28P/Neujmin

28P/Neujmin
Discovery
Discovered by	Grigory Nikolaevich Neujmin
Discovery date	September 3, 1913
Alternative; designations	1913 III; 1931 I; 1948 XIII;; 1966 VI; 1984 XIX
Orbital characteristics A
Epoch	March 6, 2006
Aphelion	12.27 AU
Perihelion	1.551 AU
Semi-major axis	6.911 AU
Eccentricity	0.7755
Orbital period	18.17 a
Inclination	14.2514°
Dimensions	21.4 km
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,^[4] this comet does not make close approaches to the Earth.^[5]

The comet nucleus is estimated to be 21.4 kilometers in diameter with a low albedo of 0.025.^[4] 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.

References

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