Comet tail disconnected from 17/Holmes nucleus [by Thorsten Boeckel]
Comet 17P/Holmes gives us surprise again. The comet’s tail disconnected from the nucleus. It’s believed to be caused by gusts the solar wind which trigger magnetic storms around the comet. This phenomena is not rare, it happened on Comet Encke earlier this year.
Amateur astronomers are monitoring this comet each night. What about you? Since my last observation, the sky has been cloudy until now.
Below is the direct quote from SpaceWeather.com regarding the satellite of Holmes.
DOES COMET HOLMES HAVE A SATELLITE? Comet Holmes has erupted twice before, in Nov. 1892 and Jan. 1893. In 1984, great astronomer Fred Whipple proposed an explanation:
“An analysis of observations of comet P/Holmes 1892III’s two 8-10 mag bursts indicates that these phenomena are consistent with the grazing encounter of a small satellite with the nucleus on November 4.6, 1892, and the final encounter on January 16.3, 1893. While after the first burst the total magnitude fell less than 2 mag from November 7 to 30, the fading was much more rapid after the second burst. It is suggested that the grazing encounter distributed a volume of large chunks in the neighborhood of the nucleus, maintaining activity for weeks.” Source: Icarus (ISSN 0019-1035), vol. 60, Dec. 1984, p. 522-531.
Whipple’s idea might be updated circa 2007 to include a swarm of orbiting debris produced by, say, a previous collision. From time to time a debris-fragment might hit the comet’s nucleus causing a new outburst. It’s possible: Asteroids have satellites, so why not comets? Furthermore, fragments going around a comet’s irregular nucleus would have unstable orbits; from time to time they would naturally crash into the comet or fly off into space.
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