# 1671 Chaika

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{{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](/source/Grigory_Neujmin)
 | discovery_site  = [Simeiz Obs.](/source/Simeiz_Observatory)
 | 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](/source/Valentina_Tereshkova)<ref name="springer" /><br />{{small|(Soviet cosmonaut)}}
 | mp_category     = [main-belt](/source/main-belt)<ref name="MPC-object" /><ref name="jpldata" />{{·}}{{small|([middle](/source/Kirkwood_gap))}}<br />{{nowrap|[background](/source/Background_asteroid)<ref name="Ferret" />{{·}}[Astraea](/source/Astraea_family)<ref name="AstDys-object" />}}
 | orbit_ref       = <ref name="jpldata" />
 | epoch           = 27 April 2019 ([JD](/source/Julian_day) 2458600.5)
 | uncertainty     = 0
 | observation_arc = 87.90 [yr](/source/Julian_year_(astronomy)) (32,107 d)
 | aphelion        = 3.2516 [AU](/source/Astronomical_unit)
 | perihelion      = 1.9223 AU
 | semimajor       = 2.5870 AU
 | eccentricity    = 0.2569
 | period          = 4.16 yr (1,520 d)
 | mean_anomaly    = 80.231[°](/source/Degree_(angle))
 | 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](/source/S-type_asteroid) {{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](/source/asteroid) from the [Astraea region](/source/Astraea_family) in the central [asteroid belt](/source/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](/source/Grigory_Neujmin) at the [Simeiz Observatory](/source/Simeiz_Observatory) on the Crimean peninsula.<ref name="MPC-object" /> The assumed [S-type asteroid](/source/S-type_asteroid) has a [rotation period](/source/rotation_period) of 3.8 hours.<ref name="lcdb" /> It was named for Soviet cosmonaut [Valentina Tereshkova](/source/Valentina_Tereshkova).<ref name="springer" />

== Orbit and classification ==

According to a [HCM](/source/Hierarchical_clustering_method)-analysis by [Nesvorný](/source/David_Nesvorn%C3%BD), ''Chaika'' is a non-[family](/source/Asteroid_family) asteroid from the main belt's [background population](/source/Background_asteroid),<ref name="Ferret" /> while for [Milani](/source/Andrea_Milani_(mathematician)) and [Knežević](/source/Zoran_Kne%C5%BEevi%C4%87_(astronomer)), it is a member of the larger [Astraea family](/source/Astraea_family), named after [5&nbsp;Astraea](/source/5%26nbsp%3BAstraea).<ref name="AstDys-object" /> The Astraea family is not recognized by Nesvorný as a collisional [asteroid family](/source/asteroid_family), who rather considers it an artifact in the model due to a [resonant alignment](/source/Secular_resonance).<ref name="Nesvorny-2014" />

It orbits the Sun in the [central](/source/Kirkwood_gap) asteroid belt at a distance of 1.9–3.3&nbsp;[AU](/source/Astronomical_unit) once every 4 years and 2 months (1,520 days; [semi-major axis](/source/semi-major_axis) of 2.59&nbsp;AU). Its orbit has an [eccentricity](/source/orbital_eccentricity) of 0.26 and an [inclination](/source/orbital_inclination) of 4[°](/source/Degree_(angle)) with respect to the [ecliptic](/source/ecliptic).<ref name="jpldata" /> The asteroid was first observed at the [Lowell Observatory](/source/Lowell_Observatory) in April 1907. The body's [observation arc](/source/observation_arc) begins at the Tokyo Observatory {{Obscode|389}} in November 1930, almost 4 years prior to its official discovery observation at [Simeiz–Crimea](/source/Simeiz_Observatory).<ref name="MPC-object" />

== Naming ==

This [minor planet](/source/minor_planet) was named in honor of Soviet cosmonaut [Valentina "Chaika" Tereshkova](/source/Valentina_Tereshkova) (born 1937). Tereshkova received the call sign "Chaika" – the Russian word for [seagull](/source/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](/source/Minor_Planet_Center) on 1 June 1967 ({{small|[M.P.C.](/source/Minor_Planet_Circulars) 2740}}).<ref name="DoMP-Circular-dates" />

== Physical characteristics ==

''Chaika'' is an assumed, stony [S-type asteroid](/source/S-type_asteroid).<ref name="lcdb" />

=== Rotation period ===

In November 2005, a rotational [lightcurve](/source/lightcurve) of ''Chaika'' was obtained from [photometric](/source/Photometry_(astronomy)) observations by Italian astronomers Roberto Crippa, Federico Manzini and Josep Coloma. Lightcurve analysis gave a [rotation period](/source/rotation_period) of {{val|3.7718|0.0002}} hours with a brightness variation of 0.18 [magnitude](/source/Magnitude_(astronomy)) ({{small|[U=3](/source/LCDB_quality_code)}}).<ref name="geneva-obs" /> John Menke in collaboration with [Walter Cooney](/source/Walter_R._Cooney_Jr.) and [David Higgins](/source/David_Higgins_(astronomer)) determined a concurring period of {{val|3.774|0.003}} hours with an amplitude of 0.20 magnitude ({{small|[U=3](/source/LCDB_quality_code)}}).<ref name="Menke-2008a" />

=== Diameter and albedo ===

According to the surveys carried out by the Japanese [Akari satellite](/source/Akari_(satellite)) and the [NEOWISE](/source/NEOWISE) mission of NASA's [Wide-field Infrared Survey Explorer](/source/Wide-field_Infrared_Survey_Explorer), ''Chaika'' measures between 7.5 and 13.3 kilometers in diameter and its surface has an [albedo](/source/astronomical_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](/source/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](/source/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}}

{{Minor planets navigator |1670 Minnaert |number=1671 |1672 Gezelle}}
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{{DEFAULTSORT:Chaika}}
001671
Category:Discoveries by Grigory Neujmin
Category:Named minor planets
Category:Valentina Tereshkova
19341003

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Adapted from the Wikipedia article [1671 Chaika](https://en.wikipedia.org/wiki/1671_Chaika) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/1671_Chaika?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.