22P/Kopff

22P/Kopff
	14" reflector imaged on 2009-06-27
Discovery
Discovered by	August Kopff
Discovery date	August 23, 1906
Designations
Alternative designations	1906 Q1, 1919 O1
Orbital characteristics
Epoch	December 9, 2014
Aphelion	3.446 AU
Perihelion	1.559 AU
Semi-major axis	3.467 AU
Eccentricity	0.5433
Orbital period	6.40 yr
Inclination	4.737°
Last perihelion	March 18, 2022; October 25, 2015; May 25, 2009
Next perihelion	2028-Jun-28
Jupiter MOID	0.077 AU (11,500,000 km)
Physical characteristics
Dimensions	3.0 km

Comet Kopff or 22P/Kopff is a periodic comet in the Solar System. Discovered on August 23, 1906, it was named after August Kopff who discovered the comet. The comet was missed on its November 1912 return, but was recovered on its June 1919 return and has been seen at every apparition since.^[3] Close approaches to Jupiter in 1938^[5] and 1943 decreased the perihelion distance and orbital period.^[6]^[7] 22P/Kopff’s last perihelion passage was 18 March 2022.^[1] On 13 July 2028 it will pass 0.353 AU (52.8 million km) from Earth.^[5]

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