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]
| 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 | 18 August 2019[1] (unobserved) |
| Next perihelion | 11 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[update] and using the JPL Horizons nominal orbit, the comet is still expected to come to perihelion around 1.3 AU from the Sun.
References
edit- ^ a b Seiichi Yoshida. "25D/Neujmin 2". Seiichi Yoshida's Comet Catalog. Retrieved 2019-02-26.
- ^ a b c Kronk, Gary W. "25D/Neujmin 2". Retrieved 2018-02-26. (Cometography Home Page)
- ^ a b "25D/Neujmin Orbit". Minor Planet Center. Retrieved 2019-02-26.
External links
edit- Orbital simulation from JPL (Java) / Horizons Ephemeris
- 25D at Kronk's Cometography
- 25D at Kazuo Kinoshita's Comets
- 25D at Seiichi Yoshida's Comet Catalog
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