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Spacewatch Friday: Comet Ikeya-Zhang Photo Gallery and Viewer's Guide

By Joe Rao
Special to SPACE.com
posted: 07:00 am ET
05 April 2002

Skywatcher reports

On the evening of March 22, Phillip J. Creed of Reinersville, Ohio drove 100 miles south to escape lake-effect clouds. He said the view of comet Ikeya-Zhang was "worth every mile."

Despite bright moonlight, Creed reported that the comet sported a 4-degree tail in 16x80 binoculars. (As a point of reference, the bright stars Pollux and Castor in Gemini, the Twins, are separated by four degrees.) "The first 2-degrees of the tail were especially bright, with a slightly filamentary appearance," Creed said.

Eric A. Jacobson, watching that same night from Mesa, Arizona concurred.
"Very nice," Jacobson reported. The comet "jumps right out at you through binoculars." He said it was gorgeous in a 6-inch Dobsonian telescope, even under a bright moon with Phoenix light pollution.

Even from metropolitan areas plagued by light pollution and the light of a full Moon, Ikeya-Zhang has managed to hold its own. Table -->


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   Images

SKY MAP: Where Ikeya-Zhang will be during April.

* Graphic made with Starry Night Software
 

CLOSE UP: Use the W of Cassiopeia to help you find Ikeya-Zhang throughout April.


Ikeya-Zhang's path around the Sun now through April.

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"This is a nice comet!" said Bob Post after viewing it on March 28. "I am twenty miles north of Center City Philadelphia, and 3 miles from Warminster to the west. So my skies are not dark. But this comet is a delight in 20x60 binoculars, and even with some thin clouds and a full Moon to my back, I could see nearly two degrees of tail."

And this, from Bob Benward of the Astronomical Society of Long Island: "Even from the light-polluted skies of Huntington, New York it is definitely a naked eye object."

Similar raves were coming in from other places around the globe.

On the evening of March 25, Fabio Zucconi of Lodi, Italy stated that although the sky wasn’t very good and the interfering moonlight was strong, "the comet was very bright."

William David Halbert reports that he saw the comet on March 29 from Ulm, Germany.

"Just got back from outside with this beautiful dirty snowball," Halbert said. "I used a pair of 14x70 binoculars and an Astroscan telescope and both views were wonderful. Though the binocs I could trace the tail out to 2.5 to 3 degrees. This is one lovely comet. As it got darker the tail just got easier and easier. I had quite a few 'visitors' who got out some 'oohs' and 'aahs' to pass around. I had the feeling that the nucleus was blue."

To the chagrin of residents in one half of the world, comet Ikeya-Zhang is too far north to be visible from the Southern Hemisphere. Yet another comet, LINEAR (C/2000 WM1), which briefly and unexpectedly flared to easy naked-eye brightness at the end of January, was only visible to viewers in the Southern Hemisphere.

Definitions

Degrees measure apparent sizes of objects or distances in the sky, as seen from our vantage point. The Moon is one-half degree in width. The width of your fist held at arm's length is about 10 degrees.

1 AU, or astronomical unit, is the distance from the Sun to Earth, or about 93 million miles.

Magnitude is the standard by which astronomers measure the apparent brightness of objects that appear in the sky. The lower the number, the brighter the object. The brightest stars in the sky are categorized as zero or first magnitude. Negative magnitudes are reserved for the most brilliant objects: the brightest star is Sirius (-1.4); the full Moon is -12.7; the Sun is -26.7. The faintest stars visible under dark skies are around +6.

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