1855 Korolev

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1855 Korolev
Discovery [1]
Discovered by L. Chernykh
Discovery site Crimean Astrophysical Obs.
Discovery date 8 October 1969
MPC designation 1855 Korolev
Named after
Sergey Korolyov ()[2]
1969 TU1 · 1961 JD
1964 DD
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 55.49 yr (20,266 days)
Aphelion 2.4366 AU
Perihelion 2.0586 AU
2.2476 AU
Eccentricity 0.0841
3.37 yr (1,231 days)
0° 17m 33s / day
Inclination 3.0793°
Physical characteristics
Dimensions 6.789±0.253 km[4]
7.47 km (calculated)[3]
4.65±0.01 h[5]
4.656199±0.000001 h[6]
4.6568±0.0001 h[a]
4.66±0.01 h[7]
0.24 (assumed)[3]
12.70[4] · 12.8[1][3]

1855 Korolev, provisional designation 1969 TU1, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by Russian astronomer Lyudmila Chernykh at the Crimean Astrophysical Observatory in Nauchnyj on 8 October 1969.[8] On the same night, she also discovered 1856 Růžena.

The S-type asteroid orbits the Sun at a distance of 2.1–2.4 AU once every 3 years and 4 months (1,231 days). Its orbit has an eccentricity of 0.08 and an inclination of 3° with respect to the ecliptic.[1] Korolev was first identified as 1961 JD at Goethe Link Observatory in 1961, extending the body's observation arc by 8 years prior to its official discovery observation.[8]

According to the surveys carried out by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Korolev measures 6.79 kilometers in diameter, and its surface has a high albedo of 0.319,[4] while the Collaborative Asteroid Lightcurve Link assumes an albedo for of 0.24 – derived from 8 Flora, the largest member and namesake of its orbital family – and calculates a diameter of 7.47 kilometers based on an absolute magnitude of 12.8.[3]

In March 2008, three rotational light-curves of Korolev were obtained from photometric observation made by astronomers James W. Brinsfield, Petr Pravec and René Roy, giving a well-defined rotation period of 4.65–4.66 hours with a brightness variation 0.75 and 0.76 magnitude, respectively (U=3/2/3).[5][7][a] Another concurring light-curve was published in March 2016, using sparse-in-time photometry data from the Lowell Photometric Database (U=n.a.).[6]

This minor planet was named in honor of Sergei Korolev (1907–1966), an outstanding designer, integrator, organizer and strategic planner. He was the lead Soviet rocket engineer and spacecraft designer in the Space Race between the United States and the Soviet Union during the 1950s and 1960s until his early death. The lunar and Martian craters Korolev are also named in his honour.[2] Naming citation was published before November 1977 (M.P.C. 3825).[9]


  1. ^ a b Pravec (2008) web: rotation period 4.6568±0.0001 hours with a brightness amplitude of 0.75 mag and a quality code of 3. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1855) Korolev
  1. ^ a b c d "JPL Small-Body Database Browser: 1855 Korolev (1969 TU1)" (2016-11-04 last obs.). Jet Propulsion Laboratory. Retrieved 13 December 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1855) Korolev. 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 (1855) Korolev". Asteroid Lightcurve Database (LCDB). Retrieved 13 December 2016. 
  4. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 13 December 2016. 
  5. ^ a b Brinsfield, James W. (September 2008). "Asteroid Lightcurve Analysis at the Via Capote Observatory: First Quarter 2008". The Minor Planet Bulletin. 35 (3): 119–122. Bibcode:2008MPBu...35..119B. ISSN 1052-8091. Retrieved 13 December 2016. 
  6. ^ a b Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909Freely accessible. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 13 December 2016. 
  7. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1855) Korolev". Geneva Observatory. Retrieved 13 December 2016. 
  8. ^ a b "1855 Korolev (1969 TU1)". Minor Planet Center. Retrieved 13 December 2016. 
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 13 December 2016. 

External links[edit]