2797 Teucer

{{Short description|Trojan asteroid}} {{Use dmy dates|date=June 2018}} {{Infobox planet | minorplanet = yes | name = 2797 Teucer | background = #C2FFFF | image = | image_size = | caption = | discovery_ref = <ref name="MPC-object" /> | discoverer = E. Bowell | discovery_site = Anderson Mesa Stn. | discovered = 4 June 1981 | mpc_name = (2797) Teucer | alt_names = 1981 LK{{·}}1940 YG {{mp|1975 VA|1}}{{·}}{{mp|1975 XQ|2}} 1978 EQ | adjective = Teucerian (Teucrian) | pronounced = {{IPAc-en|ˈ|tj|uː|s|ər}}<ref>Noah Webster (1884) ''A Practical Dictionary of the English Language''</ref> | named_after = Teucer {{small|(Greek mythology)}}<ref name="MPC-object" /> | mp_category = Jupiter trojan<ref name="MPC-object" /><ref name="jpldata" /><ref name="lcdb" /> {{nowrap|Greek<ref name="MPC-Jupiter-Trojans" /><ref name="AstDys-object" />{{·}}background<ref name="AstDys-object" />}} | orbit_ref = <ref name="jpldata" /> | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 77.40 yr (28,272 d) | aphelion = 5.5519 AU | perihelion = 4.6574 AU | semimajor = 5.1046 AU | eccentricity = 0.0876 | period = 11.53 yr (4,213 d) | mean_anomaly = 173.90° | mean_motion = {{Deg2DMS|0.0855|sup=ms}} / day | inclination = 22.391° | asc_node = 69.934° | arg_peri = 49.042° | jupiter_moid = 0.0174 AU | tisserand = 2.8440 | dimensions = {{val|114.0|x|114|u=km}} {{small|(occ.)}}<ref name="Ferret" /> | mean_diameter = {{val|89.43|0.75|ul=km}}<ref name="Grav-2012" /> {{val|111.14|4.1|u=km}}<ref name="SIMPS" /> {{val|113.99|2.78|u=km}}<ref name="AKARI" /> | rotation = {{val|10.145|0.001|u=h}}<ref name="French-2011b" />{{efn|name=lightcurve-plots-Stephens-Coley}} | albedo = {{val|0.059|0.003}}<ref name="AKARI" /> {{val|0.0624|0.005}}<ref name="SIMPS" /> {{val|0.073|0.007}}<ref name="Grav-2012" /> | spectral_type = D {{small|(Pan-STARRS)}}<ref name="lcdb" /><ref name="Veres-2015" /> D {{small|(SDSS-MOC)}}<ref name="Ferret" /><ref name="SDSS-Taxonomy" /> V–I {{=}} {{val|0.920|0.045}}<ref name="lcdb" /> | abs_magnitude = 8.40<ref name="SIMPS" /><ref name="AKARI" /> 8.7<ref name="MPC-object" /><ref name="jpldata" /><ref name="Grav-2012" /> }}

'''2797 Teucer''' {{IPAc-en|ˈ|tj|uː|s|ər}} is a large Jupiter trojan from the Greek camp, approximately {{convert|110|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 4 June 1981, by American astronomer Edward Bowell at the Anderson Mesa Station near Flagstaff, Arizona, in the United States.<ref name="MPC-object" /> The dark D-type asteroid belongs to the 20 largest Jupiter trojans and has a rotation period of 10.15 hours.<ref name="lcdb" /> It was named after the Greek hero and great archer, Teucer.<ref name="MPC-object" />

== Orbit and classification ==

''Teucer'' is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's {{L4}} Lagrangian point, 60° ahead of its orbit in a 1:1 resonance {{crossreference|(see Trojans in astronomy)}}. It is also a non-family asteroid in the Jovian background population.<ref name="AstDys-object" />

It orbits the Sun at a distance of 4.7–5.6 AU once every 11 years and 6 months (4,213 days; semi-major axis of 5.1 AU). Its orbit has an eccentricity of 0.09 and an inclination of 22° with respect to the ecliptic.<ref name="jpldata" />

The body's observation arc begins with its first observation as ''{{mp|1940 YG}}'' at Turku Observatory in December 1940, more than 40 years prior to its official discovery observation at Anderson Mesa.<ref name="MPC-object" />

== Naming ==

This minor planet was named after the Greek hero Teucer, from Greek mythology. The son of King Telamon was a great archer and half-brother of Ajax, with whom he fought alongside in the Trojan War.<ref name="MPC-object" /> The official naming citation was published by the Minor Planet Center on 17 February 1984 ({{small|M.P.C. 8543}}).<ref name="MPC-Circulars-Archive" />

== Physical characteristics ==

''Teucer'' has been characterized as a dark D-type asteroid by Pan-STARRS' survey as well as in the SDSS-based taxonomy.<ref name="Veres-2015" /><ref name="SDSS-Taxonomy" /> It is also an assumed C-type asteroid.<ref name="lcdb" />

=== Rotation period ===

Several rotational lightcurves of ''Teucer'' have been obtained from photometric observations since 1992.<ref name="French-2011b" /><ref name="geneva-obs" /><ref name="Stephens-2016b" /><ref name="Stephens-2014f" /><ref name="Binzel-1992a" /> Analysis of the best-rated lightcurve from September 2010, by Daniel Coley at the Center for Solar System Studies {{Obscode|U80}} gave a well-defined rotation period of {{val|10.145|0.001}} hours with a brightness amplitude of 0.20 magnitude ({{small|U=3}}).<ref name="lcdb" /><ref name="French-2011b" />{{efn|name=lightcurve-plots-Stephens-Coley}}

=== Diameter and albedo ===

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ''Teucer'' measures between 89.43 and 113.99 kilometers in diameter and its surface has an albedo between 0.059 and 0.073.<ref name="Grav-2012" /><ref name="SIMPS" /><ref name="AKARI" />

The ''Collaborative Asteroid Lightcurve Link'' derives an albedo of 0.0435 and a diameter of 110.72 kilometers based on an absolute magnitude of 8.8.<ref name="lcdb" /> In June 2014, an observed asteroid occultation gave a cross-section of {{val|114.0|x|114.0|u=km}} (poor fit).<ref name="Ferret" />

== Notes == {{notelist|refs=

{{efn|name=lightcurve-plots-Stephens-Coley|1=Lightcurve plots of (2797) Teucer from [http://www.planetarysciences.org/plots/DC/2797_TEUCER_2010-09-11.BMP 2010], [http://www.planetarysciences.org/plots/DC/2797_TEUCER_2014-03-19.PNG 2014-A], [http://www.planetarysciences.org/plots/RDS/2797_TEUCER_2014-03-15.PNG 2014-B] and [http://www.planetarysciences.org/plots/RDS/2797_TEUCER_2015-04-03.PNG 2015] by Daniel Coley and/or Robert Stephens at the Center for Solar System Studies {{Obscode|U80}} and {{Obscode|U81}}. Quality code is 3/3-/3/3 (lightcurve rating at CS3). Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2797%7CTeucer LCDB] and [http://www.planetarysciences.org/PHP/CS3_Lightcurves.php CS3].}}

}}

== References == {{reflist|30em|refs=

<ref name="jpldata">{{cite web |type = 2018-05-25 last obs. |title = JPL Small-Body Database Browser: 2797 Teucer (1981 LK) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002797 |publisher = Jet Propulsion Laboratory |access-date = 5 June 2018}}</ref>

<ref name="MPC-object">{{cite web |title = 2797 Teucer (1981 LK) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2797 |access-date = 5 June 2018}}</ref>

<ref name="MPC-Jupiter-Trojans">{{cite web |title = List of Jupiter Trojans |work = Minor Planet Center |date = 30 May 2018 |url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html |access-date = 5 June 2018}}</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 = 5 June 2018}}</ref>

<ref name="geneva-obs">{{cite web |title = Asteroids and comets rotation curves – (2797) Teucer |last = Behrend |first = Raoul |publisher = Geneva Observatory |url = http://obswww.unige.ch/~behrend/page4cou.html#002797 |access-date = 5 June 2018}}</ref>

<ref name="Grav-2012">{{cite journal |first1 = T. |last1 = Grav |first2 = A. K. |last2 = Mainzer |first3 = J. M. |last3 = Bauer |first4 = J. R. |last4 = Masiero |first5 = C. R. |last5 = Nugent |date = November 2012 |title = WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy |journal = The Astrophysical Journal |volume = 759 |issue = 1 |page = 10 |bibcode = 2012ApJ...759...49G |doi = 10.1088/0004-637X/759/1/49 |arxiv = 1209.1549 |s2cid = 119101711 }} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-6?-source=J/ApJ/759/49/table1&MPC=02797 online catalog])</ref>

<ref name="AstDys-object">{{cite web |title = Asteroid (2797) Teucer – Proper elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = https://newton.spacedys.com/astdys/index.php?n=2797&pc=1.1.6 |access-date = 5 June 2018}}</ref>

<ref name="Ferret">{{cite web |title = Asteroid 2797 Teucer |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=2797+Teucer |access-date = 5 June 2018}}</ref>

<ref name="SDSS-Taxonomy">{{Cite journal |first1 = J. M. |last1 = Carvano |first2 = P. H. |last2 = Hasselmann |first3 = D. |last3 = Lazzaro |first4 = T. |last4 = Mothé-Diniz |date = February 2010 |title = SDSS-based taxonomic classification and orbital distribution of main belt asteroids |url = https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab |journal = Astronomy and Astrophysics |volume = 510 |page = 12 |bibcode = 2010A&A...510A..43C |doi = 10.1051/0004-6361/200913322 |access-date= 30 October 2019|doi-access= free }} [https://sbn.psi.edu/pds/resource/sdsstax.html (PDS data set)]</ref>

<ref name="lcdb">{{cite LCDB|number = 2797 |access-date = 5 June 2018}}</ref>

<ref name="SIMPS">{{cite journal |first1 = E. F. |last1 = Tedesco |first2 = P. V. |last2 = Noah |first3 = M. |last3 = Noah |first4 = S. D. |last4 = Price |date = October 2004 |title = IRAS Minor Planet Survey V6.0 |url = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab |journal = NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0 |volume = 12 |pages = IRAS-A-FPA-3-RDR-IMPS-V6.0 |bibcode = 2004PDSS...12.....T |access-date = 15 June 2018}}</ref>

<ref name="AKARI">{{cite journal |display-authors = 6 |first1 = Fumihiko |last1 = Usui |first2 = Daisuke |last2 = Kuroda |first3 = Thomas G. |last3 = Müller |first4 = Sunao |last4 = Hasegawa |first5 = Masateru |last5 = Ishiguro |first6 = Takafumi |last6 = Ootsubo |first7 = Daisuke |last7 = Ishihara |first8 = Hirokazu |last8 = Kataza |first9 = Satoshi |last9 = Takita |first10 = Shinki |last10 = Oyabu |first11 = Munetaka |last11 = Ueno |first12 = Hideo |last12 = Matsuhara |first13 = Takashi |last13 = Onaka |date = October 2011 |title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey |journal = Publications of the Astronomical Society of Japan |volume = 63 |issue = 5 |pages = 1117–1138 |bibcode = 2011PASJ...63.1117U |doi = 10.1093/pasj/63.5.1117 |doi-access= }} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=2797 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])</ref>

<ref name="Binzel-1992a">{{Cite journal |first1 = Richard P. |last1 = Binzel |first2 = Linda M. |last2 = Sauter |date = February 1992 |title = Trojan, Hilda, and Cybele asteroids - New lightcurve observations and analysis |journal = Icarus |volume = 95 |issue = 2 |pages = 222–238 |issn = 0019-1035 |bibcode = 1992Icar...95..222B |doi = 10.1016/0019-1035(92)90039-A }}</ref>

<ref name="French-2011b">{{Cite journal |first1 = Linda M. |last1 = French |first2 = Robert D. |last2 = Stephens |first3 = Susan M. |last3 = Lederer |first4 = Daniel R. |last4 = Coley |first5 = Derrick A. |last5 = Rohl |date = April 2011 |title = Preliminary Results from a Study of Trojan Asteroids |journal = The Minor Planet Bulletin |volume = 38 |issue = 2 |pages = 116–120 |issn = 1052-8091 |bibcode = 2011MPBu...38..116F }}</ref>

<ref name="Stephens-2016b">{{Cite journal |first1 = Robert D. |last1 = Stephens |first2 = Daniel, R. |last2 = Coley |first3 = Linda M. |last3 = French |date = January 2016 |title = Large L5 Jovian Trojan Asteroid Lightcurves from the Center for Solar System Studies |journal = The Minor Planet Bulletin |volume = 43 |issue = 1 |pages = 15–22 |issn = 1052-8091 |bibcode = 2016MPBu...43...15S }}</ref>

<ref name="Stephens-2014f">{{Cite journal |first1 = Robert D. |last1 = Stephens |first2 = Daniel R. |last2 = Coley |first3 = Linda M. |last3 = French |date = October 2014 |title = Trojan Asteroids Observed from CS3: 2014 January–May |journal = The Minor Planet Bulletin |volume = 41 |issue = 4 |pages = 210–212 |issn = 1052-8091 |bibcode = 2014MPBu...41..210S }}</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>

}}

== 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|2797}} * {{JPL small body}}

{{Minor planets navigator |2796 Kron |number=2797 |2798 Vergilius}} {{Small Solar System bodies}} {{Authority control}}

{{DEFAULTSORT:Teucer}} 002797 Category:Discoveries by Edward L. G. Bowell Category:Named minor planets 19810604