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Comet ISON


Comet ISON C/2012 S1

RA = 12h 47m 34s, Dec = -06deg 12min 22 sec

Date & Site:

Imaged on 11/14/13; Runningman Observatory, Carlsbad, CA

Imaged from 4:00 to 5:30 am


Telescope: Takahashi FSQ106 f/5 refractor

Mount: Losmandy G-11 with Gemini
Camera: ST-10XME; CFW10 with Astrodon filters;


Exposures: Nine 5-minute exposures (45 min) while guiding on a star and four 5-minute exposures (20 min) while guiding on the comet head. Imaged through a red filter (to reduce sky glow)

Processed by combining the two layers

When this image was taken, ISON was 95 million km from earth; estimated visual magnitude 6.3. The galaxy spotted in the upper left is NGC 4731, a 12th magnitude spiral galaxy in Virgo. Comet ISON was found to brighten from 8th to 6th magnitude just hours before this image was taken.

To see a 3-second animation (spanning 45 minutes of travel) click here 

Click here for a color image of Comet ISON from the Anza Borrego Desert on the morning of 11/02/13

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