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Today's Date: 12/18/2018 8:53:53 PM
Universal Time: 12/19/2018 1:53:53 AM

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17P/Holmes

17P/Holmes is a periodic comet in our solar system, discovered by the British amateur astronomer Edwin Holmes on November 6, 1892. In only 42 hours in October 2007, the comet brightened from a magnitude of about 17 to about 2.8. This represents a change of brightness by a factor of about half a million and is the largest known outburst by a comet.

On November 9, 2007 the coma, the thin dissipating dust ball around the comet, was found to be the largest object in the solar system, with a diameter greater than that of the Sun. (Though by Solar System standards, the mass of the comet is minuscule.)

As of February 2008, the comet remains visible, a challenging target at about magnitude +5 in the constellation Perseus. It has expanded to greater than 2 degrees of arc as seen from the Earth, and thus has very little surface brightness.

P17/Holmes  

Comet P17/Holmes

Taken on 10/30/2007
Single 30-second exposure
ISO 400

Equipment and Processing:

Orion ED80
Unmodified Canon RebelXT 350D
Processed with PhotoShop CS

Copyright © 2007 Antonio Pascarella
 
P17   Taken on 10/30/2007
Re-processed on 04/25/2012

Orion ED80
Unmodified Canon RebelXT 350D
5 30-second exposures
ISO 400
Stacked with DeepSkyStacker
Processed with Photoshop CS

Copyright © 2012 Antonio Pascarella

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