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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

Toni Scarmato,
San Costantino di Briatico, Calabria, Italy
Jan. 11, 2008
#1, more

Comet 17P/Holmes and Algol, coma estimed 100' and magnitude 3.5 to naked eye.

Mark Riddick,
Bodie Island Lighthouse, Outer Banks, North Carolina, USA
Dec. 27, 2007

Comet Holmes at Bodie Island Lighthouse (NC). This the image I had wanted to capture since late October, and thankfully it was still quite prominent when we took our Christmas vacation. Fuji S2 body, Nikkor 50mm lens at f/1.2, 20 second exposure at ISO 1600. The beacon was lit for 5 seconds of the 20 second exposure.

P-M Hedén,
Vallentuna, Sweden
Jan. 11, 2008
#1, more

I went to a church ruin, it was built by the wikings a 1000 years ago. Standing inside that church looking up into the sky and see the stars, planets and a comet felt really special. Carl Zeiss 75-300mm (2 images), Canon Digital Rebel XT on a triod.

Thorsten Boeckel,
Germany, Fuerstenfeldbruck
Jan. 10, 2008
#1, more

Comet 17P/ Holmes near the star Algol. 88 arcmin lenght x 74 arcmin breath is now the expansion of 17P/ Holmes. Despite the enormous widness of nearly 7,2 x 6,1 million kilometers the comet can be observed in dark areas surprisingly effordless with the naked eye. But near big towns the objekt gets really hard to observe. (estimated brightness 4,2 mag*). 9.1.08, Nikon 300mm, f4 ( 480 mm dig), Exp 2x 110 sec, ASA 800 Canon 20D,

Sebastian Voltmer,
Black Forest, Germany
Jan. 8, 2008
#1, more

Comet 17P/Holmes in the Milky Way, Mars, California Nebula, h+chi, Pleiades. Photo details: 17mm f4, Canon EOS 30D, 500 ASA, 4x60s exposure.

Paul Evans,
Larne, Northern Ireland
Jan. 5, 2008
#1, more

I got a bit of clarity this evening and took the mount outside - this was a lineup shot with a bit of help from a couple of passing satellites! Minolta Dynax 5D, 50mm f1.7 lens 30secs f2.5 ISO1600. Holmes itself is fading but still very much alive and moving in on Algol.

Hiroaki Ohno,
Japan. Fukushima City
Jan. 10, 2008
#1, #2, #3, more

The Holmes comet of the fascination which became big. Tonight, it took pictures of Holmes comet after a long time. It was composed of the same magnification before with the photography moon, and size was compared. on January 10, 2008, 10:20.UT. A photography photograph is checked before it and sent, too. Mars and a comet and the moon, as for composing it, on last October 31, the thing of the photography. A photography thing is the thing of the photography through the wire netting of focus on November 16. A comet is light, and then the state that it becomes big is understood as for it. It is an experience to begin by my astronomical observation in 50. (TS) refracting telescope. The focal distance 500mm. The exposure of the CanonEOS-40D (SEO-SP2) ISO 1250 comet is 2 minutes. Photography is Fukushima City.Suburb.

Peter von Bagh,
Porvoo, Finland
Jan. 4, 2008

The comet is now a dim spot in Perseus, but an easy target for an ordinary camera. You must not see the comet, just take a photo of Perseus.

more images (Jan. 11-12, 2008): from Mila Zinkova of San Francisco, California; from Jean-François LARUE of Nancy, Lorraine, France;

more images (Jan. 7-8, 2008): from Giancarlo Vignale of Sanremo Italy; from Jay Edwards of Maine, NY;

more images (Jan. 5-6, 2008): from Gordon Mackie of Thurso, Scotland; from Ugur Ikizler of Mudanya - Bursa / Turkey; from Donatas Tamonis of Labanoras, Lithuania; from Martin Mc Kenna of Maghera, Co. Derry, N. Ireland;

more images (Jan. 3-4, 2008): from C B Devgun SPACE of Nuh, Haryana, India