Quasi-Hilda comet
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
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
- 1 2 3 4 5 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.
- ↑ 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.