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	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.

gollark: https://stats.osmarks.net/d/BS7IHP6Mk/cc-server?orgId=1&refresh=30s

gollark: After the californium incident, it got even worse. I have graphs as I bridged it to my metrics system with some convoluted code and ingame hardware.

gollark: Running a few small ones resulted in us all having to wear radiation shielded armour to avoid dying.

gollark: I have had much fun with nuclearcraft, but its reactors are unrealistically and irritatingly dangerous.

gollark: They're boring and don't even cause lethal radiation levels.

References

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.

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[aaa448_3_1191-1] 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.

[jrasc83_393-2] 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.