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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

Günther Strauch,
Borken, NRW, Germany
Nov. 14, 2007

Now the dimension of the comet holmes is the same as the moon size. But only at the sky, but not in reality. Canon EOS 20D, Refraktor 100/1000mm, Comet Holmes 1600 ASA, 180 Secondes exposure

Mike Salway,
Central Coast, NSW Australia
Nov. 13, 2007
#1, #2, more

My view to the North is blocked by trees, so I hadn't seen Comet Holmes until Tuesday night, when we went up to Mangrove Mountain pony club for some dark sky time. The view to the North there was pretty good, but there were still trees which blocked about 4.5° up off the horizon. We got our first visual look at the comet through binos, and wow it was large, but diffuse at the same time. So here's Comet Holmes, at 12:40am 14th November at 5° altitude. Unfortunately trees still blocked most of the view, because the refractor is shorter off the ground than my height - so even though I could see it clearly while standing, the refractor could not. Anyway, the trees give it a bit of atmosphere.. I would've liked the comet to have cleared the trees but i'll take what I can. Images taken with the ED80 & 350D, guided with the DMK. The first 1 is a stack of 3 x 60s subs. The second shot is a single 90s exposure just before it went behind the club-house at the Pony Club. All @ ISO800. I'm not sure if i'll get the chance to image this again, but I'll certainly try and get out again to take some widefield shots.

Taeyeon Kim,
Wawoojungsa Temple, Youngin City Korea
Nov. 6, 2007
#1, #2

Canon 350D EFs 10-22mm lenz, f3.5 iso400, 90s exposure

Pete Lawrence,
Selsey, West Sussex, UK
Nov. 14, 2007

Here are two shots of Holmes showing the large coma on the right, so large that it now passes in front of many faint background stars in its apparent path across the sky. This path is taking it closer to Alpha Persei or Mirfak which is clearly shown in the image on the left.

Katy Stetson and John Stetson,
Falmouth, Maine
Nov. 10, 2007

My daughter's first impression of the comet was that it was a (celestial) jellyfish. When we processed this image, we were amazed at the number of stars that can be seen clearly through this translucent comet.

Marco Fulle,
Sistiana (TS) Italy
Nov. 12, 2007

On 12 November a blue ion tail about 4 degrees long was still well visible SSW of the huge grey dust coma. Photo details: 12 Nov 2007 20h30m-21h00m UT. 8 x 3min + 4 x 30 sec exposure. FujiS3 @ 800ISO. f=135mm f/2 @ f/2.8 field 5 x 5 degrees.

David Lee,
Victoria BC Canada
Nov. 13, 2007
#1, more

Tonight was the first clear night I was able to get out and image Comet Holmes. It was 2 degrees centigrade and it didn't take long for the equipment to frost up. Fortunately I was running with my new dew removal system that worked like a charm! When I looked in to the eyepiece I noticed how much the comet had enlarged and become much more diffuse. The head now has a beautiful "flame" appearance. Telescope: Televue NP101is 101mm/5.4 Sensor: Meade DSI Pro Exposure: 15 stacked exposures of 30 seconds using MaxDSLR; fine tuning using Adobe Photoshop CS2

Suresh Mohan,
Mahabalipuram, South India
Nov. 11, 2007

Canon 350D,ISO 400.20 exposures of one minute each stacked and aligned in images plus

Giancarlo Vignale,
Sanremo Italy
Nov. 14, 2007

17P/Holmes comet+Mirphak+satellite Pentax Sduf II Canon 20D modif. exp.120 secon. 800 asa 14 Nov. 2007 h 17:45 T.U.

Oleg Tuchin,
Samara, Russia
Nov. 11, 2007
#1, more

The snapshot is made by November 11, 2007 UT 16h. A telescope, diameter of 100 mm, F = 1000 mm. Canon 350D. 53 staff for 30 seconds is combined.

more images (Nov. 13-14): from Simone Bolzoni of Busto Arsizio, northern Italy; from Curatsu Mihai of Bucharest, Romania; from Chuck Hunt of Congress, Ohio; from Tamas Ladanyi of Veszprem city in Hungary; from Luca Basili of Rome - Italy; from George Varros of Mount Airy, Maryland USA; from Karl Kuehn of Greene, NY; from John S. Gianforte of Durham, New Hampshire; from Wade B Clark Jr of Northwest Washington State near Lyman; from ALBERTO QUIJANO VODNIZA of Pasto, Nariño. Colombia

more images (Nov. 11-12): from Alfredo Garcia Jr of Torrance, CA; from Roger Marical of Est Rouen, Normandy, France;