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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

Babak Tafreshi,
Fasham, Iran
Dec. 9, 2007
#1, more

Comet Holmes in a winter freezing mid-night of snow-covered Alborz mountains of Iran.

Günther Strauch,
Borken, NRW, Germany
Dec. 7, 2007

This evening it was possible to saw Comet Holmes between many clouds. With the naked eye the comet looks as a large, diffuse nebulae. I create a picture of the comet and of the galaxie in the constellation Anromeda (M31) to create a compare in the size and brightness. I create both pictures with a Canon EOS 20D, 800 ASA, 120 secondes exposure with a telephoto lens 135mm/3,5. Kind regards Günther

Nikolakakos Panagiotis,
Sparta Greece Europe
Dec. 6, 2007

gso 200/800 canon 350 d iso 800 288 sec.

Albert Sciesielski,
Waiblingen-Bittenfeld, Germany
Nov. 18, 2007

Comet Holmes mit Airplane, Canon EOS 350D, 18:10 MEZ, 15 s exposure, 1 600 ISO, 750mm Focal length

Mike Holloway,
Van Buren, Arkansas
Dec. 6, 2007

It is hard for me to picture just how big this comet has gotten. It took 6 frames with my 5" refractor and ccd camera to cover this area. I still had no sence of size so I have added a picture of the Moon or at least half a Moon at scaled size showing true size. Also shown is the cluster NGC 1245. This image from 2007/12/06

Amir Hossein Abolfath,
Shemshak, Tehran, Iran
Dec. 8, 2007

Holmes is bright enough still for naked eye observing and it seems like an egg on the sky. Canon 5D, 50mm Lens, ISO 1600, F/2.4, 14 sec

Toni Scarmato,
San Costantino di Briatico, Calabria, Italy
Dec. 6, 2007
#1, more

Comet 17P/Holmes continue his show in Perseus constellation, coma estimed 75' and magnitude steady at 2.7 to naked eye since the last nights. Fantastic the view in the sky with the comet, Andromeda, Double Perseus Open Cluster, Mars and Pleiades more to East. The sky was very clear and the seeing was optimal.

Philippe Moussette,
Parc des Laurentides Québec Canada
Dec. 8, 2007
#1, #2, more

The comet Holmes is more biggest of the moon and i took this image at foret momorency Québec Canada Whit 40 D canon camera at 3200 ISO and 100mm 400mm lent at f 5.6.

Slavko Stojanov,
Giza, near the great pyramids.
Nov. 16, 2007

A beautiful night-view of pyramids in Giza seen here with comet Holmes and Pleiades on the African sky. Night for a memory.

Tim Johnson,
La Canada Flintridge, CA
Dec. 5, 2007

The comet was still visible to the naked eye in light polluted suburban Los Angeles. Nikon D200. ISO 800. AstroPhysics 130mm refractor at f/4.5. Lumicon deep sky light pollution filter. Composite of three two minute exposures.

Ron Wayman,
Tampa Florida
Dec. 4, 2007
#1, #2

Holmes is getting very hard to photograph and even harder to see, if not at all, from city lights. I tried to find it and am not sure if I could see it in my 8x42 binoculars. It was very hard to see in a single image but I was able to bring it out a little after stacking a few images. Just out of curiosity I thought I would try to measure it's width and came up with over 50 arc minutes. It still looks very large in the surrounding star field.

Masa Nakamura,
Katsura, Ibaraki, Japan
Dec. 3, 2007
#1, #2

Comet Holmes is close to the Double Clusters of the Perseus. (1)Nikon 85mm(F1.4)+Nikon D70s (ISO1600) 90s-Exp. (2)Nikon ED400mm(F3.5)+ Nikon D70s (ISO1600) 120s-Exp.

more images (Dec. 8-9): from Alexander Gross of Kleinzell, Lower Austria, Austria; from Runar Sandnes of Reed, Norway; from Mila Zinkova of San Francisco, California, USA;

more images (Dec. 6-7): from Paolo Candy of Ci.A.O. Cimini Astronomical Observatory - Soriano - Italy; from Claudio Pincelli of Holyoke, Massachusetts; from ALBERTO QUIJANO VODNIZA of Pasto, Nariño, Colombia;

more images (Dec 4-5): from Ugur Ikizler of Mudanya - Bursa / Turkey; from Gianni Fardelli of Ascoli Piceno, Italy; from Paul Klauninger of Almonte, Ontario, Canada; from Andres Posada of Medellin, Colombia; from Giuseppe Di Carlo of L'Aquila (Italy); from P-M Hedén of Vallentuna, Sweden; from Rolando Ligustri remotely operating a telescope in New Mexico

more images (Dec. 2-3): from Chris Schur of Payson, AZ; from John R. Henley of Starfield Observatory, Nambour, Queensland, Australia; from Phillip Jones of McDonald Observatory, Ft. Davis, TX; from Giancarlo Vignale of Sanremo, Italy; from Marcel Clemens of Verona, Italy; from Alex Roca of Hortoneda, Lerida, Spain; from Ralph Ford of CA Hot Springs, CA; from John C McConnell of Maghaberry Northern Ireland;