11509 Thersilochos
{{Use dmy dates|date=June 2018}}
{{Infobox planet
| minorplanet = yes
| name = 11509 Thersilochos
| background = #C2FFFF
| image =
| image_size =
| caption =
| discoverer = E. W. Elst
| discovery_site = La Silla Obs.
| discovered = 15 November 1990
| mpc_name = (11509) Thersilochos
| alt_names = {{mp|1990 VL|6}}{{·}}{{mp|1989 SN|7}}
{{mp|1989 VM|5}}
| adjective = Thersilochian
| pronounced = {{IPAc-en|θ|ər|ˈ|s|ɪ|l|ə|k|ə|s}}Noah Webster (1884) A Practical Dictionary of the English Language
| named_after = Thersilochus
{{small|(Greek mythology)}}
| mp_category = Jupiter trojan
{{nowrap|Trojan{{·}}background}}
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 28.64 yr (10,462 d)
| aphelion = 5.9165 AU
| perihelion = 4.4429 AU
| semimajor = 5.1797 AU
| eccentricity = 0.1422
| period = 11.79 yr (4,306 d)
| mean_anomaly = 182.56°
| mean_motion = {{Deg2DMS|0.0836|sup=ms}} / day
| inclination = 18.502°
| asc_node = 214.70°
| arg_peri = 128.51°
| jupiter_moid = 0.0868 AU
| tisserand = 2.8780
| mean_diameter = {{val|49.96|0.76|u=km}}
{{val|56.23|4.79|u=km}}
| rotation = {{val|17.367|0.015|u=h}}
| albedo = {{val|0.051|0.009}}
{{val|0.065|0.010}}
| spectral_type = C {{small|(assumed)}}
| abs_magnitude = 10.10
{{val|10.270|0.004}} {{small|(R)}}
}}
11509 Thersilochos {{IPAc-en|θ|ər|ˈ|s|ɪ|l|ə|k|ə|s}} is a Jupiter trojan from the Trojan camp, approximately {{convert|50|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 15 November 1990, by Belgian astronomer Eric Elst at the La Silla Observatory in northern Chile. The dark Jovian asteroid belongs to the 100 largest Jupiter trojans and has a rotation period of 17.4 hours. It was named after the Trojan warrior Thersilochus from Greek mythology.
Orbit and classification
Thersilochos is a dark Jovian asteroid in a 1:1 orbital resonance with Jupiter. It is located in the trailering Trojan camp at the Gas Giant's {{L5}} Lagrangian point, 60° behind its orbit {{crossreference|(see Trojans in astronomy)}}. It is also a non-family asteroid of the Jovian background population. It orbits the Sun at a distance of 4.4–5.9 AU once every 11 years and 9 months (4,306 days; semi-major axis of 5.18 AU). Its orbit has an eccentricity of 0.14 and an inclination of 19° with respect to the ecliptic.
The body's observation arc begins with its first observation as {{mp|1989 SN|7}} at Palomar Observatory in September 1989, just two months prior to its official discovery observation at La Silla.
Physical characteristics
Thersilochos is an assumed C-type asteroid, while the majority of the larger Jovian asteroids are D-types.
= Rotation period =
In July 2007, a rotational lightcurve of Thersilochos was obtained from a total of six nights of photometric observations by Italian astronomer Stefano Mottola at the Calar Alto Observatory in Spain. Lightcurve analysis gave a well-defined rotation period of {{val|17.367|0.015}} hours with a brightness variation of 0.27 magnitude ({{small|U=3}}).
Follow-up observations in the R-band by astronomers at the Palomar Transient Factory in November 2013, and by Daniel Coley at the Center for Solar System Studies in December 2014, gave two concurring periods of 17.329 and 17.389 hours ({{small|U=3/2}}).{{efn|name=lightcurve-plots-CS3}}
= 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, Thersilochos between 49.96 and 56.23 kilometers in diameter and its surface has an albedo of 0.065 and 0.051, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 53.16 kilometers based on an absolute magnitude of 10.1.
{{Largest Jupiter trojans}}
Naming
This minor planet was named from Greek mythology after the Trojan warrior Thersilochus, who fought with Hector at the battle for the dead body of Patroclus and was later slain by Achilles. The official naming citation was published by the Minor Planet Center on 6 January 2003 ({{small|M.P.C. 47299}}).
Notes
{{notelist|refs=
{{efn|name=lightcurve-plots-CS3|1=Lightcurve plots of (11509) Thersilochos from [http://www.planetarysciences.org/plots/DC/11509_THERSILOCHOS_2014-12-23.PNG Dec 2014] by Daniel Coley at the Center for Solar System Studies {{Obscode|U80}}. Quality code is 3- (lightcurve rating at CS3). Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=11509%7CThersilochos LCDB] and [http://www.planetarysciences.org/PHP/CS3_Lightcurves.php CS3].}}
}}
References
{{reflist|30em|refs=
|type = 2018-05-22 last obs.
|title = JPL Small-Body Database Browser: 11509 Thersilochos (1990 VL6)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011509
|publisher = Jet Propulsion Laboratory
|access-date = 20 June 2018}}
|title = 11509 Thersilochos (1990 VL6)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=11509
|access-date = 20 June 2018}}
|title = List of Jupiter Trojans
|work = Minor Planet Center
|first3 = V. |last3 = Carruba
|date = 1 June 2018
|url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html
|access-date = 20 June 2018}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 20 June 2018}}
|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=11509 online catalog])
|title = Asteroid (11509) Thersilochos – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?n=11509&pc=1.1.6
|access-date= 20 June 2018}}
|title = LCDB Data for (11509) Thersilochos
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=11509%7CThersilochos
|access-date = 20 June 2018}}
|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= free
}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=11509 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])
|first1 = Robert D. |last1 = Stephens
|first2 = Daniel R. |last2 = Coley
|first3 = Linda M. |last3 = French
|date = July 2015
|title = Dispatches from the Trojan Camp - Jovian Trojan L5 Asteroids Observed from CS3: 2014 October - 2015 January
|journal = The Minor Planet Bulletin
|volume = 42
|issue = 3
|pages = 216–224
|issn = 1052-8091
|bibcode = 2015MPBu...42R.216S}}
|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 }}
|display-authors = 6
|first1 = Stefano |last1 = Mottola
|first2 = Mario |last2 = Di Martino
|first3 = Anders |last3 = Erikson
|first4 = Maria |last4 = Gonano-Beurer
|first5 = Albino |last5 = Carbognani
|first6 = Uri |last6 = Carsenty
|first7 = Gerhard |last7 = Hahn
|first8 = Hans-Josef |last8 = Schober
|first9 = Felix |last9 = Lahulla
|first10 = Marco |last10 = Delbò
|first11 = Claes-Ingvar |last11 = Lagerkvist
|date = May 2011
|title = Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects
|journal = The Astronomical Journal
|volume = 141
|issue = 5
|page = 32
|bibcode = 2011AJ....141..170M
|doi = 10.1088/0004-6256/141/5/170|doi-access= free
}}
}}
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/NumberedMPs010001.html Discovery Circumstances: Numbered Minor Planets (10001)-(15000)] – Minor Planet Center
- [https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=11509+Thersilochos Asteroid 11509 Thersilochos] {{Webarchive|url=https://web.archive.org/web/20180620181155/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=11509+Thersilochos |date=20 June 2018 }} at the Small Bodies Data Ferret
- {{AstDys|11509}}
- {{JPL small body}}
{{Minor planets navigator |11508 Stolte |number=11509 |11510 Borges}}
{{Small Solar System bodies}}
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