1671 Chaika

1671 Chaika, provisional designation 1934 TD, is a background asteroid from the Astraea region in the central asteroid belt, approximately 10 kilometers (6 miles) in diameter. It was discovered on 3 October 1934, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[1] The assumed S-type asteroid has a rotation period of 3.8 hours.[11] It was named for Soviet cosmonaut Valentina Tereshkova.[2]

1671 Chaika
Discovery [1]
Discovered byG. Neujmin
Discovery siteSimeiz Obs.
Discovery date3 October 1934
Designations
(1671) Chaika
Named after
Valentina Tereshkova [2]
(Soviet cosmonaut)
1934 TD · 1930 WE
1952 BX · 1955 XA
1963 SO · 1971 RC
A907 GM
main-belt [1][3] · (middle)
background [4] · Astraea [5]
Orbital characteristics [3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc87.90 yr (32,107 d)
Aphelion3.2516 AU
Perihelion1.9223 AU
2.5870 AU
Eccentricity0.2569
4.16 yr (1,520 d)
80.231°
0° 14m 12.84s / day
Inclination3.9660°
177.17°
250.27°
Physical characteristics
Mean diameter
7.478±0.728 km[6]
9.37±0.46 km[7]
10.222±0.048 km[8]
13.29±1.71 km[9]
3.7718±0.0002 h[10]
0.120[6]
0.145[9]
0.2463[8]
0.291[7]
S (assumed)[11]
12.1[1][3][6][7][8][9][11]

    Orbit and classification

    According to a HCM-analysis by Nesvorný, Chaika is a non-family asteroid from the main belt's background population,[4] while for Milani and Knežević, it is a member of the larger Astraea family, named after 5 Astraea.[5] The Astraea family is not recognized by Nesvorný as a collisional asteroid family, who rather considers it an artifact in the model due to a resonant alignment.[12]

    It orbits the Sun in the central asteroid belt at a distance of 1.9–3.3 AU once every 4 years and 2 months (1,520 days; semi-major axis of 2.59 AU). Its orbit has an eccentricity of 0.26 and an inclination of 4° with respect to the ecliptic.[3] The asteroid was first observed at the Lowell Observatory in April 1907. The body's observation arc begins at the Tokyo Observatory (389) in November 1930, almost 4 years prior to its official discovery observation at Simeiz–Crimea.[1]

    Naming

    This minor planet was named in honor of Soviet cosmonaut Valentina "Chaika" Tereshkova (born 1937). Tereshkova received the call sign "Chaika" – the Russian word for seagull – as she was the first woman to fly in space.[2] The asteroid's name was proposed by the Institute of Theoretical Astronomy (ITA) in St Petersburg. The official naming citation was published by the Minor Planet Center on 1 June 1967 (M.P.C. 2740).[13]

    Physical characteristics

    Chaika is an assumed, stony S-type asteroid.[11]

    Rotation period

    In November 2005, a rotational lightcurve of Chaika was obtained from photometric observations by Italian astronomers Roberto Crippa, Federico Manzini and Josep Coloma. Lightcurve analysis gave a rotation period of 3.7718±0.0002 hours with a brightness variation of 0.18 magnitude (U=3).[10] John Menke in collaboration with Walter Cooney and David Higgins determined a concurring period of 3.774±0.003 hours with an amplitude of 0.20 magnitude (U=3).[14]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Chaika measures between 7.5 and 13.3 kilometers in diameter and its surface has an albedo between 0.12 and 0.29.[6][7][8][9] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 11.30 kilometers based on an absolute magnitude of 12.1.[11]

    References
    1. "1671 Chaika (1934 TD)". Minor Planet Center. Retrieved 10 December 2018.
    2. Schmadel, Lutz D. (2007). "(1671) Chaika". Dictionary of Minor Planet Names – (1671) Chaika. Springer Berlin Heidelberg. p. 133. doi:10.1007/978-3-540-29925-7_1672. ISBN 978-3-540-00238-3.
    3. "JPL Small-Body Database Browser: 1671 Chaika (1934 TD)" (2018-10-18 last obs.). Jet Propulsion Laboratory. Retrieved 10 December 2018.
    4. "Asteroid 1671 Chaika". Small Bodies Data Ferret. Retrieved 10 December 2018.
    5. "Asteroid (1671) Chaika – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 10 December 2018.
    6. Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System: EAR-A-COMPIL-5-NEOWISEDIAM-V1.0. Bibcode:2016PDSS..247.....M. Retrieved 10 December 2018.
    7. 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.
    8. 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. (catalog)
    9. Hasegawa, Sunao; Müller, Thomas G.; Kuroda, Daisuke; Takita, Satoshi; Usui, Fumihiko (April 2013). "The Asteroid Catalog Using AKARI IRC Slow-Scan Observations". Publications of the Astronomical Society of Japan. 65 (2): 11. arXiv:1210.7557. Bibcode:2013PASJ...65...34H. doi:10.1093/pasj/65.2.34.
    10. Behrend, Raoul. "Asteroids and comets rotation curves – (1671) Chaika". Geneva Observatory. Retrieved 10 December 2018.
    11. "LCDB Data for (1671) Chaika". Asteroid Lightcurve Database (LCDB). Retrieved 10 December 2018.
    12. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    13. 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.
    14. Menke, John; Cooney, Walt; Gross, John; Terrell, Dirk; Higgins, David (October 2008). "Asteroid Lightcurve Analysis at Menke Observatory". The Minor Planet Bulletin. 35 (4): 155–160. Bibcode:2008MPBu...35..155M. ISSN 1052-8091.

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