74P/Smirnova–Chernykh

74P/Smirnova–Chernykh
Comet Smirnova–Chernykh near galaxy PGC 49413 on 25 January 2010
Discovery[1]
Discovered byTamara M. Smirnova
Nikolai S. Chernykh
Discovery siteCrimean Astrophysical Observatory
Discovery date4 March 1975
Designations
P/1967 EU, P/1975 E2
  • 1967 XV, 1975 VII
  • 1984 V, 1992 XXI
Orbital characteristics[2][3]
Epoch21 November 2025 (JD 2461000.5)
Observation arc58.95 years
Earliest precovery date9 March 1967
Number of
observations		6,540
Aphelion5.391 AU
Perihelion4.836 AU
Semi-major axis5.114 AU
Eccentricity0.05432
Orbital period11.56 years
Inclination6.015°
51.724°
Argument of
periapsis		59.702°
Mean anomaly348.44°
Last perihelion2 March 2026[4]
Next perihelion14 June 2034[5]
TJupiter3.007
Earth MOID2.567 AU
Jupiter MOID0.479 AU
Physical characteristics[2]
Mean radius
2.23 km (1.39 mi)[6]
Comet total
magnitude (M1)		6.7
Comet nuclear
magnitude (M2)		12.1
Perihelion distance
at different epochs[7]
EpochPerihelion
(AU)
19295.68
19673.55
20264.84
20343.84

74P/Smirnova–Chernykh is an Encke-type comet with a 5:7 orbital resonance with Jupiter.[8] It is also classified as a quasi-Hilda comet.[9] It was discovered in late March 1975 by Tamara Mikhaylovna Smirnova while examining exposures from the Crimean Astrophysical Observatory.[10] In the discovery images the comet had an apparent magnitude of ~15.[10] In the year of discovery, the comet came to perihelion on 6 August 1975.[10]

The comet had been photographed during 1967, but was identified as an asteroid and assigned the designation 1967 EU.[11][12]

The comet is estimated at 4.46 km (2.77 mi) in diameter.[6]

A close approach to Jupiter in 2021 lifted perihelion from 3.54 AU to 4.84 AU.

See also

References

  1. ↑ T. M. Smirnova; N. S. Chernykh (13 January 2004). "Comet Smirnova–Chernykh (1975e)". IAU Circular. 8267 (1). Bibcode:1975IAUC.2764....1S.
  2. 1 2 "74P/Smirnova–Chernykh – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory. Retrieved 25 January 2010.
  3. ↑ "74P/Smirnova–Chernykh Orbit". Minor Planet Center. Retrieved 24 February 2019.
  4. ↑ "Horizons Batch for 74P/Smirnova-Chernykh (90000821) on 2026-Mar-02" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 29 September 2025. (JPL#K264/21, Soln.date: 2025-Oct-01)
  5. ↑ "Horizons Batch for 74P/Smirnova-Chernykh (90000821) on 2034-Jun-14" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Archived from the original on 29 September 2025. Retrieved 29 September 2025. (JPL#K264/20, Soln.date: 2025-Sep-22)
  6. 1 2 P. L. Lamy; I. Toth; Y. R. Fernández; H. A. Weaver (2004). "The Sizes, Shapes, Albedos, and Colors of Cometary Nuclei" (PDF). Comets II. University of Arizona Press. pp. 223–264. Bibcode:2004come.book..223L. doi:10.2307/j.ctv1v7zdq5.22. ISBN 978-0-8165-2450-1. JSTOR j.ctv1v7zdq5.22.
  7. ↑ Kinoshita, Kazuo (13 November 2018). "74P/Smirnova-Chernykh past, present and future orbital elements". Comet Orbit. Retrieved 5 October 2025.
  8. ↑ G. Kastel (1975). "The new Comet 1975e Smirnova–Chernykh". Soviet Astronomy Letters (in Russian). 1: 155. Bibcode:1975SvAL....1..155K.
  9. ↑ I. Toth (2006). "The quasi-Hilda subgroup of ecliptic comets - an update" (PDF). Astronomy and Astrophysics. 448 (3): 1191–1196. Bibcode:2006A&A...448.1191T. doi:10.1051/0004-6361:20053492.
  10. 1 2 3 G. W. Kronk. "74P/Smirnova–Chernykh". Cometography. Retrieved 25 January 2010.
  11. ↑ S. Nakano (1984). Identifications of Minor Planets with Comets. pp. 453–454. Bibcode:1984impw.book.....N.
  12. ↑ Seiichi Yoshida (28 August 2005). "74P/Smirnova-Chernykh". Seiichi Yoshida's Comet Catalog. Retrieved 25 January 2010.
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