161P/Hartley–IRAS

161P/Hartley–IRAS is a periodic comet with an orbital period of 21 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years).[6]

161P/Hartley-IRAS
Discovery
Discovered byMalcolm Hartley
IRAS
Discovery dateNovember 4, 1983
Designations
1984 III; 2004 V2
Orbital characteristics
EpochMarch 6, 2006
Aphelion14.19 AU
Perihelion1.275 AU
Semi-major axis7.734 AU
Eccentricity0.8351
Orbital period21.51 yr
Inclination95.6899°
Last perihelionJune 20, 2005
Next perihelion2026 Oct. 29[1]
2026 Nov. 27[2][3][4]
2026 December 18[5]

This was one of six comets discovered by the infrared space telescope IRAS, in 1983.[7][8]

References
  1. Syuichi Nakano (2005-06-21). "161P/Hartley-IRAS (NK 1184)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-18.
  2. "161P/Hartley-IRAS Orbit". Minor Planet Center. Retrieved 2014-06-18.
  3. Seiichi Yoshida (2006-07-16). "161P/Hartley-IRAS". Seiichi Yoshida's Comet Catalog. Retrieved 2012-02-19.
  4. "Horizons Batch for 161P/Hartley-IRAS on 2026-Nov-27" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 2022-06-22. (JPL#60 Soln.date: 2021-Apr-15)
  5. Patrick Rocher (2005-10-12). "Note number : 0132 P/Hartley-IRAS : 161P". Institut de mécanique céleste et de calcul des éphémérides. Retrieved 2012-02-19.
  6. "JPL Small-Body Database Browser: 161P/Hartley-IRAS" (2005-10-12 last obs). Jet Propulsion Laboratory. Retrieved 2012-07-26.
  7. Schmadel, Lutz D. (2007). "(3728) Iras". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 315. doi:10.1007/978-3-540-29925-7_3725. ISBN 978-3-540-00238-3.
  8. Marsden, B. G. (1986). "1986QJRAS..27..102M Page 102". Quarterly Journal of the Royal Astronomical Society. 27: 102. Bibcode:1986QJRAS..27..102M. Retrieved 2019-09-30.


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