111P/Helin–Roman–Crockett

111P/Helin–Roman–Crockett is a periodic comet in the Solar System. It was discovered by Eleanor and Ron Helin on 5 January 1989 from images obtained on the 3rd and 4th of that month. It is a Jupiter family comet known for extremely close approaches to Jupiter being a Quasi-Hilda comet. During these approaches, it actually orbits Jupiter.[4] The last such approach was in 1976,[5] the next will be in 2071.[5] The Jovian orbits are highly elliptical and subject to intense Solar perturbation at apojove which eventually pulls the comet out of Jovian orbit for the cycle to begin anew.

111P/Helin-Roman-Crockett
Discovery
Discovered byEleanor F. Helin
Ron Helin
Brian P. Roman
Randy L. Crockett
Palomar Observatory (675)
Discovery dateJanuary 5, 1989
Alternative
designations		1988 XIII
Orbital characteristics A
EpochMarch 6, 2006
Aphelion4.607 AU
Perihelion3.474 AU
Semi-major axis4.041 AU
Eccentricity0.1402
Orbital period8.122 a
Inclination4.2326°
Last perihelionJanuary 30, 2013[1]
December 27, 2004[2]
Next perihelion2021-Jun-15[3]

Simulations predict such a cycle is unstable, the object will either be captured into an encounter orbit (e.g. Shoemaker-Levy 9) or expelled into a new orbit which does not have periodic approaches. This implies that 111P's orbit is recent within the past few thousand years. It fits the definition of an Encke-type comet with (TJupiter > 3; a < aJupiter).[6]

References
  1. Syuichi Nakano (2005-10-26). "111P/Helin-Roman-Crockett (NK 1271)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-24.
  2. Seiichi Yoshida (2011-07-22). "111P/Helin-Roman-Crockett". Seiichi Yoshida's Comet Catalog. Retrieved 2012-02-24.
  3. "111P/Helin-Roman-Crockett Orbit". Minor Planet Center. Retrieved 2014-06-17.
  4. Tancredi, G. (1990). "The capture of P/Helin-Roman-Crockett by Jupiter". Comptes-rendus de la table ronde: nouveaux développements en planétologie dynamique. pp. 273–279. Bibcode:1990ndpd.conf..273T.
  5. "JPL Close-Approach Data: 111P/Helin-Roman-Crockett" (2001-09-20 last obs). Retrieved 2012-02-24.
  6. "JPL Small-Body Database Browser: 111P/Helin-Roman-Crockett" (2001-09-20 last obs). Jet Propulsion Laboratory. Retrieved 2012-07-26.
Numbered comets
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110P/Hartley		 111P/Helin–Roman–Crockett Next
112P/Urata–Niijima
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