117P/Helin–Roman–Alu
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.
| Discovery | |
|---|---|
| Discovered by | Eleanor F. Helin Brian P. Roman Jeff Alu |
| Discovery date | October 2, 1989 |
| Designations | |
Alternative 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 March 27, 2014 December 19, 2005 |
| Next perihelion | 2030-Nov-26 |
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