Comet NEOWISE is making its closest approach to Earth. Here's how to see it live online.

The bright Comet C/2020 F3 (NEOWISE), which has garnered the attention of skywatchers around the world in recent weeks, will make its closest approach to Earth tonight (July 22).

At approximately 9:09 p.m. EDT (0109 GMT on July 23), Comet NEOWISE will reach perigee, or its closest distance to Earth. At that time, the comet will be 0.69 AU (astronomical units, or the average Earth-sun distance) away from Earth, according to NASA's orbit calculator. That's about 64.3 million miles, or 103.5 million kilometers. Shining with a magnitude of 2.2, the comet is currently about as bright as Polaris, the North Star, and can be observed in dark skies without the aid of a telescope or binoculars.

Skywatchers in the Northern Hemisphere will be able to spot the comet after sunset; it will be in the constellation of Ursa Major, just below the Big Dipper. And if you're unable to catch the naked-eye comet in the night sky during its close approach this evening, you'll have another chance to see the space rock in two live webcasts on Thursday (July 23).

This NASA sky map shows the location of Comet NEOWISE in the evening sky for viewers in the Northern Hemisphere in July 2020. (Image credit: NASA)

First, astrophysicist Gianluca Masi of The Virtual Telescope Project in Italy will stream live telescope views of the comet starting at 3 p.m. EDT (1900 GMT). You can watch it live here on Space.com, courtesy of The Virtual Telescope Project, or you can watch it on YouTube.

Later on Thursday, the Lowell Observatory in Flagstaff, Arizona will stream more live views of Comet NEOWISE in a webcast beginning at 11:30 p.m. EDT (0330 GMT on July 24). Hosted by Lowell Observatory director Jeff Hall and senior astronomer Dave Schleicher, the live discussion "will highlight the scientific importance of this 'dirty iceball' and how to view it," the observatory said in a statement. The Lowell Observatory's webcast will also stream live on Space.com, and on YouTube.

Astrophysicist Gianluca Masi of the Virtual Telescope Project captured this view of Comet C/2020 F3 (NEOWISE) on July 18, 2020. (Image credit: Gianluca Masi/The Virtual Telescope Project)

If you haven't yet had a chance to check out Comet NEOWISE for yourself, you'll want to get a look at it sooner rather than later, as the comet has been dimming slightly over the past few days. As it slowly fades from view, the naked-eye comet will soon require telescopes or binoculars to be seen and, after it disappears, it won't be back again in our lifetime. Because of its extremely long, elliptical orbit, the comet won't be back for another 6,800 years, NASA has said.

More: Comet NEOWISE: 10 big questions (and answers)

Astrophotographer Bill Dunford, a NASA social media specialist at the Jet Propulsion Laboratory in Pasadena, California, captured this view of Comet NEOWISE when it was visible in the predawn sky in early July 2020. (Image credit: NASA/Bill Dunford)

Comet NEOWISE is currently on the outbound leg of its trip through the solar system, having swooped around the sun on July 3. At its farthest distance from the sun, called aphelion, the comet will be about 715 AU (66 billion miles, or 107 billion km) away.

Editor's note: If you snap an amazing photo or video of Comet NEOWISE and would like to share it with Space.com for a possible story or gallery, send images and comments to spacephotos@space.com.

Email Hanneke Weitering at hweitering@space.com or follow her @hannekescience. Follow us on Twitter @Spacedotcom and on Facebook.

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Hanneke Weitering is a multimedia journalist in the Pacific Northwest reporting on the future of aviation at FutureFlight.aero and Aviation International News and was previously the Editor for Spaceflight and Astronomy news here at Space.com. As an editor with over 10 years of experience in science journalism she has previously written for Scholastic Classroom Magazines, MedPage Today and The Joint Institute for Computational Sciences at Oak Ridge National Laboratory. After studying physics at the University of Tennessee in her hometown of Knoxville, she earned her graduate degree in Science, Health and Environmental Reporting (SHERP) from New York University. Hanneke joined the Space.com team in 2016 as a staff writer and producer, covering topics including spaceflight and astronomy. She currently lives in Seattle, home of the Space Needle, with her cat and two snakes. In her spare time, Hanneke enjoys exploring the Rocky Mountains, basking in nature and looking for dark skies to gaze at the cosmos.