode" will easily capture this encounter. Tap on Venus to focus, then manually lower the exposure slider so the glare doesn't wash out Spica.


Atmospheric dispersion can cause Venus to look like a tiny rainbow when it is low on the horizon. If you have an Atmospheric Dispersion Corrector (ADC) for your telescope, this is the time to dial it in.

Thursday, Sept. 3 — The Blinking Planetary Nebula

Take advantage of the pristine early evening hours tonight before the 53% illuminated waning gibbous moon crests the eastern horizon around 10:50 p.m. While the sky is still dark, point your telescope high overhead toward the constellation Cygnus to hunt down one of the night sky's most interactive deep-sky objects: the Blinking Planetary Nebula (NGC 6826).

Through a small telescope at low power, this object mimics a standard 9th-magnitude star. However, once you bump up the magnification to 100x or more, it reveals a fantastic optical illusion driven by the anatomy of the human eye. When you stare directly at the nebula, your eye's central vision focuses on the bright, 10th-magnitude dying star at its core, causing the surrounding gas shell to seemingly vanish. But if you shift your gaze slightly to the side (a technique called averted vision), your eye's more light-sensitive peripheral rods take over, and the bright blue-green nebulosity suddenly "blinks" back into view. You can rapidly look back and forth to make the nebula blink on and off like a cosmic strobe light.

While Oxygen-III (OIII) or Ultra High Contrast (UHC) filters are highly recommended for most planetary nebulas, use caution here! Threading one of these filters onto your eyepiece will drastically improve the contrast of the outer gas shell, but it will simultaneously dim the central star so much that it completely ruins the "blinking" effect. Enjoy the optical illusion without a filter first, then add the filter to study the nebula's structural details.

If you are setting up a camera, you will need a telescope with a relatively long focal length (1500 mm or more) to resolve this compact, high-surface-brightness target. Because of its bright core, standard long-exposure astrophotography can easily overexpose and "blow out" the central star. Instead, try utilizing planetary imaging techniques: shoot high-speed, unguided video and stack only the sharpest frames to preserve both the pinpoint central star and the vivid, blue-green halo surrounding it.

Friday, Sept. 4 — Last quarter moon (predawn)

While the moon is half-illuminated, focus on the terminator line — the dividing line between lunar day and night — where shadows cast by mountains and crater walls are longest and most dramatic.


This is a great time to trace the rugged, jagged peaks of the Lunar Apennines (Montes Apenninus) near the center of the terminator, and then scan south to the crater Tycho. While Tycho's famous bright rays are virtually invisible during this phase, the low angle of the setting sun throws its deep, terraced walls and distinct central peak into stunning three-dimensional relief.

A smartphone held to a telescope eyepiece (or using an inexpensive mounting bracket) works wonders here. Tap the terminator line on your screen to lock focus and exposure.


Use a neutral density or variable polarizing lunar filter for a better observing experience. Even at Last Quarter, the moon is incredibly bright through a telescope, and a filter will reduce eye strain and increase surface contrast.

Saturday, Sept. 5 — The Double Cluster in Perseus

Located halfway between Cassiopeia and Perseus, this pair of open clusters (NGC 869 & NGC 884) is a breathtaking naked-eye patch that explodes into twin diamond bursts in binoculars.


Scan the clusters with a telescope and try to pick out the distinct red supergiant stars scattered among the hot, young blue-white stars.


This duo is an excellent target for beginner tracking mounts. A modest telephoto lens (135 mm to 300 mm) will beautifully frame both clusters against the rich Milky Way background.


A gentle tap on the telescope tube will make the faintest stars momentarily pop out, taking advantage of your eye's sensitivity to motion.

Sunday, Sept. 6 — Mars 3° south of the moon (predawn)

In the early morning hours, the reddish point of light Mars will sit a few degrees below a beautiful waning crescent moon.
 The 3-degree closest approach will occur later on during the day, in full daylight, but the predawn hours provide an opportunity to view the two solar system objects in the same patch of sky.

If the local seeing conditions are steady, push the magnification on your telescope to see if you can resolve any dark albedo features on the Martian surface or catch a hint of a polar ice cap.


This event provides a perfect landscape astrophotography opportunity. Use a wide-angle lens to frame the moon and Mars rising together above local foreground elements like trees or buildings.


Pay attention to the color contrast. The pale, silvery light of the lunar crescent beautifully exaggerates the rusty, ochre tint of Mars.

Monday, Sept. 7 — Waning crescent & earthshine (predawn)

Even though the moon officially reached perigee late yesterday afternoon, it is still remarkably close to Earth this morning in the predawn hours. This proximity makes its very thin waning crescent appear slightly larger than usual. Look for "earthshine," the ghostly glow illuminating the unlit portion of the lunar disk. It is also called the da Vinci glow.

Because the moon is still hovering near perigee, its angle and closeness continue to exaggerate libration effects. Look for features near the extreme lunar limb that are usually hidden on the far side but are temporarily tipped into view.

When imaging, expose specifically for the Earthshine. A 1-to-2-second exposure at a moderate ISO through a telescope or telephoto lens will overexpose the bright crescent but reveal incredible detail on the dark side.

Physically hold your hand up to block the brightly lit crescent from your vision. Shielding that direct light makes the Earthshine dramatically easier to observe.

Tuesday, Sept. 8 — Lunar occultation of Jupiter & moon buzzes the Beehive (predawn)

Although the moon will officially pass directly in front of Jupiter in a rare lunar occultation today, this exact moment occurs mid-afternoon during full daylight for North American East Coast observers. While advanced astronomers can attempt to track the daytime occultation using telescopes and video astronomy, the most accessible and beautiful view occurs during the predawn hours. Head outside around 5:00 a.m. EDT and look east to see a stunning, tight grouping of a thin waning crescent moon, brilliant Jupiter, and the glittering Beehive Cluster (M44).

Use binoculars or a wide-field telescope to sweep this spectacular morning trio. While you won't see the planet vanish behind the moon at this early hour, you can spot Jupiter's four Galilean moons and the dozens of stars that make up the Beehive all sharing the same patch of sky.

This predawn gathering provides a perfect wide-field astrophotography opportunity. Mount your camera or smartphone on a tripod and use a medium telephoto lens. A short exposure of 1 to 2 seconds will easily capture the glowing lunar crescent, the piercing light of Jupiter, and the faint starlight of the Beehive Cluster against the dark morning sky.

Because the Beehive Cluster's stars are relatively faint, you can use a classic observing trick: tap the side of your telescope or binoculars gently. The slight vibration causes the fainter stars in the cluster to jump into view, as the human eye is highly sensitive to movement in low-light conditions.

Wednesday, Sept. 9 — The zodiacal light (predawn)

A two-week window to view the zodiacal light opens today for observers in northern latitudes. The Zodiacal Light is a faint, pyramid-shaped glow rising in the east before morning twilight. It is caused by sunlight reflecting off interplanetary dust. Timing and location are everything in order to observe the Zodiacal Light. You must be far from city lights, looking east, around 4:00 a.m. EDT.

Trace the cone of light as high as possible. Under pristine, dark skies, you can follow this glow deep into the zodiacal constellations that lie along the ecliptic. The base of the light cone will start near Cancer, resting just above the horizon, stretching upward through Gemini, and reaching high into the predawn sky toward Taurus.

Capturing the Zodiacal Light is very similar to photographing the Milky Way. You will want a fast, wide-angle lens (such as a 14 mm lens at f/2.8) to properly frame the sweeping diagonal of these constellations. Use a high ISO (1600 to 3200) and take a 15-to-20-second exposure on a fixed tripod.

Thursday, Sept. 10 — The Triangulum Galaxy

The Triangulum Galaxy (M33) is a face-on spiral galaxy. Because its light is spread out over an area larger than the full moon, it has very low surface brightness. Use binoculars from a dark location to spot this faint galaxy.


With an 8-inch or larger telescope, hunt for NGC 604. It looks like a fuzzy star, but it is actually a massive star-forming HII region inside the Triangulum Galaxy itself.


Because of its low surface brightness, M33 demands an equatorial tracking mount for astrophotography. Take multiple exposures of 2 to 5 minutes each and stack them to reveal the vibrant blue spiral arms and pink starburst regions.


Never underestimate how much local light pollution can ruin M33. If you can't see it, throw a dark blanket or observing hood over your head at the eyepiece to block out stray neighborhood lights.

Friday, Sept. 11 — Almost new moon & the Veil Nebula

Tonight, the almost new moon provides a pristine, dark sky. The Veil Nebula — an enormous supernova remnant spanning a full 3 degrees of sky — would normally make the ultimate grab-and-go binocular target. However, because its light is so diffusely spread out, its ultra-low surface brightness means binoculars simply won't do the job. Instead, use this moonless night to trace the prominent cross shape of the constellation Cygnus soaring straight overhead, right through the dark rift of the Milky Way.

Use an 8-inch or larger telescope to hunt down the Western Veil (NGC 6960), often called the Witch's Broom. It sweeps directly behind the naked-eye star 52 Cygni, making it easy to locate. If the seeing is exceptionally clear, pan east to trace the sweeping, highly structured filaments of the Eastern Veil (NGC 6992).

The Veil Nebula complex is huge. Use a wide-field refractor or a camera with a 200 mm lens on a tracking mount if you intend on imaging it. Long exposures will reveal the intricate, delicate threads of red hydrogen-alpha and blue-green oxygen gas left behind by this ancient supernova.

An Oxygen-III (OIII) filter is practically a requirement for this target. The supernova remnant emits light heavily in the OIII wavelength. Using this filter will make the nebula's ethereal filaments suddenly "pop" out of the black background sky.

Saturday, Sept. 12 — Mercury north of the moon

While the exact mathematical conjunction — where Mercury sits precisely 4 degrees north of the moon — occurs at 3:29 a.m. EDT, both objects will be well below the horizon for observers on the East Coast of North America at that moment.

The best time to actually see this pairing will be later that evening, around 7:20 p.m. EDT, immediately after the sun has set. Because the moon moves rapidly along its orbit, the two celestial objects will be much farther apart by nightfall (separated by roughly 10 degrees), but they can still be observed together in the same patch of the western sky.

Catching Mercury in a telescope is tough due to its low altitude and the thick atmosphere. Try to observe its phase, which will look like a tiny, shimmering gibbous disk because its surface is currently 93% illuminated by the sun.

This event represents a beautiful twilight photo op. Put your smartphone or camera on a tripod, include some colorful twilight clouds or landscape features, and use a 1-to-2-second exposure.

Use binoculars to sweep the horizon to find Mercury, but never begin searching until you are absolutely certain the sun has completely dipped below the horizon to avoid severe eye damage. Exercise extreme caution when pointing any optical equipment, including cameras, at celestial objects that are close to the sun, since inadvertently pointing your equipment at the sun might cause serious or even irreparable damage to your eyes.

Sunday, Sept. 13 — The Blue Snowball

Spend time identifying the constellations of Andromeda and Pegasus, where our deep-sky target resides.


Locate the Blue Snowball, planetary nebula (NGC 7662). At low power, it looks exactly like a star. Push the magnification beyond 150x to resolve its slightly annular (ring-like) structure and distinct cyan color.


Smart telescopes work wonders for astrophotography here, but because the target is small, they will render it as a tiny, bright blue dot. For traditional rigs, use a Barlow lens to increase focal length.


Use an Oxygen-III (OIII) filter. If you're sweeping the star field trying to find the nebula, hold the OIII filter between your eye and the eyepiece. The stars will dim, but the planetary nebula will remain bright, instantly giving away its position.

Monday, Sept. 14 — Venus and the crescent moon

While observers in Europe, Asia, and Africa will see the moon occult Venus today (with the global occultation window occurring between 09:26 and 13:42 UT / 5:26 a.m. and 9:42 a.m. EDT), North American observers will be treated to a close conjunction instead. At the exact moment of conjunction, the bright planet will sit just south of the crescent moon.

Finding Venus is much easier today because you can use the moon as your guidepost. Focus your telescope on the lunar edge first, then simply scan just below it to find Venus. Watch closely through the eyepiece as the lunar mountains and valleys on the limb glide incredibly close to the bright disk of Venus.

To view this pairing against a truly dark sky, your best opportunity is right after the sun has set (around 7:20 p.m. EDT). You will need to act quickly, as both objects will be getting low on the southwestern horizon and preparing to set.

This incredibly tight evening pairing provides a fantastic photo op. Set your camera to a fast shutter speed to cut through any remaining twilight glare and capture both the lunar terminator and the bright planet in the same frame before they dip below the horizon.

Tuesday, Sept. 15 — The Garnet Star (Mu Cephei)

Located just below the "house" shape of the constellation Cepheus, this star is one of the reddest objects visible to the naked eye, and its deep garnet color is an interesting target for binoculars.

Mu Cephei is a semiregular variable star, meaning its brightness slowly fluctuates between magnitude 3.4 and magnitude 5.1. You can easily track these changes with the naked eye by comparing it to stable reference stars nearby in the constellation. Use Zeta Cephei, which shines at magnitude 3.35, as your "maximum brightness" guide. If Mu Cephei matches Zeta, it is peaking. For a mid-range comparison, look at Epsilon Cephei (magnitude 4.2). Finally, to see if the Garnet Star has reached its absolute dimmest state, compare it to 19 Cephei, which shines at a steady magnitude 5.1. Log its brightness tonight and check back in a few weeks or months to see if it has visibly dimmed or brightened.

You can turn this variability into a simple, long-term astrophotography experiment using just a smartphone on a tripod. Switch your phone's camera to "Pro" or "Manual" mode and dial in a 2-to-3-second exposure at a moderate ISO (e.g., ISO 400 or 800). Take a photo tonight, and then use those exact same locked settings to photograph the star field again later in the autumn. When you place the photos side by side, the difference in the Garnet Star's brightness compared to the surrounding static stars will be distinctly captured.

To exaggerate the star's stunning ruby color on your sensor, intentionally roll the manual focus ring slightly out of focus—this spreads the star's light over more pixels, making the red hue pop brilliantly.

Due to the Purkinje effect in human vision, intensely red stars can appear to fluctuate in brightness the longer you stare at them. To see its true magnitude when making your visual comparisons, glance at it briefly, look away, and then look back.

Wednesday, Sept. 16 — The Great Pegasus Cluster (M15)

Look just off the nose of the constellation Pegasus. Binoculars will reveal the Great Pegasus Cluster as a fuzzy, perfectly round snowball of light, but M15 has one of the most densely packed cores of any globular cluster.

Use high magnification (at least 200x) to try and resolve individual stars right to the very center. Observers using massive telescopes can even hunt for Pease 1, a tiny planetary nebula nestled inside the cluster.

The core of M15 is notoriously bright and easy to blow out. When shooting with a tracking mount or smart telescope, use shorter exposure times (15-30 seconds) rather than minutes-long subs to preserve the core detail.

High magnification is your friend for globular clusters. It darkens the background sky, which increases contrast and makes it much easier to resolve the faint outer halo of stars.

Thursday, Sept. 17 — Antares shines close to the moon (evening)

The moon makes a dramatic, grazing pass right next to Antares, the ruby-red heart of the constellation Scorpius. While a true occultation is visible from parts of Australia, Tasmania, Antarctica and nearby southern regions, North America still gets to see a beautiful close conjunction.

Antares has a faint green companion star (Antares B). It is notoriously difficult to split due to the glare of the main star, but the proximity of the moon provides an excellent celestial marker to guide your high-power eyepieces right to the target.

Antares is so voluminous (a red supergiant) that capturing its distinct color right next to the illuminated lunar limb makes for a stunning, high-contrast composite image.

Using a specialized colored filter (like a light green or blue) on your eyepiece can help tame the harsh glare of the moon, making it easier to observe the red star right next to it.

Friday, Sept. 18 — First quarter moon

The moon reaches first quarter today and is ideally placed in the evening sky. Look to the fully illuminated right side of the moon to spot the dark, smooth basaltic plains of the lunar "seas." With just your naked eye or binoculars, you can spot the distinct, standalone dark oval of Mare Crisium (the Sea of Crises) near the right edge. Just to the left of it lie the massive, interconnected dark patches of the Sea of Serenity and the Sea of Tranquility — the historic landing site of Apollo 11.

Scour the terminator line for the famous "Lunar X" and "Lunar V" optical illusions. The "X" is a clair-obscur effect formed by grazing sunlight catching the high rims of the craters Blanchinus, La Caille, and Purbach, while their deep floors remain in pitch black. The "V" appears farther north near the crater Ukert. The exact peak of this phenomenon occurs mid-afternoon before the moon rises for the East Coast. However, because these illuminated crater rims are incredibly bright, you can actually spot them through a telescope in full daylight! Your absolute best time to hunt for these striking geometric shapes is in the late afternoon (roughly 4:00 p.m. to 7:00 p.m.) as the sun begins to lower and the shadows lengthen. Catch them quickly before the sun rises too high over the lunar surface, which will fully illuminate the crater floors and wash out the stark shadows.

This is a perfect night for mosaic imaging. Take several overlapping photos of the northern, equatorial, and southern regions of the moon, and stitch them together in software like Microsoft ICE or Photoshop for a high-res masterpiece.

Don't observe the full moon if you want to see craters. The First Quarter phase provides the perfect grazing sunlight along the terminator line necessary to throw deep shadows and create a stunning three-dimensional landscape.

Saturday, Sept. 19 — Venus greatest illuminated extent & moon at apogee

Venus mathematically reached its greatest illuminated extent at 23:00 UTC yesterday (Sept. 18), but it is still near its absolute brightest in our sky tonight. It will be piercingly bright. The moon is also at apogee, its farthest point from Earth.

Because Venus is so bright, you can attempt to observe it during daytime. Stand in the shadow of a building to completely block the sun, and carefully scan the clear blue sky roughly 38 degrees to the east (or to the left) of the hidden sun's position to spot the planet's brilliant white pinpoint of light.

Venus is so intensely bright that it easily causes lens flare. Stop down your camera lens (use a higher f-number like f/8) to achieve sharper focus and create a beautiful "sunburst" effect on the planet.

The best time to observe Venus through a telescope is actually during civil twilight (about 15 to 20 minutes after sunset), not full astronomical darkness. At this time, the sun is only about 3 degrees below the western horizon, leaving the sky a bright, vivid blue. This brighter background sky acts as a natural neutral-density filter. It tames the terrible irradiation and glare you would normally get against a pitch-black sky, revealing Venus as a beautifully sharp, distinct crescent rather than a blinding blob of light — making it a fantastic and visually striking telescopic target.

Sunday, Sept. 20 — The Saturn Nebula (NGC 7009)

In a small telescope, this planetary nebula in Aquarius appears as a bright, slightly elongated, greenish-blue star. Once you increase the magnification (250x or more if seeing permits), you can spot the faint "ansae" or handles protruding from either side of the nebula, which give it a strikingly similar appearance to the planet Saturn. Threading an Oxygen-III (OIII) or Ultra High Contrast (UHC) filter onto your eyepiece is highly recommended for visual observing; it will darken the background sky and heavily boost the contrast of these faint handles.

Because it is small and bright, you need a significant focal length (1500 mm+) to image its shape. Use planetary imaging techniques by shooting high-speed video and stacking the sharpest frames. While an OIII filter is fantastic for the eyepiece, avoid using heavy narrowband filters for this specific imaging technique. They cut too much incoming light and force your camera to use longer exposures, which smears the image and defeats the entire purpose of freezing the atmospheric turbulence.

Planetary nebulas handle magnification incredibly well because they have high surface brightness. Don't be afraid to push your eyepiece to its limit on nights with calm, steady air.

Monday, Sept. 21 — Caroline's Rose Cluster (NGC 7789)

Located in Cassiopeia, this rich open star cluster shows as a misty, ghostly patch of light against the Milky Way in binoculars. In an 8-inch or larger telescope, the cluster resolves into hundreds of faint stars. Trace the dark lanes winding through the stars, which give the impression of swirling rose petals.

This is a fantastic target for wide-field tracking shots. A small refractor or a 200 mm camera lens will capture the delicate, detached nature of the cluster beautifully against the background space.

Because the stars in this cluster are relatively faint, dark adaptation is critical. Avoid looking at your phone or any white light for at least 30 minutes before hunting for the "petals."

Tuesday, Sept. 22 — The Owl Cluster (NGC 457)

Also known as the ET Cluster, this is a phenomenal crowd-pleaser in Cassiopeia. Even small telescopes easily reveal the two bright "eyes," the outstretched "wings," and the "body" of the owl.

Take note of the colors. The brightest "eye" (Phi Cassiopeiae) is a distinctly yellow-white supergiant, contrasting with the blue-white hue of the other stars in the cluster.

It is an exceptionally easy and rewarding target for beginner astrophotographers using a tracking mount. Short exposures will capture the stick-figure shape perfectly without requiring heavy post-processing.

In space, there is no up or down. If the owl looks upside-down or sideways in your eyepiece, simply rotate your star diagonal or physically walk to the other side of your telescope until the bird is standing upright.

Wednesday, Sept. 23 — September equinox and zodiacal light (predawn)

Autumn officially begins in the Northern Hemisphere today. Because the exact moment of the equinox occurs just after midnight at 00:05 Universal Time on Sept. 23, it actually takes place on the evening of Sept. 22 at 8:05 p.m. EDT for North American observers.

On this day, the sun rises due east and sets due west. You can easily track this solar geometry in your own yard: simply place a stake in the ground and mark where its shadow falls exactly at noon today. If you do it again on the winter solstice in December, you will be able to tangibly track the shifting mechanics of our solar system as the midday shadow stretches much farther.

This perfect east-to-west trajectory also creates an opportunity to capture your own local "Manhattanhenge." The term comes from the famous phenomenon in New York City, where the setting sun aligns perfectly between the towering skyscrapers. Because the sun sets exactly due west on the equinox, any street, road, or geographic corridor in your town that runs perfectly east-west will have the setting sun drop directly down the center of the road. It makes for an incredibly striking time-lapse or composite photo, with the blazing solar disk perfectly framed by the buildings or trees on either side of your street.

The geometry of the ecliptic (the sun's path across the sky) during the autumn equinox also makes this prime time to hunt for the zodiacal light in the morning sky. During autumn mornings in the Northern Hemisphere, the ecliptic stands almost perfectly vertical against the eastern horizon. This steep angle pulls the zodiacal light — a massive, faint pyramid of glowing interplanetary dust reflecting sunlight — high into the dark sky.

To see this "false dawn," find a dark sky location far from city lights and look east about 90 minutes before the true sunrise. It will appear as a massive, ghostly white cone of light stretching upward from the horizon, unlike the true dawn, which stretches horizontally and often features reddish hues.

While hunting for the false dawn, you will easily spot a glaringly bright "star" higher in the east; that is Jupiter, serving as a perfect naked-eye preview for tomorrow morning's dedicated observing challenge.

Thursday, Sept. 24 — Jupiter enters Leo (predawn)

Look to the eastern sky before dawn to spot the undisputed king of the morning sky. Shining at a blazing magnitude -1.9, Jupiter is impossible to miss and will be by far the brightest point of light visible. On this exact date, the gas giant officially crosses the celestial boundary into the constellation Leo, where it will remain "parked" for the rest of the year.

To get the absolute best telescopic view, you are looking for a very specific, narrow observing window. You need to wait until Jupiter has climbed high enough above the eastern horizon to escape the turbulent "soup" of Earth's lower atmosphere, but you must catch it before the approaching sunrise paints the sky too bright. Your sweet spot is roughly 60 to 90 minutes before dawn. During this brief window, the atmospheric seeing conditions stabilize, giving you the sharpest possible views.

Because it is so piercingly bright, Jupiter cuts right through urban light pollution. If you mount a pair of binoculars on a tripod during this window, you can easily spot its four largest Galilean moons — Io, Europa, Ganymede, and Callisto—flanking the planet like tiny pinpricks of light. If you have a small telescope, push your magnification to 100x or more.

As that narrow predawn window closes and the sky begins to turn a pale blue, keep observing; the approaching daylight actually acts as a natural filter to cut the planet's intense glare, allowing you to clearly resolve the dark equatorial cloud bands stretching across its disk right up until the true dawn washes the sky completely.

Friday, Sept. 25 — Albireo, the autumn sapphire and topaz

With the moon sitting at a glaring 99% illumination tonight, faint deep-sky targets are completely washed out by the lunar glare. Instead, wait until early to mid-evening and look straight up near the zenith to find a target that easily cuts right through the scattered moonlight. To the naked eye, Albireo appears as a single, moderately bright star marking the "beak" of the constellation Cygnus (the Swan), which dominates the autumn sky as the backbone of the Northern Cross asterism.

When viewed through a small telescope at low magnification (around 30x to 50x), that single point of light instantly splits into one of the most stunning sights in the night sky. You will see a brilliant golden-yellow primary star paired intimately with a dimmer, vivid sapphire-blue companion. Because stars are concentrated point sources of light, their intense colors remain striking and sharp even when the surrounding atmosphere is flooded with bright moonlight.

If you are attempting to image this colorful pair, the biggest challenge is actually preventing your camera from capturing too much light. Because modern sensors are incredibly sensitive, standard exposure times will quickly overexpose the stars, blowing out their cores to pure white and entirely destroying the vivid topaz and sapphire saturation. Keep your exposures very short and your ISO or camera gain low to preserve those natural, contrasting hues.

A fantastic, counterintuitive trick for both visual observing and astrophotography is to deliberately knock your telescope slightly out of focus. When perfectly sharp, an intense pinpoint of light can sometimes overwhelm the color-detecting cone cells in your eye. By turning the focus knob just enough to swell the stars into small, soft disks, you spread the light out over a wider surface area on your retina — or across more pixels on your camera sensor — making the contrasting yellow and blue colors dramatically more pronounced.

Saturday, Sept. 26 — The full Harvest Moon

The Harvest Moon is arguably the most famous and widely celebrated lunar phase of the year. Earning its title by being the closest full moon to the autumn equinox, it features a fantastic orbital quirk. Because the ecliptic rests at a very shallow angle to the eastern horizon during autumn evenings, the moon rises only 20 to 30 minutes later each night instead of the usual 50 minutes. This geometry provides several consecutive evenings of bright twilight illumination right after sunset — a phenomenon that historically allowed farmers to work late into the crisp autumn nights bringing in the crops.

Because the sun is shining directly down onto the lunar surface from our perspective on Earth, there are no shadows along the terminator line to reveal the depth of the craters. Instead, a Full moon is the absolute best time to observe the dramatic lunar ray systems using binoculars or a small telescope. If you look at the brilliant crater Tycho in the southern hemisphere, you can clearly trace stark white streaks of pulverized rock splashed hundreds of miles across the darker lunar surface from the ancient, violent impact.

If you want to photograph the Harvest Moon, plan to catch it right as it clears the eastern horizon at sunset. The famous "moon illusion" makes the lunar disk appear massive when your brain compares it to distant, familiar horizon features like trees or buildings, making for incredibly dramatic landscape shots.

For those using a telescope, the sheer brightness of a fully illuminated moon can actually be physically uncomfortable to the eye. Thread a variable polarizing filter or a neutral density filter onto your eyepiece to act like sunglasses; this cuts the blinding glare and allows your eye to comfortably pick out the subtle, contrasting color variations hidden within the dark basaltic plains of the lunar seas.

Sunday, Sept. 27 — The twin diamonds of Aries

Even with a glaring waning gibbous moon still flooding the sky with light, you can easily hunt down one of the most beautiful and accessible double stars in the autumn sky. Because stars are concentrated pinpoints of light, they pierce right through the atmospheric lunar glare. Point your telescope toward the constellation Aries to find Gamma Arietis (also known as Mesarthim), a star system that a small telescope will easily split into two piercing "headlights."

What makes this pair so visually striking is their perfect symmetry. Unlike the contrasting colors of Albireo, both stars in this system are nearly identical in magnitude and spectral class. They appear as twin brilliant white diamonds separated by a comfortable 7.4 arcseconds, making them an easy and highly satisfying split for any small optic.

Because these stars are bright enough to cut through the moonlight, this is a fantastic opportunity for simple astrophotography. No tracking mount is required — you can simply hold a smartphone up to the eyepiece (or use a basic mount adapter) and use the camera's zoom function to capture the split pair. To truly appreciate the pure, icy white color of these A-type stars, try deliberately throwing your telescope slightly out of focus. Spreading their light into wider, softer disks across your retina makes their true color much more obvious to the eye.

Monday, Sept. 28 — A two-comet evening

This month, astronomers are tracking two comets returning to our evening skies: Comet 161P/Hartley-IRAS in Aquarius and Comet 10P/Tempel 2 farther south in Piscis Austrinus.

Both comets hover around a magnitude 9.5 to 10 (though their brightness predictions are highly uncertain). Should they remain bright they could be great targets for an 8-inch or 10-inch telescope. Because the 91% illuminated waning gibbous moon is lingering in the sky, you will want to wait until mid-to-late evening (around 10:30 p.m.) when both comets cross the meridian and reach their highest elevation in the south. This timing gets them as far above the murky atmospheric horizon "soup" as possible, though you will still be fighting significant lunar glare.

To combat the scattered moonlight, advanced observers can thread a specialized Swan Band comet filter (such as a C2 narrow-band filter) into their eyepiece; these isolate the specific carbon gas emissions of comets to help darken the background sky and boost the contrast of the faint, fuzzy comas. Comets are notoriously unpredictable; however — always check live observing reports, like the COBS (Comet Observation Database), before heading out so you know exactly what to expect.

If you have a tracking mount, this is the perfect opportunity to test your comet-tracking settings. Take multiple 30-to-60-second exposures. When stacking the images later, most astrophotography software will allow you to align on the comet's nucleus rather than the stars. This technique gives you a beautifully sharp comet anchored against a dramatic backdrop of trailing starlight.

Tuesday, Sept. 29 — Kemble's Cascade

Kemble's Cascade is a delightful asterism in Camelopardalis. While software databases often catalog the region under the open cluster NGC 1502, visual observers know it as a stunning, perfectly straight waterfall of more than 20 colorful stars tumbling down into a tiny "splash" pool — the open cluster NGC 1502 being located at its base.

In binoculars or a wide-field telescope, pan slowly up and down the cascade, and take note of the brightly colored, magnitude-5 orange star sitting right in the middle of the waterfall.

This asterism provides a fantastic composition for a DSLR mounted on a simple tripod or star tracker. A 50 mm or 135 mm lens frames the 3-degree-long cascade and the cluster perfectly.

This is a good example of the old saying, "less is more." Because Kemble's Cascade is an asterism (an alignment of unrelated stars created purely by perspective), if you use too much magnification, you will zoom right through it and lose the cascading shape completely. Always use your lowest power eyepiece to capture the full, flowing effect.

Wednesday, Sept. 30 — The moon visits the Pleiades

As September draws to a close, an 80% illuminated waning gibbous moon pays a visit to the iconic Pleiades (M45) open cluster. While this stellar nursery is normally a dazzling, easy sight through binoculars, tonight's viewing dynamic presents a unique and dramatic observation challenge. The intense lunar spotlight casts significant glare across the cluster, heavily washing out its faint blue reflection nebulosity.

Use this intense phase contrast as a fun visual challenge. Take a moment to look closely at the cluster and try to memorize or name its most prominent members: Alcyone, Maia, Electra, Taygeta, Merope, Asterope, and Celaeno, alongside their mythological parents Atlas and Pleione. See how many of these seven sisters you can consciously pick out before the lunar glare overwhelms your night vision.

If the gibbous moon becomes too overwhelmingly bright, use a simple field trick: position yourself so the edge of a house, a chimney, or a thick tree branch completely blocks the lunar disk from view, allowing you to observe the sparkling cluster in relative darkness.

If you are setting up a camera, try capturing a wide-field time-lapse sequence over several hours. Watching the moon's rapid orbital motion physically carry it across the sky relative to the fixed, glittering background stars of the Pleiades makes for a mesmerizing astronomical animation.

Skywatching terms

Gibbous: Used to describe a planet or moon that is more than 50% illuminated.

Asterism: A noteworthy or striking pattern of stars within a larger constellation.

Degrees (measuring the sky): The sky is 360 degrees all the way around, which means roughly 180 degrees from horizon to horizon. It's easy to measure distances between objects: Your fist on an outstretched arm covers about 10 degrees of sky, while a finger covers about one degree.

Visual Magnitude: This is the astronomer's scale for measuring the brightness of objects in the sky. The dimmest object visible in the night sky under perfectly dark conditions is about magnitude 6.5. Brighter stars are magnitude 2 or 1. The brightest objects get negative numbers. Venus can be as bright as magnitude -4.9. The full moon is -12.7 and the sun is -26.8.

Terminator: The boundary on the moon between sunlight and shadow.

Zenith: The point in the sky directly overhead.

Night sky observing tips

Adjust to the dark: If you wish to observe fainter objects, such as meteors, dim stars, nebulas, and galaxies, give your eyes at least 15 minutes to adjust to the darkness. Avoid looking at your phone's bright screen by keeping it tucked away. If you must use it, set the brightness to minimum — or cover it with clingy red film.

Light Pollution: Even from a big city, one can see the moon, a handful of bright stars, and the brightest planets — if they are above the horizon. But to fully enjoy the heavens — especially a meteor shower, the fainter constellations, or to see the amazing swath across the sky that is the disk of our home galaxy, the Milky Way — rural areas are best for night sky viewing. If you're stuck in a city or suburban area, use a tree or dark building to block ambient light (or moonlight) and help reveal fainter sky objects. If you're in the suburbs, simply turning off outdoor lights can help.

Prepare for skywatching: If you plan to be outside for more than a few minutes, and it's not a warm summer evening, dress more warmly than you think is necessary. An hour of winter observing can chill you to the bone. For meteor showers, a blanket or a lounge chair will prove to be much more comfortable than standing or sitting in a chair and craning your neck to see overhead.

Daytime skywatching: On the days surrounding the first quarter, the moon is visible in the afternoon daytime sky. At last quarter, the moon rises before sunrise and lingers in the morning sky. When Venus is at a significant angle away from the sun, it can often be spotted during the day as a brilliant point of light — but you'll need to consult an astronomy app to know when and where to look for it. When large sunspots develop on the sun, they can be seen without a telescope — as long as you use proper solar filters, such as eclipse glasses. Permanent eye damage can occur if you look at the sun for any length of time without protective eyewear.