25D/Neujmin

25D/Neujmin
Discovery
Discovered byGrigory Neujmin
Discovery date24 February 1916
Designations
D/1916 D1
D/1926 V2
  • Neujmin 2
  • 1916 II, 1927 I
  • 1916a, 1926g
Orbital characteristics[5]
Epoch21 March 1927 (JD 2424960.5)
Observation arc10.94 years[1]
(Not observed in 99 years)
Number of
observations		116[1]
Aphelion4.840 AU
Perihelion1.338 AU
Semi-major axis3.089 AU
Eccentricity0.56682
Orbital period5.429 years
Inclination10.639°
328.72°
Argument of
periapsis		193.70°
Mean anomaly11.577°
Last perihelion11 May 2025?[2]
(unobserved)
Next perihelion24 Feb 2031?[3][4][2]
(Lost since 1927)
TJupiter2.932
Earth MOID0.35 AU
Comet total
magnitude (M1)		12.5
Comet nuclear
magnitude (M2)		16.0

25D/Neujmin, otherwise known as Comet Neujmin 2, is a periodic comet in the Solar System discovered by Grigory N. Neujmin (Simeis) on February 24, 1916.[6] It was last observed on February 10, 1927, and has not been observed in 99 years.[1]

It was confirmed by George Van Biesbroeck (Yerkes Observatory, Wisconsin, United States) and Frank Watson Dyson (Greenwich Observatory, England) on March 1.[6]

A prediction by Andrew Crommelin (Royal Observatory, Greenwich, 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.[6]

Consequently, this comet has remained a 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 AU (217 million km) 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. ^ a b c d "25D/Neujmin Orbit". Minor Planet Center. Retrieved 26 February 2019.
  2. ^ a b c S. Yoshida. "25D/Neujmin 2". www.aerith.net. Retrieved 26 February 2019.
  3. ^ a b "Horizons Batch for 25D/Neujmin 2 (90000357) on 2031-Feb-24" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 5 April 2026. (JPL#7/Soln.date: 2003-Apr-18)
  4. ^ K. Kinoshita (31 May 2003). "25D/Neujmin past, present and future orbital elements". Comet Orbit. Retrieved 10 April 2026.
  5. ^ "25D/Neujmin 2 – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 25 November 2025.
  6. ^ a b c G. W. Kronk. "25D/Neujmin 2". Cometography.com. Retrieved 26 February 2018.


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