17P/Holmes As Big as the Moon!

November 13th, 2007 by Chris

Well actually, the visible debris field is much larger than Jupiter, but this image shows that it is visually as large as the moon. The full moon subtends almost exactly 1/2 degree of the sky. The inner orange circle (overlay from HNSKY*) is also 0.5 degrees.

How cool is that? From a little speck of space debris to a cloud of debris that’s this huge in about 2 weeks.

17P/Holmes, 13 November 2007

Excuse the wiggles in the long exposure (seen on the brighter stars), my setup was a bit weak tonight because all of the neighbors had their porch lights on. I was forced into a pretty non-optimal location for placing the tripod. The jiggle is probably mostly due to the shutter opening and closing causing the camera to move. This is a 10 second exposure at f/2.8, 200mm, 1600 ISO.

* HNSKY is a fairly powerful, but somewhat clunky free home sky/planetarium software. If it had a bit more intuitive user interface this program would rock. It is highly expandable though and it’s pretty hard to complain for the price.

One Response to “17P/Holmes As Big as the Moon!”

  1. Heidi Says:

    I can’t believe I haven’t had the kids (especially Emily) out to see the comet at all yet. We’re going to miss our chance. *sigh* Need to make this a priority some evening this week. What time does it rise in the sky?

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