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1857 Parchomenko, provisional designation 1971 QS₁, is a stony asteroid and suspected binary from the inner regions of the asteroid belt, approximately 8 kilometers in diameter.

It was discovered on 30 August 1971, by Russian astronomer Tamara Smirnova at Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula, and named after astronomer Praskoviya Parchomenko.

Orbit and classification

Parchomenko orbits the Sun in the inner main-belt at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,228 days). Its orbit has an eccentricity of 0.13 and an inclination of 4° with respect to the ecliptic.

First identified as 1931 XT at Lowell Observatory, the body's first used observation was taken at Nice Observatory in 1939, extending its observation arc by 32 years prior to its official discovery observation at Nauchnyj.

Physical characteristics

In the SMASS classification, Parchomenko is a common S-type asteroid.

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Parchomenko measures 7.99 and 9.84 kilometers in diameter, and its surface has an albedo of 0.295 and 0.333, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.5 kilometers, based on an absolute magnitude of 12.4.

Rotation period

In December 2005, a rotational lightcurve of Parchomenko was obtained from a photometric observations by Robert Stephens, Brian Warner and Petr Pravec. It gave a well-defined rotation period of 3.1177 hours with a brightness variation of 0.22 magnitude (U=3).

Suspected binary

Three possible occultation events were observed, suggesting that Parchomenko might be a binary asteroid, having a minor-planet moon as companion. However, no new findings have been made since. In October 2008, Italian amateur astronomer Silvano Casulli measured a similar period of 3.08 hours with an amplitude of 0.27 magnitude (U=3).

Naming

This minor planet was named in honor of Russian astronomer Praskoviya Parchomenko (1886–1970), who observed and discovered the minor planets 1129 Neujmina and 1166 Sakuntala at the Crimean Simeiz Observatory during the 1930s and 1940s. The official naming citation was published by the Minor Planet Center on 1 June 1975 (M.P.C. 3826).

References

1. ^ "JPL Small-Body Database Browser: 1857 Parchomenko (1971 QS1)" (2017-05-05 last obs.). Jet Propulsion Laboratory. Archived from the original on 20 December 2016. Retrieved 8 June 2017.
2. ^ Schmadel, Lutz D. (2007). "(1857) Parchomenko". Dictionary of Minor Planet Names – (1857) Parchomenko. Springer Berlin Heidelberg. p. 149. doi:10.1007/978-3-540-29925-7_1858. ISBN 978-3-540-00238-3.
3. ^ "LCDB Data for (1857) Parchomenko". Asteroid Lightcurve Database (LCDB). Retrieved 13 December 2016.
4. ^ Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 13 December 2016.
5. ^ Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
6. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1857) Parchomenko". Geneva Observatory. Retrieved 13 December 2016.
7. ^ Stephens, Robert D.; Warner, Brian D.; Pravec, Petr (September 2006). "1857 Parchomenko: a possible main-belt binary asteroids". The Minor Planet Bulletin. 33 (3): 52. Bibcode:2006MPBu...33...52S. ISSN 1052-8091. Retrieved 13 December 2016.
8. ^ "1857 Parchomenko (1971 QS1)". Minor Planet Center. Retrieved 13 December 2016.
9. Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

External links

• Lightcurve plot of 1857 Parchomenko, Palmer Divide Observatory, B. D. Warner (2006)
• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1857 Parchomenko at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1857 Parchomenko at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Baptistina asteroids
• Discoveries by Tamara Mikhaylovna Smirnova
• Named minor planets
• S-type asteroids (SMASS)
• Astronomical objects discovered in 1971