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Title: 161P/Hartley–IRAS  
Author: World Heritage Encyclopedia
Language: English
Subject: Comets, IRAS catalogue objects, Antitail, Comet Ikeya–Murakami, C/1989 X1
Collection: Comets, Halley-Type Comets, Iras Catalogue Objects, Periodic Comets
Publisher: World Heritage Encyclopedia


Discovered by Malcolm Hartley
Discovery date November 4, 1983
1984 III; 2004 V2
Orbital characteristics A
Epoch March 6, 2006
Aphelion 14.19 AU
Perihelion 1.275 AU
Semi-major axis 7.734 AU
Eccentricity 0.8351
Orbital period 21.51 yr
Inclination 95.6899°
Last perihelion June 20, 2005
Next perihelion 2026 Oct. 29[1]
2026 Nov. 27[2][3][4]
2026 December 18[5]

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]


  1. ^  
  2. ^ "161P/Hartley-IRAS Orbit".  
  3. ^ Seiichi Yoshida (2006-07-16). "161P/Hartley-IRAS". Seiichi Yoshida's Comet Catalog. Retrieved 2012-02-19. 
  4. ^   (Observer Location:@sun)
  5. ^ Patrick Rocher (2005-10-12). "Note number : 0132 P/Hartley-IRAS : 161P". Institut de mecanique celeste et de calcul des ephemerides. 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. 

External links

  • Orbital simulation from JPL (Java) / Horizons Ephemeris
  • 161P/Hartley-IRAS – Seiichi Yoshida @
  • 161P at Kronk's Cometography
Periodic comets (by number)
161P/Hartley–IRAS Next
162P/Siding Spring

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