38P/Stephan–Oterma

38P/Stephan–Oterma
Discovery
Discovered by	Coggia, Jerome E.
Discovery date	January 22, 1867
Designations
Alternative designations	P/1980 L2, P/1942 V1, P/1867 B1, 38P
Orbital characteristics
Epoch	1981-Apr-26; (JD 2444720.5)
Aphelion	20.920 AU; (near Uranus orbit)
Perihelion	1.5744 AU; (near Mars orbit)
Semi-major axis	11.247 AU
Eccentricity	0.86002
Orbital period	37.72 yr
Inclination	17.981°
Last perihelion	November 10, 2018; December 5, 1980
Next perihelion	2056-Aug-28

38P/Stephan–Oterma (also known as Comet Stephan–Oterma) is a periodic comet with an orbital period of 38 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years).^[1] It was discovered on 22.9 January 1867, by Jérôme Eugène Coggia at Marseilles Observatory, France.^[1] On 25.86 January Édouard Stephan confirmed it was a comet. It was recovered in 6 November 1942 by the Finnish astronomer Liisi Oterma.^[4]

38P/Stephan–Oterma last came to perihelion on November 10, 2018.^[2]^[3] It was recovered by Pan-STARRS on June 24, 2017 while 5.3 AU from the Sun.^[2] The next perihelion passage is August 28, 2056.^[2]

Orbit

It has perihelion near the orbit of Mars and has aphelion near the orbit of Uranus. Acting like a centaur-hybrid, between the years 1982 and 2067, this object will make close approaches to the giant planets Jupiter, Saturn, and Uranus.^[5]

Comet 38P passing within 1.6AU of Uranus in 2067.^[5]

References

^ ^a ^b ^c ^d "JPL Small-Body Database Browser: 38P/Stephan-Oterma" (last observation: 1981-04-04; arc: 114.18 years). Jet Propulsion Laboratory. Retrieved 2009-05-07.
^ ^a ^b ^c ^d ^e MPC
^ ^a ^b ^c Seiichi Yoshida (2004-07-31). "38P/Stephan-Oterma". Seiichi Yoshida's Comet Catalog. Retrieved 2011-10-23.
^ "38P/Stephan-Oterma". cometography.com. Retrieved 5 February 2023.
^ ^a ^b "JPL Close-Approach Data: 38P/Stephan-Oterma" (last observation: 1981-04-04; arc: 114.18 years). Retrieved 2009-05-07.