 Sketch of Comet Neujmin 1 as seen byEdward E. Barnard from theYerkes Observatory on 9 September 1913. | |
| Discovery | |
|---|---|
| Discovered by | Grigory Neujmin |
| Discovery date | 3 September 1913 |
| Designations | |
| P/1913 R2, P/1931 S1 | |
| |
| Orbital characteristics[4][5] | |
| 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[1][2] |
| Next perihelion | 23 July 2039[3] |
| TJupiter | 2.168 |
| EarthMOID | 0.574 AU |
| JupiterMOID | 0.960 AU |
| Physical characteristics[4][6] | |
| Dimensions | 21.4 km (13.3 mi) |
| 12.75±0.03 hours | |
| 0.025 | |
| Comet total magnitude (M1) | 13.2 |
28P/Neujmin, also known asNeujmin 1, is a large periodiccomet in theSolar System. With aperihelion distance (closest approach to the Sun) of 1.5 AU (220 million km), this comet does not make close approaches to the Earth.[4]
Thecomet nucleus is estimated to be 21.4 km (13.3 mi) in diameter with a lowalbedo of 0.025.[4] Since 28P has such a large nucleus, it became brighter than the 20thmagnitude in early 2019, roughly 2 years before coming toperihelion. When it came toopposition in May 2020, when it was still 3.5 AU (520 million km) from the Sun, it had an apparent magnitude around 16.9. But during the 2021 perihelion passage the comet was on the opposite side of the Sun as the Earth. The comet is not known for bright outbursts of activity.
| Numbered comets | ||
|---|---|---|
| Previous 27P/Crommelin | 28P/Neujmin | Next 29P/Schwassmann–Wachmann |
 | This comet-related article is astub. You can help Wikipedia byadding missing information. |
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