| Discovery | |
|---|---|
| Discovered by | Grigory Neujmin |
| Discovery date | 24 February 1916 |
| Designations | |
| D/1916 D1 D/1926 V2 | |
| |
| Orbital characteristics [1] | |
| Epoch | 21 March 1927 (JD 2424960.5) |
| Observation arc | 10.94 years [2] |
| Number of observations | 116 [2] |
| Aphelion | 4.840 AU |
| Perihelion | 1.338 AU |
| Semi-major axis | 3.089 AU |
| Eccentricity | 0.56682 |
| Orbital period | 5.429 years |
| Inclination | 10.639° |
| 328.72° | |
| Argument of periapsis | 193.70° |
| Mean anomaly | 11.577° |
| Last perihelion | 11 May 2025? [3] (unobserved) |
| Next perihelion | 24 Feb 2031? [3] (Lost since 1927) |
| TJupiter | 2.932 |
| Earth MOID | 0.350 AU |
| Comet total magnitude (M1) | 12.5 |
| Comet nuclear magnitude (M2) | 16.0 |
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. [4] It was last observed on February 10, 1927. [2]
It was confirmed by George Van Biesbroeck (Yerkes Observatory, Wisconsin, United States) and Frank Watson Dyson (Greenwich Observatory, England) on March 1. [4]
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. [2] Searches in 1932 and 1937 were unsuccessful. [4]
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 (190 million km) from the Sun.
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