27P/Crommelin
Comet Crommelin photographed by Ferdinand Quénisset on 28 October 1928 | |
| Discovery | |
|---|---|
| Discovered by |
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| Discovery date | 23 February 1818 |
| Designations | |
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| Orbital characteristics | |
| Epoch | 18 July 2011 (JD 2455760.5) |
| Observation arc | 193.92 years |
| Number of observations | 497 |
| Aphelion | 17.659 AU |
| Perihelion | 0.748 AU |
| Semi-major axis | 9.204 AU |
| Eccentricity | 0.91874 |
| Orbital period | 27.922 years |
| Inclination | 28.96° |
| 250.64° | |
| Argument of periapsis | 195.98° |
| Mean anomaly | 359.41° |
| Last perihelion | 3 August 2011 |
| Next perihelion | 27 May 2039 |
| TJupiter | 1.481 |
| Earth MOID | 0.229 AU |
| Jupiter MOID | 1.009 AU |
| Physical characteristics | |
Mean diameter | < 12±3 km |
| Comet total magnitude (M1) | 12.7 |
| Comet nuclear magnitude (M2) | 16.3 |
Comet Crommelin, also known as Comet Pons-Coggia-Winnecke-Forbes, is a periodic comet with an orbital period of almost 28 years. It fits the classical definition of a Halley-type comet with (20 years < period < 200 years). It is named after the British astronomer Andrew C. D. Crommelin who calculated its orbit in 1930. It is one of only five known comets that are not named after their discoverer(s) It next comes to perihelion (closest approach to the Sun) around 27 May 2039 when it will be near a maximum near-perihelion distance from Earth.