External links
- 25D/Neujmin at the JPL Small-Body Database
- 25D at Kronk's Cometography
- 25D at Kazuo Kinoshita's Comets
- 25D at Seiichi Yoshida's Comet Catalog
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| Discovery | |
|---|---|
| Discovered by | Grigory Neujmin |
| Discovery date | 24 February 1916 |
| Orbital characteristics | |
| Epoch | 31 December 1926 |
| Aphelion | 4.84 AU |
| Perihelion | 1.338 AU |
| Semi-major axis | 3.089 AU |
| Eccentricity | 0.567 |
| Orbital period | 5.43 yr |
| Inclination | 10.638° |
| Last perihelion | 11 May 2025? [1] (unobserved) |
| Next perihelion | 24 Feb 2031? [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 [update] and using the JPL Horizons nominal orbit, the comet is still expected to come to perihelion around 1.3 AU from the Sun.
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