|Discovered by||Coggia, Jerome E.|
|Discovery date||January 22, 1867|
|P/1980 L2, P/1942 V1, P/1867 B1, 38P|
|Orbital characteristics A|
|Semi-major axis||11.247 AU|
|Orbital period||37.72 yr|
|Last perihelion||December 5, 1980|
|Next perihelion||November 10, 2018|
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.
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.
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