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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


Peter von Bagh,
Porvoo, Finland
Nov. 20, 2007		 #1

After midnight the sky cleared up and the comet was an easy target in my suburban sky even without a telescope.


Alex Veles,
Main Astronomical Observatory, Kiev, Ukraine
Nov. 19, 2007		 #1, more

Photo details: Canon 30d in prime focus of Skywatcher 200mm f/5. Stack of 28 30sec frames with 800ISO and 1600ISO (about 15 min total exposure).


Derek Java,
Glens Falls, NY, USA
Nov. 18, 2007		 #1, more

Comet Holmes (appearing as "The Jellyfish!") has Mirphak in its tentacles!


Mila Zinkova,
San Francisco, California, USA
Nov. 20, 2007		 #1, more

Last night the comet was mostly washed up by the Moon light, but today early in the morning I was able to see her in all her celestial glory framed by the so Earthly trees from my backyard. The image was taken with Canon XTI, 55 mm Canon Lens, F5.6, ISO 1600 for 17"


John R. Henley,
Starfield Observatory, Nambour, Queensland, Australia
Nov. 19, 2007		 #1, more

Comet Holmes and the star Mirfak were imaged close to the northern horizon at 10 pm on November 19. The waxing gibbous Moon was high in the sky at the time. Canon EOS 40D and Williams Optics FLT-110 apo refractor on Paramount ME, 3 minutes at ISO 800.


Toni Scarmato,
San Costantino di Briatico, Calabria, Italy
Nov. 19, 2007		 #1, more

Comet 17P/Holmes and Mirphak, Canon 10D and 8cm refractor 15x30 sec exposure.


Alex Roca,
Hortoneda, Lerida, Spain
Nov. 18, 2007		 #1, #2, #3, #4

Sunday night comet was bisides alfa Perseo and we took this pictures. konica obj 135mm 200 ASA f 3.5 3 minuts and 5 minuts


Bob Thompson,
Prescott, Arizona, USA
Nov. 19, 2007		 #1

Canon 350D with 200mm telephoto at f/4.5, exposure 120 seconds. Guided piggyback on Meade LX200 telescope

Anthony Arrigo,
Park City, Utah
Nov. 18, 2007		 #1, more

Here we see just how big Comet Holmes has grown over the last couple of weeks. Both shots are through the same Astro Physics Starfire 160 at prime focus (1200mm @f/7.5). Images were previously processed using GIMP and then manually combined.


Patrice Arnaudet,
Frouville, France
Nov. 17, 2007		 #1, #2

Comet 17P Holmes magnifying and now swallowing Mirfak like a Pac Man game ! Canon 350D , zoom 200mm Tamron, 32X1 min exposure, 800 ISO on an eq5 mount.


Runar Sandnes,
Reed, Norway
Nov. 19, 2007		 #1, more

Comet 17P/Holmes vs Mirfak! Canon 20D, 800ISO 10x120sec + 4x180sec Televue 4" APO

more images (Nov. 20): from P-M Hedén of Vallentuna, Sweden;

more images (Nov. 18-19): from Dave Miller of Norton Ohio; from Geir Øye of Ørsta, Norway; from Martin Bernier of St-Liboire, Québec, Canada; from Terry Lutz of Plymouth, Ohio; from Rich Schueller of Chelmsford, MA; from Daisuke Tomiyasu of Kobe, Hyogo JAPAN; from Steve Smith of Chaparral, NM; from Ginger Mayfield of Divide, CO; from Salvador Martinez of BULLAS (Murcia) SPAIN; from Andreas Murner of Lake Chiemsee, Bavaria, Germany; from Bill Gucfa of Rehoboth, Massachusetts; from Paul Klauninger of Near Carp, Ontario, Canada; from Glen Wurden of Los Alamos, New Mexico; from Mike Borman of Evansville, Indiana;

more images (Nov. 16-17): from Andy Strappazzon of Belgium Gembloux; from Simone Bolzoni of Mottarone, Italy; from Eduardo Bertello S.G. of Mexico City; from Ralph Ford of California Hot Springs, CA; from Peter Rosén of central Stockholm - Sweden; from Eduardo Soares of Gramado, RS, Brazil; from Laurent Corp of Rodez, France;