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Discovered byGrigory Neujmin
Discovery date24 February 1916
Orbital characteristics
Epoch31 December 1926
Aphelion4.84 AU
Perihelion1.338 AU
Semi-major axis3.089 AU
Orbital period5.43 yr
Last perihelion18 August 2019[1]
Next perihelion11 May 2025[1]
(Lost since 1927)

25D/Neujmin, otherwise known as Comet Neujmin 2, is a periodic comet in the Solar System discovered by Grigory N. Neujmin (Simeis) on February 24, 1916.[2] It was last observed on February 10, 1927.[3]

It was confirmed by George Van Biesbroeck (Yerkes Observatory, Wisconsin, United States) and Frank Watson Dyson (Greenwich Observatory, England) on March 1.[2]

A prediction by Andrew Crommelin (Royal Observatory, Greenwich, England) for 1921 was considered unfavourable and no observations were made. The comet was recovered in 1926.[3] Searches in 1932 and 1937 were unsuccessful.[2]

Consequently, this comet has remained a lost comet since 1927. As of 2019 and using the JPL Horizons nominal orbit, the comet is still expected to come to perihelion around 1.3 AU from the Sun.


  1. ^ a b Seiichi Yoshida. "25D/Neujmin 2". Seiichi Yoshida's Comet Catalog. Retrieved 2019-02-26.
  2. ^ a b c Kronk, Gary W. "25D/Neujmin 2". Retrieved 2018-02-26. (Cometography Home Page)
  3. ^ a b "25D/Neujmin Orbit". Minor Planet Center. Retrieved 2019-02-26.

External links[edit]

Numbered comets
25D/Neujmin Next