{{Short description|Main-belt asteroid}} {{Use dmy dates|date=May 2018}} {{Infobox planet | minorplanet = yes | name = 3640 Gostin | background = #D6D6D6 | image = | image_size = | caption = | discovery_ref = <ref name="MPC-object" /> | discoverer = C. Shoemaker<br />E. Shoemaker | discovery_site = Palomar Obs. | discovered = 11 October 1985 | mpc_name = (3640) Gostin | alt_names = {{mp|1985 TR|3}}{{·}}1955 SS<br />1960 CB{{·}}1970 CS<br />{{mp|1972 VJ|1}} | pronounced = | named_after = Victor Gostin<ref name="MPC-object" /><br />{{small|(Australian geologist)}} | mp_category = main-belt<ref name="MPC-object" /><ref name="jpldata" />{{·}}{{small|(inner)}}<br />Flora<ref name="lcdb" /><ref name="Ferret" /> | orbit_ref = <ref name="jpldata" /> | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 61.63 yr (22,511 d) | aphelion = 2.4175 AU | perihelion = 2.0311 AU | semimajor = 2.2243 AU | eccentricity = 0.0869 | period = 3.32 yr (1,212 d) | mean_anomaly = 224.62° | mean_motion = {{Deg2DMS|0.2971|sup=ms}} / day | inclination = 4.3118° | asc_node = 289.19° | arg_peri = 155.59° | mean_diameter = {{val|7.148|0.088|ul=km}}<ref name="Masiero-2014" /><br />{{val|7.613|0.096|u=km}}<ref name="WISE" /><br />8.58 km {{small|(calculated)}}<ref name="lcdb" /> | rotation = {{val|3.26|0.05|ul=h}}<ref name="Chang-2014a" /><br />{{val|3.263|0.0009|u=h}}<ref name="Waszczak-2015" /><br />{{val|3.263|0.003|u=h}}<ref name="Klinglesmith-2016b" /><br />{{val|3.2641|0.0005|u=h}}<ref name="Albers-2010" /> | albedo = {{val|0.2127|0.0446}}<ref name="WISE" /><br />{{val|0.239|0.036}}<ref name="Masiero-2014" /><br />{{val|0.24}} {{small|(assumed)}}<ref name="lcdb" /> | spectral_type = SMASS {{=}} S<ref name="jpldata" /><ref name="lcdb" /> | abs_magnitude = {{val|12.26|0.14}} {{small|(R)}}<ref name="Chang-2014a" /><br />{{val|12.398|0.001}} {{small|(R)}}<ref name="Waszczak-2015" /><br />12.5<ref name="jpldata" /><ref name="lcdb" /><br />{{val|12.62|0.20}}<ref name="Veres-2015" /><br />12.9<ref name="WISE" /> }}
'''3640 Gostin''', provisional designation {{mp|1985 TR|3}}, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately {{convert|8|km|mi|abbr=off|sigfig=1|sp=us}} in diameter. It was discovered on 11 October 1985, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California.<ref name="MPC-object" /> The S-type asteroid has a rotation period of 3.26 hours.<ref name="lcdb" /> It was named for Australian geologist Victor Gostin.<ref name="MPC-object" />
== Orbit and classification ==
''Gostin'' is a member of the Gondolatsch-cluster within the Flora family ({{small|402}}),<ref name="lcdb" /><ref name="Ferret" /> a giant asteroid family and the largest family of stony asteroids in the main-belt,<ref name="Nesvorny-2014" />
It orbits the Sun in the inner main-belt at a distance of 2.0–2.4 AU once every 3 years and 4 months (1,212 days; semi-major axis of 2.22 AU). Its orbit has an eccentricity of 0.09 and an inclination of 4° with respect to the ecliptic.<ref name="jpldata" /> The body's observation arc begins with its first observation as {{mp|1955 SS}} at the Goethe Link Observatory in September 1955, or 30 years prior to its official discovery observation at Palomar.<ref name="MPC-object" />
== Physical characteristics ==
In the SMASS classification, ''Gostin'' is a common, stony S-type asteroid.<ref name="jpldata" />
=== Rotation period ===
In March 2010, a rotational lightcurve of ''Gostin'' was obtained from photometric observations at the Oakley Southern Sky Observatory. Lightcurve analysis gave a well-defined rotation period of 3.2641 hours with a brightness variation of 0.40 magnitude ({{small|U=3}}).<ref name="Albers-2010" /> Concurring lightcurves were also obtained at the Palomar Transient Factory and at the Etscorn Campus Observatory ({{small|U=3/2/3}}).<ref name="lcdb" /><ref name="Chang-2014a" /><ref name="Waszczak-2015" /><ref name="Klinglesmith-2016b" />
=== Diameter and albedo ===
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ''Gostin'' measures 7.148 and 7.613 kilometers in diameter and its surface has an albedo of 0.239 and 0.2127, respectively.<ref name="Masiero-2014" /><ref name="WISE" /> The ''Collaborative Asteroid Lightcurve Link'' assumes an albedo of 0.24 – derived from 8 Flora, the parent body of the Flora family – and calculates a diameter of 8.58 kilometers based on an absolute magnitude of 12.5.<ref name="lcdb" />
== Naming ==
This minor planet was named by the discoverers after Australian geologist Victor Gostin (born 1940) of the University of Adelaide, who in the 1980s discovered the ejecta layer from the Acraman bolide impact at a distance of 300 kilometers from the impact site, within Ediacaran sedimentary rocks of the Flinders Ranges, South Australia, which enabled the impact to be dated at ~580 Ma.<ref name="MPC-object" /><ref name="Gostin-1986" /> The official naming citation was published by the Minor Planet Center on 2 February 1988 ({{small|M.P.C. 12808}}).<ref name="MPC-Circulars-Archive" />
== References == {{reflist|30em|refs=
<ref name="jpldata">{{cite web |type = 2017-05-05 last obs. |title = JPL Small-Body Database Browser: 3640 Gostin (1985 TR3) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2003640 |publisher = Jet Propulsion Laboratory |access-date = 15 May 2018}}</ref>
<ref name="MPC-object">{{cite web |title = 3640 Gostin (1985 TR3) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=3640 |access-date = 15 May 2018}}</ref>
<ref name="Gostin-1986">{{Cite journal |first1 = V. A. |last1 = Gostin |first2 = P. W. |last2 = Haines |first3 = R. J. F. |last3 = Jenkins |first4 = W. |last4 = Compston |first5 = I. S. |last5 = Williams |date = July 1986 |title = Impact ejecta horizon within late Precambrian shales, Adelaide Geosyncline, South Australia |journal = Science |volume = 233 |issue = 4760 |pages = 198–200 |issn = 0036-8075 |bibcode = 1986Sci...233..198G |doi = 10.1126/science.233.4760.198|pmid = 17737290 |s2cid = 11307364 }}</ref>
<ref name="MPC-Circulars-Archive">{{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |access-date = 15 May 2018}}</ref>
<ref name="Masiero-2014">{{cite journal |display-authors = 6 |first1 = Joseph R. |last1 = Masiero |first2 = T. |last2 = Grav |first3 = A. K. |last3 = Mainzer |first4 = C. R. |last4 = Nugent |first5 = J. M. |last5 = Bauer |first6 = R. |last6 = Stevenson |first7 = S. |last7 = Sonnett |date = August 2014 |title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos |journal = The Astrophysical Journal |volume = 791 |issue = 2 |page = 11 |bibcode = 2014ApJ...791..121M |doi = 10.1088/0004-637X/791/2/121 |arxiv = 1406.6645|s2cid = 119293330 }}</ref>
<ref name="Ferret">{{cite web |title = Asteroid 3669 Vertinskij |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=3640%20Gostin |access-date = 15 May 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|s2cid = 119280014 }}</ref>
<ref name="lcdb">{{cite LCDB|number = 3640 |access-date = 15 May 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 |s2cid = 35447010 }} ([http://iopscience.iop.org/0004-637X/741/2/68/fulltext/apj398969t1_mrt.txt catalog])</ref>
<ref name="Chang-2014a">{{cite journal |display-authors = 6 |first1 = Chan-Kao |last1 = Chang |first2 = Wing-Huen |last2 = Ip |author2-link=Ip Wing-huen |first3 = Hsing-Wen |last3 = Lin |first4 = Yu-Chi |last4 = Cheng |first5 = Chow-Choong |last5 = Ngeow |first6 = Ting-Chang |last6 = Yang |first7 = Adam |last7 = Waszczak |first8 = Shrinivas R. |last8 = Kulkarni |first9 = David |last9 = Levitan |first10 = Branimir |last10 = Sesar |first11 = Russ |last11 = Laher |first12 = Jason |last12 = Surace |first13 = Thomas. A. |last13 = Prince |date = June 2014 |title = 313 New Asteroid Rotation Periods from Palomar Transient Factory Observations |journal = The Astrophysical Journal |volume = 788 |issue = 1 |page = 21 |bibcode = 2014ApJ...788...17C |doi = 10.1088/0004-637X/788/1/17 |arxiv = 1405.1144|s2cid = 51100134 }}</ref>
<ref name="Albers-2010">{{Cite journal |display-authors = 6 |first1 = Kenda |last1 = Albers |first2 = Katherine |last2 = Kragh |first3 = Adam |last3 = Monnier |first4 = Zachary |last4 = Pligge |first5 = Kellen |last5 = Stolze |first6 = Josh |last6 = West |first7 = Arnold |last7 = Yim |first8 = Richard |last8 = Ditteon |date = October 2010 |title = Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2009 October thru 2010 April |journal = The Minor Planet Bulletin |volume = 37 |issue = 4 |pages = 152–158 |issn = 1052-8091 |bibcode = 2010MPBu...37..152A}}</ref>
<ref name="Klinglesmith-2016b">{{Cite journal |first1 = Daniel A. III |last1 = Klinglesmith |first2 = Sebastian |last2 = Hendrickx |first3 = Karl |last3 = Madden |first4 = Samuel |last4 = Montgomery |date = April 2016 |title = Lightcurves for Shape/Spin Models |journal = The Minor Planet Bulletin |volume = 43 |issue = 2 |pages = 123–128 |issn = 1052-8091 |bibcode = 2016MPBu...43..123K}}</ref>
<ref name="Waszczak-2015">{{cite journal |display-authors = 6 |first1 = Adam |last1 = Waszczak |first2 = Chan-Kao |last2 = Chang |first3 = Eran O. |last3 = Ofek |first4 = Russ |last4 = Laher |first5 = Frank |last5 = Masci |first6 = David |last6 = Levitan |first7 = Jason |last7 = Surace |first8 = Yu-Chi |last8 = Cheng |first9 = Wing-Huen |last9 = Ip |first10 = Daisuke |last10 = Kinoshita |first11 = George |last11 = Helou |first12 = Thomas A. |last12 = Prince |first13 = Shrinivas |last13 = Kulkarni |date = September 2015 |title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry |journal = The Astronomical Journal |volume = 150 |issue = 3 |page = 35 |bibcode = 2015AJ....150...75W |doi = 10.1088/0004-6256/150/3/75 |arxiv = 1504.04041|s2cid = 8342929 }}</ref>
<ref name="Veres-2015">{{cite journal |display-authors = 6 |first1 = Peter |last1 = Veres |first2 = Robert |last2 = Jedicke |first3 = Alan |last3 = Fitzsimmons |first4 = Larry |last4 = Denneau |first5 = Mikael |last5 = Granvik |first6 = Bryce |last6 = Bolin |first7 = Serge |last7 = Chastel |first8 = Richard J. |last8 = Wainscoat |first9 = William S. |last9 = Burgett |first10 = Kenneth C. |last10 = Chambers |first11 = Heather |last11 = Flewelling |first12 = Nick |last12 = Kaiser |first13 = Eugen A. |last13 = Magnier |first14 = Jeff S. |last14 = Morgan |first15 = Paul A. |last15 = Price |first16 = John L. |last16 = Tonry |first17 = Christopher |last17 = Waters |date = November 2015 |title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762|s2cid = 53493339 }}</ref>
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== 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 * [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center * {{AstDys|3640}} * {{JPL small body}}
{{Minor planets navigator |3639 Weidenschilling |number=3640 |3641 Williams Bay}} {{Small Solar System bodies}} {{Authority control}}
{{DEFAULTSORT:Gostin}} 003640 Category:Discoveries by Carolyn S. Shoemaker Category:Discoveries by Eugene Merle Shoemaker Category:Named minor planets 003640 19851011