25D/Neujmin

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]

25D/Neujmin
Discovery
Discovered byGrigory Neujmin
Discovery date24 February 1916
Orbital characteristics A
Epoch31 December 1926
Aphelion4.84 AU
Perihelion1.338 AU
Semi-major axis3.089 AU
Eccentricity0.567
Orbital period5.43 yr
Inclination10.638°
Last perihelion18 August 2019?[1]
12 March 2014?
(unobserved)
Next perihelion11 May 2025?[1]
(Lost since 1927)

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.

References
  1. Seiichi Yoshida. "25D/Neujmin 2". Seiichi Yoshida's Comet Catalog. Retrieved 2019-02-26.
  2. Kronk, Gary W. "25D/Neujmin 2". Retrieved 2018-02-26. (Cometography Home Page)
  3. "25D/Neujmin Orbit". Minor Planet Center. Retrieved 2019-02-26.
Numbered comets
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24P/Schaumasse		 25D/Neujmin Next
26P/Grigg–Skjellerup


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