44P/Reinmuth or Reinmuth 2 is a Jupiter-family comet that is greatly perturbed by the gas giant Jupiter.[2] The diameter of this comet is estimated at 3.22 km and its absolute magnitude at 11.[1]

Discovered byKarl Reinmuth[1]
Discovery date10 September 1947
1947 VII, 1954 VI, 1960 IX,
1974 VI, 1981 III, 1987 XXVI, 1994 XVII
Orbital characteristics A
EpochFebruary 17, 2013
Aphelion5.2693 AU[1]
Perihelion2.1161 AU[1]
Semi-major axis3.6928 AU[1]
Orbital period7.1 a[2]
Jupiter MOID0.52 AU
Dimensions3.22 km (2.00 mi)[1]
Last perihelion24 March 2015[3]
20 February 2001[3]
Next perihelion2022-Apr-23[4]


The LSW-Heidelberg where comet Reinmuth was discovered. The dome of the Bruce telescope is open

Reinmuth was discovered during a survey of small Solar System bodies with the 40 cm Bruce telescope at the LSW-Heidelberg Observatory in Heidelberg, Germany. The absolute magnitude of the comet was estimated by Karl Reinmuth to be 13, two orders of magnitude smaller than the current estimate.[2]
This comet was found to be a periodic comet by Leland E. Cunningham in Berkeley, California, who calculated an elliptical orbit with a 7.12-year orbital period. He also predicted that it would come to perihelion again on October 3, 1947. Later, this was revised to 6.59 years and August 19, 1947. The comet ended up reaching perihelion nearly one month after the expected date, and the calculations of its orbit was then refined further until the values were correct.[2]

Relationship with JupiterEdit

Orbit of 44P/Reinmuth. At aphelion, it gets very close to Jupiter, which alters its orbit.

Reinmuth makes many close approaches to Jupiter. These close approaches gradually change its orbit. For example, on July 16, 2003, comet Reinmuth came within 0.74 AU of Jupiter.[1] This increased its perihelion from 1.89 to 2.11 AU and its orbital period from 6.63 to 7.07 years.[2] On February 11, 2039, Reinmuth will come within 0.52 AU of Jupiter, which will raise its perihelion to 2.44 AU and its orbital period to 7.78 years.[2] On July 21, 2063 and March 1, 2146, Reinmuth will come 0.43 AU and 0.51 AU, respectively.[1] Close approaches like these could raise Reinmuth's perihelion until it ceases to become a comet.


  1. ^ a b c d e f g h i j "JPL Small-Body Database Browser: 44P/Reinmuth". Jet Propulsion Laboratory.
  2. ^ a b c d e f Kronk, Gary. "44P/Reinmuth 2". Gary W. Kronk's Cometography. Retrieved 2013-10-18.
  3. ^ a b Yoshida, Seiichi (April 29, 2013). "44P/Reinmuth". Retrieved 20 October 2013.
  4. ^ MPC
Numbered comets
44P/Reinmuth Next