2223 Sarpedon
{{Use dmy dates|date=June 2018}}
{{Infobox planet
| minorplanet = yes
| name = 2223 Sarpedon
| background = #C2FFFF
| image =
| image_size =
| caption =
| discoverer = Purple Mountain Obs.
| discovery_site = Purple Mountain Obs.
| discovered = 4 October 1977
| mpc_name = (2223) Sarpedon
| alt_names = {{mp|1977 TL|3}}
| adjective = Sarpedontian
| pronounced = {{IPAc-en|s|ɑːr|ˈ|p|iː|d|ən}}Noah Webster (1884) A Practical Dictionary of the English Language
| named_after = {{nowrap|Sarpedon {{small|(Greek mythology)}}}}
| mp_category = Jupiter trojan
Trojan{{·}}background
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 40.63 yr (14,840 d)
| aphelion = 5.3172 AU
| perihelion = 5.1541 AU
| semimajor = 5.2357 AU
| eccentricity = 0.0156
| period = 11.98 yr (4,376 d)
| mean_anomaly = 266.05°
| mean_motion = {{Deg2DMS|0.0823|sup=ms}} / day
| inclination = 15.960°
| asc_node = 220.88°
| arg_peri = 52.434°
| jupiter_moid = 0.2369 AU
| tisserand = 2.9220
| mean_diameter = {{val|77.48|0.58|ul=km}}
{{val|94.63|4.0|u=km}}
{{val|108.21|6.15|u=km}}
| rotation = {{val|22.741|0.04|ul=h}}
{{val|22.77|0.04|ul=h}}
| albedo = {{val|0.027|0.003}}
{{val|0.0340|0.003}}
{{val|0.051|0.005}}
| spectral_type = Tholen {{=}} DU
U–B {{=}} 0.244
B–V {{=}} 0.778
B–V {{=}} {{val|0.753|0.032}}
B–V {{=}} {{val|0.740|0.050}}
V–R {{=}} {{val|0.465|0.025}}
V–R {{=}} {{val|0.440|0.030}}
V–I {{=}} {{val|0.905|0.033}}
V–I {{=}} {{val|0.880|0.038}}
}}
2223 Sarpedon {{IPAc-en|s|ɑːr|ˈ|p|iː|d|ən}} is a dark Jupiter trojan from the Trojan camp, approximately {{convert|90|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 4 October 1977, by astronomers at the Purple Mountain Observatory near Nanking, China. The D-type asteroid belongs to the 30 largest Jupiter trojans and has a rotation period of 22.7 hours. It was named after the Lycian hero Sarpedon from Greek mythology.
Orbit and classification
Sarpedon is orbiting in the trailing Trojan camp, at Jupiter's {{L5}} Lagrangian point, 60° behind its orbit in a 1:1 resonance {{crossreference|(also see Trojans in astronomy)}}. It is also a non-family asteroid of the Jovian background population.
It orbits the Sun at a distance of 5.2–5.3 AU once every 11 years and 12 months (4,376 days; semi-major axis of 5.24 AU). Its orbit has an eccentricity of 0.02 and an inclination of 16° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Nanking.
Physical characteristics
In the Tholen classification, Sarpedon is similar to a dark D-type asteroid, though with an unusual spectrum (DU).
= Rotation period =
In April 1996, a rotational lightcurve of Sarpedon was obtained from photometric observations by Italian astronomer Stefano Mottola at ESO's La Silla Observatory using the Bochum 0.61-metre Telescope. Lightcurve analysis gave a rotation period of 22.741 hours with a brightness amplitude of 0.14 magnitude ({{small|U=2+}}). A previous observation by Mottola gave a similar period of 22.77 hours from a lower-rated lightcurve ({{small|U=2}}).
= 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, Sarpedon measures between 77.48 and 108.21 kilometers in diameter and its surface has an albedo between 0.027 and 0.051.
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.034 and a diameter of 94.63 kilometers based on an absolute magnitude of 9.41.
{{Largest Jupiter trojans}}
Naming
This minor planet was named from Greek mythology after the Lycian hero Sarpedon from the Iliad, who was killed by Patroclus, {{MoMP|617|(617)}} during the Trojan War. The official naming citation was published by the Minor Planet Center on 1 August 1981 ({{small|M.P.C. 6208}}).
References
{{reflist|refs=
|type = 2017-03-30 last obs.
|title = JPL Small-Body Database Browser: 2223 Sarpedon (1977 TL3)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002223
|publisher = Jet Propulsion Laboratory
|access-date = 5 September 2017}}
|last = Schmadel | first = Lutz D.
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|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_2224 |chapter = (2223) Sarpedon }}
|title = 2223 Sarpedon (1977 TL3)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2223
|access-date = 5 September 2017}}
|title = List of Jupiter Trojans
|work = Minor Planet Center
|date = 30 May 2018
|url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html
|access-date = 12 June 2018}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
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|journal = The Astrophysical Journal
|volume = 759
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|bibcode = 2012ApJ...759...49G
|doi = 10.1088/0004-637X/759/1/49
|arxiv = 1209.1549
|s2cid = 119101711
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|title = Asteroid (2223) Sarpedon – Proper elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?n=2223&pc=1.1.6
|access-date = 5 June 2018}}
|title = Asteroid 2223 Sarpedon
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=2223+Sarpedon
|access-date = 12 June 2018}}
|title = LCDB Data for (2223) Sarpedon
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2223%7CSarpedon
|access-date = 5 September 2017}}
|display-authors = 6
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|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=
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|display-authors = 6
|first1 = Stefano |last1 = Mottola
|first2 = Mario |last2 = Di Martino
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|first4 = Maria |last4 = Gonano-Beurer
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|first6 = Uri |last6 = Carsenty
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|first1 = O. R. |last1 = Hainaut
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|first1 = Joseph P. |last1 = Chatelain
|first2 = Todd J. |last2 = Henry
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|doi-access= free
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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|2223}}
- {{JPL small body}}
{{Minor planets navigator |2222 Lermontov |number=2223 |2224 Tucson}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Sarpedon}}