|Discovered by||Grigory Nikolaevich Neujmin|
|Discovery date||September 3, 1913|
|1913 III; 1931 I; 1948 XIII;
1966 VI; 1984 XIX
|Orbital characteristics A|
|Epoch||March 6, 2006|
|Semi-major axis||6.911 AU|
|Orbital period||18.17 a|
|Last perihelion||December 27, 2002|
|Next perihelion||March 11, 2021|
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 1.5AU, this comet does not make close approaches to the Earth.
The comet nucleus is estimated to be 21.4 kilometers in diameter with a low albedo of 0.025. Since 28P has such a large nucleus, it will become brighter than the 20th magnitude in early 2019, roughly 2 years before coming to perihelion. When it comes to opposition in May 2020, when it is still 3.5 AU from the Sun, it will likely have an apparent magnitude around 16.9. But during the 2021 perihelion passage the comet will be on the opposite side of the Sun as the Earth. The comet is not known for bright outbursts of activity.
- Seiichi Yoshida (2004-09-07). "28P/Neujmin 1". Seiichi Yoshida's Comet Catalog. Retrieved 2010-02-26.
- Syuichi Nakano (2001-05-01). "28P/Neujmin 1 (NK 798)". OAA Computing and Minor Planet Sections. Retrieved 2010-02-26.
- Patrick Rocher (February 12, 2004). "Note number : 0140 P/Neujmin 1 : 28P". Institut de mécanique céleste et de calcul des éphémérides. Retrieved 2012-02-19.
- "JPL Small-Body Database Browser: 28P/Neujmin 1" (last observation: 2004-02-12). Jet Propulsion Laboratory. Retrieved 2010-02-25.
- "JPL Close-Approach Data: 28P/Neujmin 1" (last observation: 2004-02-12). Retrieved 2011-05-10.
- Orbital simulation from JPL (Java) / Horizons Ephemeris
- 28P at Kronk's Cometography
- 28P/Neujmin 1 (2002)
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