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Philip Good's Astro Photos - Lunar, Planetary and Comets/Comet Holmes/17P - 10/31/2007

Philip Good's Astro Photos

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Comet Holmes/17P - 10/31/2007
Comet 17P/Holmes shocked astronomers on October 24/25th with a spectacular eruption, brightening almost a million-fold from 17th to 2.5th magnitude in a matter of hours.

This image was taken the night of October 31th, 2007, 11 PM local time, or 11/1/07 05:00 UT.

The image scale is 0.87 arcsec/pixel. At a distance of 1.62 AU I approximate the diameter of the coma to be about 800,000 Km, or almost 10 times the diameter of Jupiter! The diameter has doubled since my last image 3 days previous on 10/28/07.

In this photo it can be seen that the core is no longer centered in the coma and the coma has started to lose some of its circular shape.

Note that in this image North is directly to the right. The image on this page is approximately 1/2 scale, click on the image for a full-scale view.
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File information
Album name:goodp / Lunar, Planetary and Comets
Rating (2 votes):
Keywords:Comet Holmes
Telescope/Mount:Stellarvue SV115: 115mm at f14 with Televue 2X Powermate. Mountain Instruments MI-250 mount.
CCD:SBIG ST-10XME with Astrodon LRGB Filters
Image Details and Processing:15 minutes each LRGB in 1 minute subframes. Captured with CCDSoft, processed with CCDStack and Photoshop. Aligned on the comet nucleus for comet detail, then aligned with stars for star detail.
Date and Location:Denver, CO. October 31, 2007, 11 PM Local time.
File Size:1130 KB
Date added:Nov 02, 2007
Dimensions:2100 x 1400 pixels
Displayed:277 times
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