27P/Crommelin

27P/Crommelin
Discovery
Discovered by	J.-L. Pons
Discovery date	February 23, 1818
Designations
Alternative designations	1818 D1, 1873 V1, 1928 W1, 1956 S1
Orbital characteristics
Epoch	July 18, 2011
Observation arc	84 years (1928-2012)
Number of; observations	392
Aphelion	17.660 AU
Perihelion	0.748 AU
Semi-major axis	9.204 AU
Eccentricity	0.919
Orbital period	27.9 yr; 27 y 10 m 2 d (perihelion to perihelion)
Inclination	28.96°
Last perihelion	August 3, 2011; February 20, 1984
Next perihelion	May 27, 2039

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 four comets not named after their discoverer(s), the other three being Comets Halley, Encke, and Lexell. It next comes to perihelion (closest approach to the Sun) around May 27, 2039 when it will be near a maximum near-perihelion distance from Earth.

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[MPC-1] MPC

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