{{Short description|Main-belt asteroid}} {{Use dmy dates|date=December 2018}} {{Infobox planet | minorplanet = yes | name = 1671 Chaika | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = <ref name="MPC-object" /> | discoverer = G. Neujmin | discovery_site = Simeiz Obs. | discovered = 3 October 1934 | mpc_name = (1671) Chaika | alt_names = 1934 TD{{·}}1930 WE<br />1952 BX{{·}}1955 XA<br />1963 SO{{·}}1971 RC<br />A907 GM | pronounced = | named_after = Valentina Tereshkova<ref name="springer" /><br />{{small|(Soviet cosmonaut)}} | mp_category = main-belt<ref name="MPC-object" /><ref name="jpldata" />{{·}}{{small|(middle)}}<br />{{nowrap|background<ref name="Ferret" />{{·}}Astraea<ref name="AstDys-object" />}} | orbit_ref = <ref name="jpldata" /> | epoch = 27 April 2019 (JD 2458600.5) | uncertainty = 0 | observation_arc = 87.90 yr (32,107 d) | aphelion = 3.2516 AU | perihelion = 1.9223 AU | semimajor = 2.5870 AU | eccentricity = 0.2569 | period = 4.16 yr (1,520 d) | mean_anomaly = 80.231° | mean_motion = {{Deg2DMS|0.2369|sup=ms}} / day | inclination = 3.9660° | asc_node = 177.17° | arg_peri = 250.27° | mean_diameter = {{val|7.478|0.728|ul=km}}<ref name="Mainzer-2016" /><br />{{val|9.37|0.46|u=km}}<ref name="Masiero-2012" /><br />{{val|10.222|0.048|u=km}}<ref name="WISE" /><br />{{val|13.29|1.71|u=km}}<ref name="Hasegawa-2013" /> | rotation = {{val|3.7718|0.0002|ul=h}}<ref name="geneva-obs" /> | albedo = {{val|0.120}}<ref name="Mainzer-2016" /><br />{{val|0.145}}<ref name="Hasegawa-2013" /><br />{{val|0.2463}}<ref name="WISE" /><br />{{val|0.291}}<ref name="Masiero-2012" /> | spectral_type = S {{small|(assumed)}}<ref name="lcdb" /> | abs_magnitude = 12.1<ref name="MPC-object" /><ref name="jpldata" /><ref name="Mainzer-2016" /><ref name="Masiero-2012" /><ref name="WISE" /><ref name="Hasegawa-2013" /><ref name="lcdb" /> }}
'''1671 Chaika''', provisional designation {{mp|1934 TD}}, is a background asteroid from the Astraea region in the central asteroid belt, approximately {{convert|10|km|mi|abbr=off|sigfig=1|sp=us}} in diameter. It was discovered on 3 October 1934, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.<ref name="MPC-object" /> The assumed S-type asteroid has a rotation period of 3.8 hours.<ref name="lcdb" /> It was named for Soviet cosmonaut Valentina Tereshkova.<ref name="springer" />
== Orbit and classification ==
According to a HCM-analysis by Nesvorný, ''Chaika'' is a non-family asteroid from the main belt's background population,<ref name="Ferret" /> while for Milani and Knežević, it is a member of the larger Astraea family, named after 5 Astraea.<ref name="AstDys-object" /> 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.<ref name="Nesvorny-2014" />
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.<ref name="jpldata" /> The asteroid was first observed at the Lowell Observatory in April 1907. The body's observation arc begins at the Tokyo Observatory {{Obscode|389}} in November 1930, almost 4 years prior to its official discovery observation at Simeiz–Crimea.<ref name="MPC-object" />
== 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.<ref name="springer" /> The asteroid's name was proposed by the Institute of Theoretical Astronomy (ITA) in St Petersburg. The official {{MoMP|1671|naming citation}} was published by the Minor Planet Center on 1 June 1967 ({{small|M.P.C. 2740}}).<ref name="DoMP-Circular-dates" />
== Physical characteristics ==
''Chaika'' is an assumed, stony S-type asteroid.<ref name="lcdb" />
=== 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 {{val|3.7718|0.0002}} hours with a brightness variation of 0.18 magnitude ({{small|U=3}}).<ref name="geneva-obs" /> John Menke in collaboration with Walter Cooney and David Higgins determined a concurring period of {{val|3.774|0.003}} hours with an amplitude of 0.20 magnitude ({{small|U=3}}).<ref name="Menke-2008a" />
=== 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.<ref name="Mainzer-2016" /><ref name="Masiero-2012" /><ref name="WISE" /><ref name="Hasegawa-2013" /> 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.<ref name="lcdb" />
== References == {{reflist|30em|refs=
<ref name="jpldata">{{cite web |type = 2018-10-18 last obs. |title = JPL Small-Body Database Browser: 1671 Chaika (1934 TD) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001671 |publisher = Jet Propulsion Laboratory |accessdate = 10 December 2018}}</ref>
<ref name="springer">{{cite book |last = Schmadel | first = Lutz D. |title = Dictionary of Minor Planet Names |publisher = Springer Berlin Heidelberg |page = 133 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1672 |chapter = (1671) Chaika }}</ref>
<ref name="MPC-object">{{cite web |title = 1671 Chaika (1934 TD) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1671 |accessdate = 10 December 2018}}</ref>
<ref name="DoMP-Circular-dates">{{cite book |title = Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) |chapter = Appendix – Publication Dates of the MPCs |last = Schmadel |first=Lutz D. |publisher = Springer Berlin Heidelberg |page = 221 |isbn = 978-3-642-01964-7 |doi = 10.1007/978-3-642-01965-4|year = 2009 |chapter-url = https://cds.cern.ch/record/1339661 }}</ref>
<ref name="geneva-obs">{{cite web |title = Asteroids and comets rotation curves – (1671) Chaika |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#001671 |accessdate = 10 December 2018}}</ref>
<ref name="AstDys-object">{{cite web |title = Asteroid (1671) Chaika – Proper elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = https://newton.spacedys.com/astdys/index.php?n=1671&pc=1.1.6 |accessdate = 10 December 2018}}</ref>
<ref name="Ferret">{{cite web |title = Asteroid 1671 Chaika |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1671+Chaika |accessdate = 10 December 2018}}</ref>
<ref name="Nesvorny-2014">{{Cite book |first1 = D. |last1 = Nesvorný |first2 = M. |last2 = Broz |first3 = V. |last3 = Carruba |date = December 2014 |chapter = Identification and Dynamical Properties of Asteroid Families |title = Asteroids IV |pages = 297–321 |bibcode = 2015aste.book..297N |doi = 10.2458/azu_uapress_9780816532131-ch016 |arxiv = 1502.01628 |isbn = 9780816532131}}</ref>
<ref name="lcdb">{{cite LCDB|number = 1671 |accessdate = 10 December 2018}}</ref>
<ref name="WISE">{{cite journal |display-authors = 6 |first1 = A. |last1 = Mainzer |first2 = T. |last2 = Grav |first3 = J. |last3 = Masiero |first4 = E. |last4 = Hand |first5 = J. |last5 = Bauer |first6 = D. |last6 = Tholen |first7 = R. S. |last7 = McMillan |first8 = T. |last8 = Spahr |first9 = R. M. |last9 = Cutri |first10 = E. |last10 = Wright |first11 = J. |last11 = Watkins |first12 = W. |last12 = Mo |first13 = C. |last13 = Maleszewski |date = November 2011 |title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results |journal = The Astrophysical Journal |volume = 741 |issue = 2 |page = 25 |bibcode = 2011ApJ...741...90M |doi = 10.1088/0004-637X/741/2/90 |arxiv = 1109.6407 }} ([http://iopscience.iop.org/0004-637X/741/2/68/fulltext/apj398969t1_mrt.txt catalog])</ref>
<ref name="Hasegawa-2013">{{Cite journal |first1 = Sunao |last1 = Hasegawa |first2 = Thomas G. |last2 = Müller |first3 = Daisuke |last3 = Kuroda |first4 = Satoshi |last4 = Takita |first5 = Fumihiko |last5 = Usui |date = April 2013 |title = The Asteroid Catalog Using AKARI IRC Slow-Scan Observations |journal = Publications of the Astronomical Society of Japan |volume = 65 |issue = 2 |page = 11 |bibcode = 2013PASJ...65...34H |doi = 10.1093/pasj/65.2.34 |arxiv = 1210.7557}}</ref>
<ref name="Masiero-2012">{{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = A. K. |last2 = Mainzer |first3 = T. |last3 = Grav |first4 = J. M. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = C. |last6 = Nugent |first7 = M. S. |last7 = Cabrera |date = November 2012 |title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids |journal = The Astrophysical Journal Letters |volume = 759 |issue = 1 |page = 5 |bibcode = 2012ApJ...759L...8M |doi = 10.1088/2041-8205/759/1/L8 |arxiv = 1209.5794}}</ref>
<ref name="Mainzer-2016">{{cite journal |display-authors = 6 |first1 = A. K. |last1 = Mainzer |first2 = J. M. |last2 = Bauer |first3 = R. M. |last3 = Cutri |first4 = T. |last4 = Grav |first5 = E. A. |last5 = Kramer |first6 = J. R. |last6 = Masiero |first7 = C. R. |last7 = Nugent |first8 = S. M. |last8 = Sonnett |first9 = R. A. |last9 = Stevenson |first10 = E. L. |last10 = Wright |date = June 2016 |title = NEOWISE Diameters and Albedos V1.0 |url = https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_COMPIL_5_NEOWISEDIAM_V1_0/data/neowise_mainbelt.tab |journal = NASA Planetary Data System |pages = EAR-A-COMPIL-5-NEOWISEDIAM-V1.0 |bibcode = 2016PDSS..247.....M |access-date= 10 December 2018}}</ref>
<ref name="Menke-2008a">{{Cite journal |first1 = John |last1 = Menke |first2 = Walt |last2 = Cooney |first3 = John |last3 = Gross |first4 = Dirk |last4 = Terrell |first5 = David |last5 = Higgins |date = October 2008 |title = Asteroid Lightcurve Analysis at Menke Observatory |journal = The Minor Planet Bulletin |volume = 35 |issue = 4 |pages = 155–160 |issn = 1052-8091 |bibcode = 2008MPBu...35..155M}}</ref>
}} <!-- end of reflist -->
== External links == * [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }}) * [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books * [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend * [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center * {{AstDys|1671}} * {{JPL small body}}
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{{DEFAULTSORT:Chaika}} 001671 Category:Discoveries by Grigory Neujmin Category:Named minor planets Category:Valentina Tereshkova 19341003