161P/Hartley–IRAS

161P/Hartley-IRAS
Discovery
Discovered by	Malcolm Hartley IRAS
Discovery date	November 4, 1983
Alternative designations	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]

References

↑ Syuichi Nakano (2005-06-21). "161P/Hartley-IRAS (NK 1184)". OAA Computing and Minor Planet Sections. Retrieved 2012-02-18.
↑ "161P/Hartley-IRAS Orbit". Minor Planet Center. Retrieved 2014-06-18.
↑ Seiichi Yoshida (2006-07-16). "161P/Hartley-IRAS". Seiichi Yoshida's Comet Catalog. Retrieved 2012-02-19.
↑ Horizons output. "Observer Table for Comet 161P/Hartley-IRAS". Retrieved 2011-06-13. (Observer Location:@sun)
↑ 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.
↑ "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 @ aerith.net
161P at Kronk's Cometography

Comets

Features	Nucleus Coma Tails Antitail Comet dust Meteor shower

Types	Periodic Numbered Lost Halley-type Jupiter-family Encke-type Main-belt Non-periodic Hyperbolic Unknown-orbit Great Comet Sungrazing (Kreutz) Extinct Exocomet Interstellar

Related	Naming of comets Centaur Comet discoverers LINEAR Extraterrestrial atmospheres Oort cloud Small Solar System body Asteroid

Space missions	Comet Hopper CONTOUR CRAF Deep Impact/EPOXI Deep Space 1 Giotto Hayabusa Mk2 ICE Marco Polo Rosetta Philae Timeline Sakigake Stardust/NeXT Suisei Ulysses Vega program Vega 1 Vega 2 Vesta

Latest	C/2015 G2 (MASTER) C/2015 F5 (SWAN-XingMing) C/2015 F3 C/2014 Q2 (Lovejoy) C/2014 E2 (Jacques) C/2013 US10 (Catalina) C/2013 A1 (Siding Spring) C/2012 S4 (PANSTARRS) C/2012 K1 (PANSTARRS)

Culture and speculation	Antimatter comet Comets in fiction Fictional comets Comet vintages

Lists of comets (more)

Periodic
comets

Until 1985
(all)

After 1985
(notable)

Comet-like
asteroids

Lost

Recovered	11P/Tempel–Swift–LINEAR 15P/Finlay 17P/Holmes 27P/Crommelin 54P/de Vico–Swift–NEAT 69P/Taylor 72P/Denning–Fujikawa 80P/Peters–Hartley 97P/Metcalf–Brewington 113P/Spitaler 107P/Wilson–Harrington 122P/de Vico 157P/Tritton 177P/Barnard 206P/Barnard–Boattini 271P/van Houten–Lemmon 273P/Pons–Gambart 289P/Blanpain

Destroyed	3D/Biela 73P/Schwassmann–Wachmann D/1993 F2 (Shoemaker–Levy 9)

Not found	D/1770 L1 (Lexell) 5D/Brorsen 18D/Perrine–Mrkos 20D/Westphal 25D/Neujmin 34D/Gale 75D/Kohoutek 83D/Russell

Visited by
spacecraft

Non-Periodic
comets
(notable)

Until 1910	C/-43 K1 (Caesar's Comet) X/1106 C1 (Great Comet of 1106) C/1577 V1 (Great Comet of 1577) C/1652 Y1 C/1680 V1 (Great Comet of 1680, Kirsch's Comet, Newton's Comet)) C/1702 H1 (Comet of 1702) C/1729 P1 (Comet of 1729, Comet Sarabat) C/1743 X1 (Great Comet of 1744, Comet Klinkenberg-Chéseaux) C/1760 A1 (Great Comet of 1760) C/1769 P1 (Great Comet of 1769) C/1807 R1 (Great Comet of 1807) C/1811 F1 (Great Comet of 1811) C/1819 N1 (Great Comet of 1819) C/1823 Y1 (Great Comet of 1823) C/1843 D1 (Great March Comet of 1843) C/1847 T1 (Miss Mitchell's Comet) C/1858 L1 (Comet Donati) C/1861 G1 (Comet Thatcher) C/1861 J1 (Great Comet of 1861) X/1872 X1 (Pogson's Comet) C/1882 R1 (Great Comet of 1882) C/1887 B1 (Great Southern Comet of 1887) C/1901 G1 (Great Comet of 1901) C/1910 A1 (Great January Comet of 1910)

After 1910	C/1911 O1 (Brooks) C/1911 S3 (Beljawsky) C/1927 X1 (Skjellerup–Maristany) C/1931 P1 (Ryves) C/1948 V1 (Eclipse) C/1956 R1 (Arend–Roland) C/1961 R1 (Humason) C/1963 R1 (Pereyra) C/1965 S1 (Ikeya-Seki) C/1969 Y1 (Bennett) C/1970 K1 (White–Ortiz–Bolelli) C/1973 E1 (Kohoutek) C/1975 V1 (West) C/1980 E1 (Bowell) C/1983 H1 (IRAS–Araki–Alcock) C/1989 X1 (Austin) C/1989 Y1 (Skorichenko–George) C/1992 J1 (Spacewatch–Rabinowitz) C/1993 Y1 (McNaught–Russell) C/1995 O1 (Hale–Bopp) C/1996 B2 (Hyakutake) C/1997 L1 (Zhu–Balam) C/1998 H1 (Stonehouse) C/1999 F1 (Catalina) C/1999 S4 (LINEAR) C/2000 U5 (LINEAR) C/2000 W1 (Utsunomiya-Jones) C/2001 OG108 (LONEOS) C/2001 Q4 (NEAT) C/2002 T7 (LINEAR) C/2004 Q2 (Machholz) C/2006 A1 (Pojmański) C/2006 M4 (SWAN) C/2006 P1 (McNaught) C/2007 E2 (Lovejoy) C/2007 F1 (LONEOS) C/2007 K5 (Lovejoy) C/2007 N3 (Lulin) C/2007 Q3 (Siding Spring) C/2007 W1 (Boattini) C/2009 F6 (Yi–SWAN) C/2009 R1 (McNaught) C/2010 X1 (Elenin) C/2011 L4 (PANSTARRS) C/2011 W3 (Lovejoy) C/2012 E2 (SWAN) C/2012 F6 (Lemmon) C/2012 K1 (PANSTARRS) C/2012 S1 (ISON) C/2012 S4 (PANSTARRS) C/2013 A1 (Siding Spring) C/2013 R1 (Lovejoy) C/2013 US10 (Catalina) C/2013 V5 (Oukaimeden) C/2014 E2 (Jacques) C/2014 Q2 (Lovejoy)

After 1910 (by name)	Arend–Roland Austin Beljawsky Bennett Boattini Bowell Brooks Catalina C/1999 F1 C/2013 US10 Eclipse Elenin Hale-Bopp Humason Hyakutake Ikeya-Seki IRAS–Araki–Alcock ISON Jacques Kohoutek Lemmon LINEAR C/1999 S4 C/2000 U5 C/2002 T7 LONEOS C/2001 OG108 C/2007 F1 Lovejoy C/2007 E2 C/2007 K5 C/2011 W3 C/2013 R1 C/2014 Q2 Lulin Machholz McNaught C/2006 P1 C/2009 R1 McNaught–Russell NEAT Oukaimeden Pan-STARRS C/2011 L4 C/2012 K1 C/2012 S4 311P Pereyra Pojmański Ryves Spacewatch–Rabinowitz Siding Spring C/2007 Q3 C/2013 A1 Skjellerup–Maristany Skorichenko–George Stonehouse SWAN C/2006 M4 C/2012 E2 Utsunomiya–Jones West White–Ortiz–Bolelli Yi–SWAN Zhu–Balam

Category
Commons
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Periodic comets (by number)
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