117P/Helin–Roman–Alu

117P/Helin–Roman–Alu, also known as Helin-Roman-Alu 1, is a periodic comet in the Solar System. It is a Quasi-Hilda comet.[4]

117P/Helin-Roman-Alu
Discovery
Discovered byEleanor F. Helin
Brian P. Roman
Jeff Alu
Discovery dateOctober 2, 1989
Designations
1987 XXXVII
Orbital characteristics
EpochMarch 6, 2006
Aphelion5.123 AU
Perihelion3.037 AU
Semi-major axis4.08 AU
Eccentricity0.2556
Orbital period8.24 a
Inclination8.7080°
Last perihelion2022-Jul-07[1]
March 27, 2014[2]
December 19, 2005
Next perihelion2030-Nov-26[3]

References
  1. "117P/Helin-Roman-Alu Orbit". Minor Planet Center. Retrieved 2014-06-17.
  2. Syuichi Nakano (2011-04-06). "117P/Helin-Roman-Alu 1 (NK 2051)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-20.
  3. "Horizons Batch for 117P/Helin-Roman-Alu 1 (90001003) on 2030-Nov-26" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2023-07-06. (JPL#K222/63 Soln.date: 2023-Jul-06)
  4. 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.


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