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Periodic comet with 8 year orbit From Wikipedia, the free encyclopedia
117P/Helin–Roman–Alu, also known as Helin-Roman-Alu 1, is a periodic comet in the Solar System. It is a Quasi-Hilda comet.[4]
Discovery | |
---|---|
Discovered by | Eleanor F. Helin Brian P. Roman Jeff Alu |
Discovery date | October 2, 1989 |
Designations | |
1987 XXXVII | |
Orbital characteristics | |
Epoch | March 6, 2006 |
Aphelion | 5.123 AU |
Perihelion | 3.037 AU |
Semi-major axis | 4.08 AU |
Eccentricity | 0.2556 |
Orbital period | 8.24 a |
Inclination | 8.7080° |
Last perihelion | 2022-Jul-07[1] March 27, 2014[2] December 19, 2005 |
Next perihelion | 2030-Nov-26[3] |
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