1857 Parchomenko

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1857 Parchomenko
Discovery [1]
Discovered by T. Smirnova
Discovery site Crimean Astrophysical Obs.
Discovery date 30 August 1971
MPC designation (1857) Parchomenko
Named after
Praskoviya Parchomenko
(Russian astronomer)[2]
1971 QS1 · 1931 XT
1941 WJ · 1974 OE1
main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 85.42 yr (31,198 days)
Aphelion 2.5459 AU
Perihelion 1.9414 AU
2.2436 AU
Eccentricity 0.1347
3.36 yr (1,228 days)
0° 17m 35.88s / day
Inclination 4.4006°
Physical characteristics
Dimensions 7.986±0.201[4]
8.513±0.184 km[5]
9.84 km (calculated)[3]
3.08±0.01 h[6]
3.1177±0.0001 h[7]
0.20 (assumed)[3]
SMASS = S[1] · S[3]
12.3[5] · 12.4[1][3]

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.[2][8]

Orbit and classification[edit]

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.[1]

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.[8]

Physical characteristics[edit]

In the SMASS classification, Parchomenko is a common S-type asteroid.[1]

Diameter and albedo[edit]

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.[4][5] 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.[3]

Rotation period[edit]

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).[7]

Suspected binary[edit]

Three possible occultation events were observed, suggesting that Parchomenko might be a binary asteroid, having a minor-planet moon as companion.[7] 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).[6]


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.[2] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3826).[9]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 1857 Parchomenko (1971 QS1)" (2017-05-05 last obs.). Jet Propulsion Laboratory. Retrieved 8 June 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1857) Parchomenko. Springer Berlin Heidelberg. p. 149. ISBN 978-3-540-00238-3. Retrieved 13 December 2016. 
  3. ^ a b c d e f "LCDB Data for (1857) Parchomenko". Asteroid Lightcurve Database (LCDB). Retrieved 13 December 2016. 
  4. ^ a b c 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:1406.6645Freely accessible. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 13 December 2016. 
  5. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 13 December 2016. 
  6. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1857) Parchomenko". Geneva Observatory. Retrieved 13 December 2016. 
  7. ^ a b c 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. ^ a b "1857 Parchomenko (1971 QS1)". Minor Planet Center. Retrieved 13 December 2016. 
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 13 December 2016. 

External links[edit]