| Discovery | |
|---|---|
| Discovered by | Grigory Neujmin |
| Discovery date | 24 February 1916 |
| Orbital characteristics | |
| Epoch | 31 December 1926 |
| Aphelion | 4.84AU |
| Perihelion | 1.338 AU |
| Semi-major axis | 3.089 AU |
| Eccentricity | 0.567 |
| Orbital period | 5.43yr |
| Inclination | 10.638° |
| Last perihelion | 11 May 2025?[1] (unobserved) |
| Next perihelion | 24 Feb 2031?[1] (Lost since 1927) |
25D/Neujmin, otherwise known asComet Neujmin 2, is aperiodic comet in theSolar System discovered byGrigory N. Neujmin (Simeis) on February 24, 1916.[2] It was last observed on February 10, 1927.[3]
It was confirmed byGeorge Van Biesbroeck (Yerkes Observatory,Wisconsin, United States) andFrank Watson Dyson (Greenwich Observatory,England) on March 1.[2]
A prediction byAndrew 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 alost 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.
| Numbered comets | ||
|---|---|---|
| Previous 24P/Schaumasse | 25D/Neujmin | Next 26P/Grigg–Skjellerup |
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