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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

Sean Walker,
MASIL East Observatory, Chester, NH
Nov. 10, 2007

Though expanding every day, Comet Holmes is becoming dimmer, and long exposures reveal the disconnected ion tail is not re-forming.

Daniele Gasparri,
Perugia, Italy
Nov. 8, 2007
#1, more

Mosaic of 5 images taken with an achromatic refractor 80-400 and CCD camera ST-7XME with schott BG38 filter. Total exposures: 5 hours

Tom J. Martinez,
Astronomical Society of Kansas City's Dark Sky Site near Butler, Missouri, USA
Nov. 8, 2007

These are 2 images of comet Holmes taken right around midnight 24 hours apart, Nov. 8 and Nov. 9. The blue ion tail changes quite a bit from night to night. This is one nice comet! Taken with a Canon XTi, 10 images of 10 minute exposures with a 300mm f/4 lens at ISO 1600.

Salon de Provence FRANCE
Nov. 9, 2007

Evolution of the plasma tail from 9 till 11 November 2007 EOS350D F200MM

Lorenzo Comolli,
Bogli, Appennines, Italy
Nov. 10, 2007
#1, #2, more

The comet lost the tail while approaching to Mirfak, Alfa Persei. The blue tail is quite long and exceed the field of vew, more than 2°. The dust coma is 16' wide and 23' long (in the sunward direction). The gas coma is 32'x43'. Tech details: Pentax 75 apo refractor (dia 75mm, 500mm focal length), Canon EOS 350D, 10 November 2007 h 19.24 UT. Total exposure 1.5 h. Location: Bogli, Appennines, Italy

John Wunderlin,
Empire Ranch Observatory, Mineral Point, Wi, USA
Nov. 10, 2007
#1, more

Imaged Comet Holmes Nov 10, 07:00UT. The first image is a stack of 14 30 second images. The second is a 10 minute exposure. The 3rd is a processed image to highlight the shape of the tail. All 3 images are at the same image scale.

Beom-Young Shin,
Hwachon, Gangwondo, Korea
Nov. 8, 2007
#1, #2, more

Photo details Optics: Takahashi FSQ106 Mount: Astro-Physics 1200GTO(German quatorial) Camera: SBIG STL-11000M Filters: SBIG Standard LRGB. Dates: 2007.11.8 KST Location: Byulmanse Observatory, Korea Exposure Data: LRGB = 50:15:15:15 minutes. (-30°C)

Bill Williams,
Chiefland Astronomy Village Chiefland, Florida 32626
Nov. 7-9, 2007
#1, #2

These two images of Comet Holmes taken two days apart (Nov.7&9) show striking architectural differences in the comet nucleus and environs depending on whether the tail was bright and attached (#1) or dteached and fainter (#2). A bright jet following the nucleus can be seen in image SW1 whereas there is no jet in image SW2 which has a small faint nucleus following the tail detachment. These images are both 1.5 hour total RBG exposures through a 6-inch EDF Astro-Physics refractor using and SBIG STL-11K CCD camera. Short exposures of the coma showing interior detail were layer masked in to the long exposures using Adobe Photoshop. These are the first images taken from my new observatory.

more images (Nov. 12-13): from Iliyan Darganov and Borislav Petrov of Varna, Bulgaria; from Yenal Ogmen of Green Island Observatory, Gecitkale, North Cyprus; from Eugen Kamenew of Philipps University Marburg, Hessen, Germany; from Jason Snyder of N. Las Vegas, NV; from Bart Firth of Dawsonville, New Brunswick, Canada; from Tim Caruk of St John's, Newfoundland, Canada; from ALBERTO QUIJANO VODNIZA of Pasto, Nariño. Colombia;

more images (Nov. 10-11): from Claudio Pincelli of Holyoke, Massachusetts; from Jim Hung of Taichung,Taiwan; from Masa Nakamura of Tochigi, Japan; from Jay Edwards of Maine, NY; from Konstantinos Christodoulopoulos of Korinthos, Greece; from Des Williams of St.Helens, Merseyside, England; from Jean-Marie Biets of Wilderen, Belgium;

more images (Nov. 6-7): from Bob Kelly of Ardsley High School, Ardsley, NY;