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  Summary: Comet 17P/Holmes shocked astronomers on Oct. 24, 2007, with a spectacular eruption. In less than 24 hours, the 17th magnitude comet brightened by a factor of nearly a million, becoming a naked-eye object in the evening sky. By mid-November the expanding comet was the largest object in the solar system--bigger even than the Sun. Since then, the comet has faded back to invisibility. A leading model of the blast posits a deep cavern of ice changing phase, from amorphous to crystalline, releasing in transition enough heat to cause Holmes to blow its top. The comet probably contains many such caverns so, one day, it could happen again. [ephemeris] [3D orbit]
  Photographer, Location Images Comments

Peter von Bagh,
Finland, Porvoo
Nov. 28, 2007
#1, #2

After a week of clouds it was nice to meet the comet again. You can easy find it with a binocular even on a lightpolluted backyardsky. Canon 400 EOS with a standard 18-55mm lens.

Paolo Berardi,
L'Aquila, Italy
Nov. 27, 2007
#1, #2

A color image and a particular graphic processing (b&w) that show actual asymmetric shape of comet Holmes. Image taken through Miniborg 45 refractor and Starlight Xpress SXV-H9 CCD camera from L'Aquila, a suburban area near centre of Italy.

Gunnar Glitscher,
Darmstadt, Germany
Nov. 25, 2007
#1, #2, more

By using solar eclipse glasses held towards the brilliant full moon the relative sizes of 17P and our natural satellite can seen on this F=18mm, 15 second exposure (ISO 800). Moonlight couldn't overwhelm comet Holmes' 3rd magnitude glow. I was surprised to see the 3 million km dust sphere quite easily with naked eyes.

Jo-Ann Kamichitis,
Fleetville, PA
Nov. 27, 2007

This is part of the holiday greeting that will be sent out to all members of the Lackawanna Astronomical Society. Images were taken on the dates shown on the graphic. We have been imaging the comet since Oct 25, 2007

Erno Berko,
Ludanyhalaszi, Hungary
Nov. 27, 2007

Very nice comet. Made with 100/600 APO refractor and Canon 350D. 7x180 sec exp. at ISO 1600.

Gary A. Becker,
Coopersburg, PA
Nov. 27, 2007
#1, more

Going, going, but not quite gone... Compare how Comet Holmes has increased in size and decreased in brightness in these two identically scaled images. Holmes was as voluminous as the sun in the November 11 image, but eight times the volume in the November 27 photo. Canon D40 images.

Mila Zinkova,
San Francisco, California, USA
Nov. 27, 2007
#1, more

Early morning today high clouds rolled in. Now I've got two obstacles to overcome - the Moon light and these clouds. Still the comet was bright enough to see and photograph not only the nucleus, but also the coma.

Tunç Tezel,
near Bolu, Turkey
Nov. 28, 2007

The Moon is in the wane, so the sky is a bit darker than a few days ago. With the help of a snowstorm, comet Holmes is easily visible again. Canon EOS 5D camera at ISO 800, 50 mm lens at f/2.8, 20 seconds of exposure. - Happy birthday SpaceWeather :)

P-M Hedén,
Vallentuna, Sweden
Nov. 27, 2007
#1, more

Amazing, during only a 60sec exposure with a 100mm ojective I captured four satellites around comet Holmes in Perseus and two of them crossed each other. Captured with a Canon Digital Rebel XT.

Geoff Chester,
Alexandria, VA, USA Washington, DC, USA Wayne, PA, USA
Nov. 24, 2007
#1, more

This is a sequence of images all made with the same equipment, an Antares Sentinel 80mm f/6 refractor and an Orion StarShoot Deep Space Color Imager CCD. The images are reproduced to the same scale. The 2007 NOV 24 image required "stitching" of two adjacent fields to span the comet's apparent diameter! The OCT 28 image was a composite of 60 4-sec. exposures made in my front yard in Alexandria, VA. The OCT 30 image was made at the U.S. Naval Observatory, Washington, DC, and is a composite of 60 5s exposures. The NOV 24 image is a composite of two stacks of 60 10s exposures, captured in Wayne, PA.

Jimmy Westlake,
Stagecoach, Colorado, USA
Nov. 26, 2007
#1, more

Before moonrise tonight, I snapped this image of Comet Holmes, a 122-sec guided exposure with a 300 mm Nikkor lens at f2.8. This was the first opportunity I have had to shoot the comet since the bright moon began interfering nearly two weeks ago. Still visible to the unaided eye in a clear, dark sky, the comet has swollen into a fuzzball considerably larger in angular size then the Moon. To emphasize this, I have inset an image of the waning gibbous moon taken tonight after moonrise with the same 300 mm lens. The bright star to the lower left of the comet is Mirfak (Alpha Persei) and the star cluster to the right of the comet is NGC 1245. Both images were taken with a Fuji Finepix S2 digital camera.

Jeff Greenwald,
Laramie, Wyoming, USA
Nov. 24, 2007

I'm sure you've seen enough photos of Comet Holmes but here's a series of photos taken between the two full moons to show the path that the comet has taken through Perseus. It would have been nice to get a photo every 2 or 3 days, but the weather doesn't always cooperate.

more images (Nov. 28-29): from Ari Koutsouradis of Westminster, MD; from Firat Barlas of Ankara, Turkey; from Terry Lutz of Plymouth, Ohio;

more images (Nov. 26-27): from Toni Scarmato of San Costantino di Briatico, Calabria, Italy; from Stanescu Octavian of Timisoara,Romania; from Sylvain Weiller of Saint Rémy lès Chevreuse, France; from Pavol Rapavy and Otto Posa of Rimavska Sobota, Slovakia; from Markus Weber of Trier, Germany; from John S. Gianforte of Durham, New Hampshire; from MENDONÇA JR of Stone Park VILA VELHA, BRAZIL;

more images (Nov. 24-25): from Philip L. Dombrowski of Glastonbury, CT; from Sid Leach of Scottsdale, Arizona; from Dan Chieppa of New Bedford, MA; from Paul Klauninger of Near Carp, Ontario, Canada;

more images (Nov. 22-23): from ALBERTO QUIJANO VODNIZA of Pasto, Nariño. Colombia; ;