25D/Neujmin
| Discovery | |
|---|---|
| Discovered by | Grigory Neujmin |
| Discovery date | 24 February 1916 |
| Designations | |
| D/1916 D1 D/1926 V2 | |
| |
| Orbital characteristics[3] | |
| Epoch | 21 March 1927 (JD 2424960.5) |
| Observation arc | 10.94 years[1] |
| Number of observations | 116[1] |
| 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?[2] (unobserved) |
| Next perihelion | 24 Feb 2031?[2] (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.[1]
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.[1] Searches in 1932 and 1937 were unsuccessful.[4]
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 (190 million km) from the Sun.
References
- ^ a b c d "25D/Neujmin Orbit". Minor Planet Center. Retrieved 26 February 2019.
- ^ a b S. Yoshida. "25D/Neujmin 2". www.aerith.net. Retrieved 26 February 2019.
- ^ "25D/Neujmin 2 – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 25 November 2025.
- ^ a b c G. W. Kronk. "25D/Neujmin 2". Cometography.com. Retrieved 26 February 2018.
External links
- 25D/Neujmin at the JPL Small-Body Database
- 25D/Neujmin at Gary W. Kronk's Cometography
- 25D/Neujmin at Kazuo Kinoshita's website
- 25D/Neujmin at Seiichi Yoshida's website