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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,
Niasar, kashan, Iran
Nov. 16, 2007
#1, more

Comet Holmes is now very close to Mirphak, the birghtest star of Perseus. Here in this wide view the comet is shown over the 1600-year old fire temple of Niasar in Iran, used for centuries by Zorostrians.

Masa Nakamura,
Tochigi, Japan
Nov. 17, 2007
#1, #2

Have you ever wondered how they look like if Comet Holmes comes over M45? How do you like Comet holmes close to the half moon? These are trick photos! D250mmf1200mmReflector+Nikon D70s (Iso1000), 60s Exposure.

P-M Hedén,
Vallentuna, Sweden
Nov. 17, 2007
#1, #2, more

Comet Holmes meets Mirphak and makes a beautiful couple in the sky. And Holmes is still bright in the sky, I photographed the comet beside a windmill in the dusk, no astronomical darkness. Orion 80ED @ 600mm f/7.5 and a Canon Digital Rebel XT.

Friedrich Deters,
LaGrange, North Carolina, USA
Nov. 17, 2007

Its getting to the point were I'm having difficulty seeing the comet with my naked eyes, but I still manage to photograph it! This one was from last night using the Canon Rebel XT, 200mm lens with 1.7X Teleconverter, 800 ISO, 17.5 minute exposure. The bright star is Mirfak (alpha Perseus)

Amir Kalbasi,
Hatta, Dubai, UAE
Nov. 16, 2007
#1, #2, #3

During our trip to Hatta Deserts I took these images of the Holmes comet. This is an amazing comet which one will never forget and it is growing fast!

Rolando Ligustri,
from Talmassons (UD) ITALY
Nov. 16, 2007
#1, more

I hope can interest you, the movement of the comet is seen within 4 days, while it is drawing near to the star Mirphak. at the same time the increase of the diameter and the change of aspect it is also noticed, becoming more and more evanescent. apo TV 101/540 ccd SXVM25C 6x10min

Thorsten Boeckel,
Fuerstenfeldbruck, Germany/Bavaria
Nov. 17, 2007
#1, #2, more

The expansion of 17P/ Holmes measures now 35 arcmin, and is visual archiving more the the moon (30,5').The diameter reaches up to 2,5 million kilometers. 17P/Holmes is dimming (may 3,2 mag), but it is no problem to see the the expansion wave with the naked eye. By using normal binoculars it is together with the "Perseus star" Mirfak a real magic view. Nikon 300mm x2 conv (960 mm,dig)f8, 2x 120sec, ASA 800, Canon 20D , 0:30 UTC

Tim Caruk,
St John's, Newfoundland, Canada
Nov. 15, 2007

Evidence of a tail can still be seen near the core of Holmes. The comet is fading a little in brightness but is now about the size of the sun. I made this image on the early morning of Nov 15 by combining several images made with a Canon digital SLR and a 8 inch Celestron.

Ugur Ikizler,
Mudanya - Bursa / Turkey
Nov. 16, 2007

Canon Rebel XT Sigma APO 70-300 ( 300 mm ) f/5,6 ISO 400 28 x 30 sec exposure

more images (Nov. 16-17): from Luca Basili of Rome - Italy; from Domenico Licchelli of Gagliano del Capo, Italy; from Farrell Germann of Jefferson City, MO; from Helmut Groell of Moers, Germany; from Michal Zolnowski-Tiamat of Solaris Observatory; from Fabio Damonte of Ronchi dei Legionari, Italy; from Mike Borman of Evansville, Indiana; from John S. Gianforte of Durham, New Hampshire; from Enrico Perissinotto of Premariacco - Udine - Italy; from Malcolm Park of London, UK; from David Cash of Manchester England; from David Harvey of Tucson, Arizona USA; from Jamie Cooper of Northampton, UK;

more images (Nov. 14-15): from Sheri Barrington of Weymouth, Dorset, UK; from Albert Engert of Uengershausen, Bayern, Germany; from Roberto Garofalo & Fabrizio Marchi of Pio X° OBSERVATORY - TREVISO - ITALY; from Gerald DeShirlia of Wimberley, Texas; from Marek Nikodem of Niedzwiady Observatory, near Szubin, Poland

more images (Nov. 12-13): from Philippe Moussette of Cap-Rouge Québec Canada;