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). It was discovered in January 1867, by Jérôme Eugène Coggia at Marseilles Observatory, France.
|Discovered by||Coggia, Jerome E.|
|Discovery date||January 22, 1867|
|P/1980 L2, P/1942 V1, P/1867 B1, 38P|
|Orbital characteristics A|
(near Uranus orbit)
(near Mars orbit)
|Semi-major axis||11.247 AU|
|Orbital period||37.72 yr|
|Last perihelion||November 10, 2018|
December 5, 1980
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. If this object did not have a coma and (for some definitions) had a perihelion beyond Jupiter's (5 AU), it would be considered a centaur.
- "JPL Small-Body Database Browser: 38P/Stephan-Oterma" (last observation: 1981-04-04; arc: 114.18 years). Jet Propulsion Laboratory. Retrieved 2009-05-07.
- Seiichi Yoshida (2004-07-31). "38P/Stephan-Oterma". Seiichi Yoshida's Comet Catalog. Retrieved 2011-10-23.
- "JPL Close-Approach Data: 38P/Stephan-Oterma" (last observation: 1981-04-04; arc: 114.18 years). Retrieved 2009-05-07.