22P/Kopff

22P/Kopff
14" reflector imaged on 2009-06-27
Discovery
Discovered byAugust Kopff
Discovery dateAugust 23, 1906
Designations
1906 Q1, 1919 O1
Orbital characteristics
EpochDecember 9, 2014
Aphelion3.446 AU
Perihelion1.559 AU
Semi-major axis3.467 AU
Eccentricity0.5433
Orbital period6.40 yr
Inclination4.737°
Last perihelionMarch 18, 2022[1]
October 25, 2015[2]
May 25, 2009[3]
Next perihelion2028-Jun-28[4]
Jupiter MOID0.077 AU (11,500,000 km)[5]
Physical characteristics
Dimensions3.0 km[5]

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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