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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


Jan Koeman,
Kloetinge, The Netherlands
Nov. 15, 2007
#1, #2, #3, #4, more

For more than two weeks we are enjoying the beautiful view of magic fuzzball 17P Holmes from our backyard in the light polluted suburb of our village. Tonight I took a picture of the comet, my telescope and me, pointing with the laserpointer towards Holmes. I was just in time before clouds were covering our clear sky.


David Moth,
Weymouth, UK
Nov. 14, 2007
#1

A mosaic of Comet Holmes from the nights of 12/11/07 and 14/11/07 showing : a) further increase in size and b) direction of travel towards Mirfak - ie left to right. At current speed the comet should pass very close to Mirfak in about 3 days time. Images taken with 80mm telephoto zoom and SX MX5C camera - 5 x 3 minutes exposures each.

Mike Holloway,
Van Buren, AR
Nov. 10, 2007
#1, #2

Animation: Images from Nov. 2,4,5,6,8,9&10. 5x35 second images at about the same time each night through a blue filter. Images are stacked on the false center. 5" F4.2 530mm TV127is refractor and ST10 xmei ccd

Color photo: This is a RGBL image taken on Nov. 4th. The colors are varied with the faint blue ion gas being my favorite


Dean Smith,
Grand Forks, ND
Nov. 15, 2007
#1, more

I imaged Comet Holmes for six nights using an Olympus C-5000 camera afocal with a 9.25" Celestron SCT. I measured the size of the comet in each image and converted it to an actual size in miles using its current distance from Earth. A graph of diameter vs time shows a straight line with a slope of about 50,000 miles/day. The speed of the material would be half this, or about 1000 miles per hour. You can estimate the size of the dust cloud as diameter = (52,000 miles) * (days since Oct 23) This predicts the dust cloud to be bigger than the Sun by Nov 9.


Reza Amini Nejad,
Arak, Markazi, Iran
Nov. 13, 2007
#1

The comet 17/P Holmes is an incredible object yet.I taken those images by Canon 30D and i used the Meade 8" LX200R telescope. Then I edited with Adobe photoshope CS3.this image show that the size of moon and comet Holmes are nearly equal.


Robert Saint-Jean,
Saint-Bruno, Quebec, Canada
Nov. 13, 2007
#1

Several nights, several locations, several telescopes but one beautiful comet. Canon 300D on SW80ED, C 9 1/4 and LX200


Danilo Pivato,
Rome - Italy
Nov. 14, 2007
#1, more

Shots on the 2007.11.14 - 23h 14m U.T. Pentax SDUF II 400/4 + ccd ST-10XME Filter:LRGB exposed: 6x4x60 seconds The comet is to few more than 1° from Alpha Perseus (Mirfak)


Doug Zubenel,
My backyard near De Soto, Kansas.
Nov. 13, 2007
#1, #2

Seeing Tom Wagner's image got me to thinking of how colorful our backyard Oak trees are this fall, so I went outside and made this image. Canon Rebel XTi with a 50mm Nikkor lens @ f/5.6 when focused on the tree during the three seconds it took to open the shutter, fire the flash unit, and cover the lens. Then, the focus was shifted to infinity and the lens opened up to f/2.8, then the lens was uncovered for an additional 15 seconds before closing the shutter. ISO 800.


Jeanette Dunphy,
From my home near Kilcoy, Queensland, Australia.
Oct. 14, 2007
#1, more

I was imaging 17P/Holmes when a Taurid meteor went through the field of view, grazing the edge of the comet. This .gif is only 3 frames long. So happy I was using the Gstar-ex video camera at the time.


John Henley,
Starfield Observatory, Nambour, Queensland, Australia.
Nov. 13, 2007
#1, more

The comet was photographed through broken cloud just before midnight on November 13. It was ten degrees above the northern horizon. Canon 40D with Williams Optics FLT 110 on Paramount ME, 6 minutes at ISO 800.

more images (Nov. 15-16): from Simone Bolzoni of Busto Arsizio, Northern Italy; from Robert Cazilhac of Lugny, France;

more images (Nov. 13-14): from Mircea Radutiu of Bucharest, Romania, 'Amiral Vasile Urseanu' Observatory; from Ron Wayman of Tampa, Florida; from David Baldwin of Sussex, England; from Kyle W. Coker of Laguna Niguel, CA; from David Strange of Norman Lockyer Observatory, Devon UK; from Dave Miller of Norton Ohio, USA; from Lynn Paul of Doylestown, Ohio, USA; from Sean Davies of Revelstoke, British Columbia, CANADA; from John Pane of Marshall Township, PA; from Simone Bolzoni of Busto Arsizio, northern Italy.

more images (Nov. 11-12): from Brian Larmay of Coloma Wisconsin; from Richard Nolthenius of Santa Cruz, California, USA;

more images (Nov. 9-10): from Jim Leonard of Inyokern, California;

more images (Nov. 7-8): from Giuseppe Petralia of Mont. ETNA (Sicily);