1855 Korolev

1855 Korolev (prov. designation: 1969 TU1) is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. Discovered in 1969, it was later named after Soviet rocket engineer Sergei Korolev.[2]

1855 Korolev
Shape model of Korolev from its lightcurve
Discovery[1]
Discovered byL. Chernykh
Discovery siteCrimean Astrophysical Obs.
Discovery date8 October 1969
Designations
(1855) Korolev
Named after
Sergey Korolyov
(Soviet rocket engineer)[2]
1969 TU1 · 1961 JD
1964 DD
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc55.74 yr (20,358 days)
Aphelion2.4363 AU
Perihelion2.0583 AU
2.2473 AU
Eccentricity0.0841
3.37 yr (1,231 days)
286.81°
0° 17m 33.36s / day
Inclination3.0793°
191.03°
349.40°
Physical characteristics
Dimensions6.789±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[lower-alpha 1]
4.66±0.01 h[7]
0.24 (assumed)[3]
0.319±0.032[4]
S[3]
12.70[4] · 12.8[1][3]

    Discovery

    Korolev 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.[2]

    It 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]

    Orbit and classification

    The asteroid orbits the Sun in the inner main-belt 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]

    Naming

    This minor planet was named in honor of Sergei Korolev (1907–1966), a 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] The official naming citation was published by the Minor Planet Center on 1 June 1975 (M.P.C. 3825).[9]

    Physical characteristics

    Korolev is characterized as a common stony S-type asteroid.[3]

    Diameter and albedo

    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 of 0.24 – derived from 8 Flora, the largest member and namesake of its orbital family – and calculates a diameter of 7.47 kilometers with an absolute magnitude of 12.8.[3]

    Rotation period

    In March 2008, three rotational lightcurves 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][lower-alpha 1] Another concurring lightcurve was published in March 2016, using sparse-in-time photometry data from the Lowell Photometric Database (U=n.a.).[6]

    Notes
    1. Lightcurve plot by Pravec (2008) with 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. Unpublished Ondrejov data obtained by the NEO Photometric Program and collaborating projects

    References
    1. "JPL Small-Body Database Browser: 1855 Korolev (1969 TU1)" (2017-02-04 last obs.). Jet Propulsion Laboratory. Retrieved 8 June 2017.
    2. Schmadel, Lutz D. (2007). "(1855) Korolev". Dictionary of Minor Planet Names – (1855) Korolev. Springer Berlin Heidelberg. p. 149. doi:10.1007/978-3-540-29925-7_1856. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1855) Korolev". Asteroid Lightcurve Database (LCDB). Retrieved 13 December 2016.
    4. 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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 13 December 2016.
    5. 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. Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 13 December 2016.
    7. Behrend, Raoul. "Asteroids and comets rotation curves – (1855) Korolev". Geneva Observatory. Retrieved 13 December 2016.
    8. "1855 Korolev (1969 TU1)". Minor Planet Center. Retrieved 13 December 2016.
    9. Schmadel, Lutz D. "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.

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