October 25, 2007
This comet's a comer
Click for larger image.
Stargazers are abuzz about a rowdy newcomer in the constellation Perseus, according to Sky and Telescope.
A distant comet that was as faint as magnitude 18 on October 20th has suddenly brightened by a millionfold, altering the naked-eye appearance of the constellation Perseus.
This startling outburst of Comet Holmes (17P) may be even stronger than the one that occurred 115 years ago, in November 1892, when the comet was first spotted by English amateur Edwin Holmes.
According to IAU Circular 8886, issued Wednesday October 24th by the Central Bureau for Astronomical Telegrams in Cambridge, Massachusetts, A. Henriquez Santana at Tenerife, Canary Islands, was the first to notice the outburst shortly after local midnight on the 24th. The comet was then about 8th magnitude, but within minutes Ramon Naves and colleagues in Barcelona, Spain, caught it at magnitude 7.3.
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Comet expert Gary Kronk expects this object to remain bright and grow from a starlike point to several arcminutes across over the next few nights as it makes its way slowly westward across Perseus. Its position on October 25th (0h UT) is right ascension 3h 53m, declination +50.1° (equinox 2000), and by October 30th it will have moved only to 3h 48m, +50.4°. For those living in the Northern Hemisphere, Perseus is visible all night at this time of year.
Update Thursday Oct. 25: "This object is amazing!" posted Brian Cudnik of Houston, Texas, on the Yahoo CometChasing group after coming in from his telescope on the evening of the 24th. "I have just observed it with an 8-inch f/10 Cassegrain, boosting the power up to 163x then to 508x.... The bright inner coma seems displaced off-center toward position angle 315°. The inner coma opens up into a fan toward position angle 300°, and I have noticed one ripple, akin to the hoods/ripples seen in Comet Hale-Bopp ten years ago. The coma is uniform in brightness, aside from this fan-shape material emanating from the central condensation, and has a well-defined edge." He measured the coma to be 69 arcseconds wide using using the drift method. "The entire object has a nice yellow-white color; no sign of any tail. The apparent magnitude is +2.8 (estimated using Mirfak at +1.9 and the other two bright stars adjacent to it at +3.0 each) and has remained rather steady all evening."
I'm guessing everything after "amazing" translates to something like, "Wow!"
Posted by Mike Lief at October 25, 2007 08:52 PM
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Comments
All true, NEO websites and comet tracking groups have been following the buzz for a couple weeks. I've been tasked by one group to image the object from LaLunasky Observatory in Ojai. Unfortunately, the full moon and So. Cal. fire smoke in the air made it impossible to image the last few nights. If not tonight, maybe Sunday....There's no indication this event is any threat to earth, but you never know.....
Posted by: Jeff at October 26, 2007 02:35 PM