# 25D/Neujmin

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For other comets of the same name, see [Comet Neujmin](/source/Comet_Neujmin).

**25D/Neujmin**, otherwise known as **Comet Neujmin 2**, is a [periodic comet](/source/Periodic_comet) in the [Solar System](/source/Solar_System) discovered by [Grigory N. Neujmin](/source/Grigory_N._Neujmin) ([Simeis](/source/Simeis)) on February 24, 1916.[5] It was last observed on February 10, 1927, and has not been observed in 99 years.[1]

It was confirmed by [George Van Biesbroeck](/source/George_Van_Biesbroeck) ([Yerkes Observatory](/source/Yerkes_Observatory), [Wisconsin](/source/Wisconsin), United States) and [Frank Watson Dyson](/source/Frank_Watson_Dyson) ([Greenwich Observatory](/source/Greenwich_Observatory), [England](/source/England)) on March 1.[5]

A prediction by [Andrew Crommelin](/source/Andrew_Claude_de_la_Cherois_Crommelin) ([Royal Observatory](/source/Royal_Observatory,_Greenwich), [Greenwich](/source/Greenwich), [England](/source/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.[5]

Consequently, this comet has remained a [lost comet](/source/Lost_comet) since 1927. As of 2026 and using the JPL Horizons nominal orbit, the comet is still expected to come to perihelion around 1.45 astronomical units from the Sun.[3]

The comet has not been observed during the last 18 perihelion passages: 1932, 1937, 1943, 1948, 1954, 1959, 1965, 1971, 1976, 1981, 1987, 1992, 1998, 2003, 2008, 2014, 2019, and 2025.[2]

## References

1. ["25D/Neujmin Orbit"](https://www.minorplanetcenter.net/db_search/show_object?object_id=25D). [Minor Planet Center](/source/Minor_Planet_Center). Retrieved 2019-02-26.

1. S. Yoshida. ["25D/Neujmin 2"](http://www.aerith.net/comet/catalog/0025D/index.html). *www.aerith.net*. Retrieved 2019-02-26.

1. ["Horizons Batch for 25D/Neujmin 2 (90000357) on 2031-Feb-24"](https://ssd.jpl.nasa.gov/horizons_batch.cgi?batch=1&COMMAND=%27DES%3D25D%3BCAP%27&START_TIME=%272031-Feb-23%27&STOP_TIME=%272031-Feb-25%27&STEP_SIZE=%273%20hours%27&QUANTITIES=%2719%27) (Perihelion occurs when rdot flips from negative to positive). [JPL Horizons](/source/JPL_Horizons_On-Line_Ephemeris_System). Retrieved 2026-04-05. (JPL#7/Soln.date: 2003-Apr-18)

1. K. Kinoshita (2003-05-31). ["25D/Neujmin past, present and future orbital elements"](http://jcometobs.web.fc2.com/pcmtn/0025d.htm). *Comet Orbit*. Retrieved 2026-04-10.

1. G. W. Kronk. ["25D/Neujmin 2"](http://cometography.com/pcomets/025d.html). *Cometography.com*. Retrieved 2018-02-26.

## External links

- [25D/Neujmin](https://cometography.com/pcomets/025d.html) at Gary W. Kronk's *Cometography*
- [25D/Neujmin](http://jcometobs.web.fc2.com/pcmtn/0025d.htm) at Kazuo Kinoshita's website
- [25D/Neujmin](http://www.aerith.net/comet/catalog/0025D/index.html) at Seiichi Yoshida's website

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Adapted from the Wikipedia article [25D/Neujmin](https://en.wikipedia.org/wiki/25D%2FNeujmin) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/25D%2FNeujmin?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.