35P/Herschel–Rigollet
35P/Herschel–Rigollet is a periodic comet with an orbital period of 155 years and an orbital inclination of 64 degrees. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years). It was discovered by Caroline Herschel (Slough, United Kingdom) on 21 December 1788. Given that the comet has a 155-year orbit involving asymmetric outgassing, and astrometric observations in 1939 were not as precise as modern observations, predictions for the next perihelion passage in 2092 vary by about a month.
| Discovery | |
|---|---|
| Discovered by | Caroline Herschel & Roger Rigollet |
| Discovery date | 1788-12-21 & 1939-07-28 |
| Designations | |
Alternative designations | 35P/1788 Y1, 1788II Herschel; 1939 O1, 1939 IX |
| Orbital characteristics | |
| Epoch | 1939-08-05 |
| Aphelion | 56.9 AU |
| Perihelion | 0.74 AU |
| Semi-major axis | 28.843 AU |
| Eccentricity | 0.974 |
| Orbital period | 155 yr |
| Inclination | 64.207° |
| Last perihelion | 1939-08-09 |
| Next perihelion | 2092-Feb-13 (MPC) 2092-Feb-17 (JPL) 2092 Mar. 16 |
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