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. 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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