Quasi-Hilda comet

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A quasi-Hilda comet (QHC) is a Jupiter-family comet that interacts strongly with Jupiter and undergoes extended temporary capture by it. These comets are associated with the Hilda asteroid zone in the 3:2 inner mean-motion resonance with Jupiter. Typically, asteroids in this zone have a semimajor axis between 3.70 and 4.20 AU, eccentricities below 0.30, and inclinations of no more than 20°.[1] Comets can be temporarily perturbed into this group and then perturbed back out again.[2] Eight percent of the comets that leave the 3:2 resonance end up impacting Jupiter.[1]

Known quasi-Hilda comets[edit]

These numbered comets belong to the group of quasi-Hilda comet:[1]

Full Name
Aphelion (Q)
Eccentricity
Inclination
Perihelion date
36P/Whipple 5.27 0.261 9.92 2011-12-29
74P/Smirnova–Chernykh 4.78 0.147 6.65 2009-07-26
82P/Gehrels 4.65 0.122 1.12 2010-01-12
111P/Helin–Roman–Crockett 4.61 0.140 4.23 2013-01-30
117P/Helin–Roman–Alu 5.13 0.253 8.69 2014-03-28
129P/Shoemaker–Levy 4.85 0.170 3.29 2014-02-07
135P/Shoemaker-Levy 8 4.93 0.289 6.05 2014-11-01
147P/Kushida–Muramatsu 4.85 0.276 2.36 2008-09-22
215P/NEAT (2002 O8) 4.83 0.200 12.7 2010-06-06
228P/LINEAR (2001 YX127) 4.89 0.176 7.91 2011-08-26
231P/LINEAR-NEAT (2003 CP7) 5.01 0.246 12.3 2011-05-16
246P/NEAT (2004 F3) 5.17 0.286 15.9 2013-01-28

39P/Oterma was a quasi-Hilda before a close approach to Jupiter in 1963.[1] 77P/Longmore falls outside of the bulk distribution because of its large eccentricity and inclination.[1] Comet Shoemaker–Levy 9 impacted with Jupiter in 1994.

References[edit]

  1. ^ a b c d e Toth, I. (March 2006). "The quasi-Hilda subgroup of ecliptic comets - an update". Astronomy and Astrophysics 448 (3): 1191–1196. Bibcode:2006A&A...448.1191T. doi:10.1051/0004-6361:20053492. 
  2. ^ Spratt, Christopher E. (December 1989). "The Hilda group of minor planets". Journal of the Royal Astronomical Society of Canada 83: 393–404. Bibcode:1989JRASC..83..393S.