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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

Paolo Candy,
Cimini Astronomical Observatory - Soriano - Italy
Dec. 1, 2007
#1, more

The "Jellyfish Comet" traps many small fishes in NGC 1245. What a surprise this large fading coma! Excellent night-sky.

John Stetson,
Falmouth, Maine
Nov. 28, 2007

Our moon, 112307, angular diameter 32 arcminutes; Comet Holmes, 112807, angular diameter approx. 40 arcminutes; Comet Holmes and our moon layered together so that their relative sizes might be compared

Milan Gucic,
Belgrade, Serbia
Dec. 1, 2007

Can this comet just go away? No! It's so expanded now that I couldn't frame it in a medium sized refractor. Lights from Belgrade's two and a half million people are nothing compare to this comet.

Jan K. Qvam,
Horten Natursenter, Horten, Norway
Dec. 2, 2007

Comet 17P/Holmes-November 02; Coma diameter almost 50 arcmin ! 50sec. exposure ,Photometric V filter,102mm Refractor f9, SBIG STL1301 CCD Camera. FOV~75 x 60 `. (Doing photometry on this Comet (m1) requires a larger FOV).

Paul Walker,
Middlebury, Vermont, USA
Dec. 1, 2007
#1, #2

The Comet Holmes image is a stack of 11, 2 minute exposures taken 2007-12-01. ISO 1600, 500mm focal length. Canon Rebel XTi camera. 4" f/5 refractor. Contrast enhanced (histogram stretch). Some of the glow around the bright star is due to thin clouds passing through during some of the exposures. Moon comparison shot was taken the 18th of November with the same equipment.

Mila Zinkova,
San Francisco, California, USA
Dec. 1, 2007
#1, #2, more

Tonight I wanted to frame the comet inside a satellite dish at my house. The tree branches were on the way and too close to put them in the focus. The image I've got is kind of abstract. Later on the clouds rolled in and I had no need to look for any other frame for the night beauty . The images were taken with Canon XTI, 75 mm lens ISO 1600, exposure 17" F4.5

Richard Bell,
Kalamazoo, Michigan
Nov. 30, 2007
#1, more

I haven't been able to image Comet Holmes in a month thanks to Michigan weather and moonlight (mostly the weather). Finally got my chance on Nov. 30 and was happy to see that Holmes was still visible to the unaided eye. Braving temperatures in the mid-teens was necessary to capture this image. Pretty sure it was worth it! The image was taken with a Canon 300D and a Tele Vue Pronto. It's a 45 minute exposure (15 x 3 minutes each) at ISO 400.

Runar Sandnes,
Reed, Norway
Dec. 2, 2007
#1, more

After several days with dense frosty fog, the skies suddenly cleared for aprox. 15 minutes. I got 2 exposures of 2 min before the fog rolled in again. It was enough to capture the glory of the "foggy" comet. Still going strong, and in fact quite easy to see with the bare eye. Almost like M31, but a bit more definition. It is, still, a naked-eye-object! Canon 20D, Tele Vue 4" Renaissance SDF, 800 ISO, 2x120 sec.

more images (Dec. 2-3): from Luca Basili of Rome - Italy;

more images (Nov. 30 - Dec. 1): from Joni Virtanen of Kokkola, Finland; from Terry Lutz of Plymouth, Ohio; from Alan C Tough of Elgin, Moray, Scotland; from Toni Scarmato of San Costantino di Briatico, Calabria, Italy; from Stephane Palfray of Etainhus, Normandy, France; from James Willinghan of Marriottsville, Maryland; from Jo-Ann Kamichitis of Fleetville PA; from Ehsan Rostamizadeh of Sirch, Kerman, Iran; from Claudio Pincelli of Holyoke Massachusetts; from Fabiano B. Diniz of Sao Luis do Puruna, state of Parana, Southern Brazil; from George Varros of Mount Airy Maryland; from Amir Hossein Abolfath of Boin Zahra, Iran;

more images (Nov. 28-29): from Salvador Martinez of BULLAS (Murcia) SPAIN; from Alex Lloyd-Ribeiro of Durham, UK; from John Pane of Marshall Township, Pennsylvania, USA; from Alex Roca of Hortoneda, Lerida, Spain;