28P/Neujmin
Sketch of Comet Neujmin 1 as seen by Edward E. Barnard from the Yerkes Observatory on 9 September 1913. | |
| Discovery | |
|---|---|
| Discovered by | Grigory Neujmin |
| Discovery date | 3 September 1913 |
| Designations | |
| P/1913 R2, P/1931 S1 | |
| |
| Orbital characteristics | |
| Epoch | 17 October 2024 (JD 2460600.5) |
| Observation arc | 110.58 years |
| Number of observations | 1,276 |
| Aphelion | 12.38 AU |
| Perihelion | 1.585 AU |
| Semi-major axis | 6.983 AU |
| Eccentricity | 0.77297 |
| Orbital period | 18.45 years |
| Inclination | 14.299° |
| 346.39° | |
| Argument of periapsis | 347.47° |
| Mean anomaly | 70.299° |
| Last perihelion | 11 March 2021 |
| Next perihelion | 23 July 2039 |
| TJupiter | 2.168 |
| Earth MOID | 0.574 AU |
| Jupiter MOID | 0.960 AU |
| Physical characteristics | |
| Dimensions | 21.4 km (13.3 mi) |
| 12.75±0.03 hours | |
| 0.025 | |
| Comet total magnitude (M1) | 13.2 |
28P/Neujmin, also known as Neujmin 1, is a large periodic comet in the Solar System. With a perihelion distance (closest approach to the Sun) of 1.5 AU (220 million km), this comet does not make close approaches to the Earth.