2146 Stentor
{{Short description|Minor planet}}
{{Use dmy dates|date=June 2018}}
{{Infobox planet
| minorplanet = yes
| name = 2146 Stentor
| background = #C2FFFF
| image =
| image_size =
| caption =
| discoverer = R. M. West
| discovery_site = La Silla Obs.
| discovered = 24 October 1976
| mpc_name = (2146) Stentor
| alt_names = 1976 UQ
| adjective = Stentorian
| pronounced = {{IPAc-en|ˈ|s|t|ɛ|n|t|ər}}{{·}}{{Cite encyclopedia |url=http://www.lexico.com/definition/stentor |archive-url=https://web.archive.org/web/20200322190020/https://www.lexico.com/definition/stentor |url-status=dead |archive-date=22 March 2020 |title=stentor |dictionary=Lexico UK English Dictionary |publisher=Oxford University Press}}
| named_after = Stentor
{{small|(Greek mythology)}}
| mp_category = Jupiter trojan
{{nowrap|Greek {{·}}background }}
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 40.93 yr (14,949 d)
| aphelion = 5.7217 AU
| perihelion = 4.6714 AU
| semimajor = 5.1965 AU
| eccentricity = 0.1011
| period = 11.85 yr (4,327 d)
| mean_anomaly = 238.48°
| mean_motion = {{Deg2DMS|0.0832|sup=ms}} / day
| inclination = 39.261°
| asc_node = 131.32°
| arg_peri = 273.11°
| jupiter_moid = 0.0831 AU
| tisserand = 2.5410
| mean_diameter = {{val|50.76|0.33|ul=km}}
{{val|58.29|u=km}} {{small|(calculated)}}
| rotation = {{val|16.40|0.02|ul=h}}{{efn|name=lightcurve-plots-CS3}}
| albedo = {{val|0.057}} {{small|(assumed)}}
{{val|0.082|0.011}}
| spectral_type = C {{small|(assumed)}}
}}
2146 Stentor {{IPAc-en|ˈ|s|t|ɛ|n|t|ər}} is a Jupiter trojan from the Greek camp, approximately {{convert|51|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 24 October 1976, by Danish astronomer Richard Martin West at the ESO's La Silla Observatory in Chile. The dark Jovian asteroid has a rotation period of 16.4 hours and belongs to the 100 largest Jupiter trojans. It was named after Stentor from Greek mythology, a Herald of the Greeks during the Trojan War.
Orbit and classification
Stentor is a Jovian asteroid orbiting in the leading Greek camp at Jupiter's {{L4}} Lagrangian point, 60° ahead of the gas giant's orbit in a 1:1 resonance {{crossreference|(see Trojans in astronomy)}}. It is a non-family asteroid in the Jovian background population.
It orbits the Sun at a distance of 4.7–5.7 AU once every 11 years and 10 months (4,327 days; semi-major axis of 5.2 AU). Its orbit has an eccentricity of 0.10 and an inclination of 39° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at La Silla in October 1976.
Physical characteristics
Stentor is an assumed C-type asteroid.
= Rotation period =
In June 2016, a rotational lightcurve of Stentor was obtained from photometric observations by Brian Warner at the Center for Solar System Studies (CS3) in California. Lightcurve analysis gave a rotation period of {{val|16.40|0.02}} hours with a brightness amplitude of 0.10 magnitude ({{small|U=2}}). An alternative period solution (1:1.5 alias of 24.88 was also obtained.{{efn|name=lightcurve-plots-CS3}}
Stentor was previously observed at CS3 by Daniel Coley and Robert Stephens in February 2013, gave an alternative period solution of {{val|35.14|0.02}} hours with an amplitude of 0.09 magnitude. This approximately a 1:2 alias is now superseded by the shorter period above ({{small|U=2}}).
= Diameter and albedo =
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Stentor measures 50.76 kilometers in diameter and its surface has an albedo 0.082, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 58.29 kilometers based on an absolute magnitude of 9.9.
{{Largest Jupiter trojans}}
Naming
This minor planet was named from Greek mythology after Stentor, the Greek warrior and herald with a voice as loud as fifty men together. The official {{MoMP|2146|naming citation}} was published by the Minor Planet Center on 1 July 1979 ({{small|M.P.C. 4788}}).
Notes
{{notelist|refs=
{{efn|name=lightcurve-plots-CS3|1=Lightcurve plots of (2146) Stentor from [http://www.planetarysciences.org/plots/DC/2146_STENTOR_20130119.BMP Jan 2013] (DC), [http://www.planetarysciences.org/plots/RDS/2146_STENTOR_2013-01-19.PNG Feb 2013] (RDS), [http://www.planetarysciences.org/plots/BDW/2146_STENTOR_20160605.PNG Jun 2016] (BDW) by Daniel Coley (DC) Robert Stephens (RDS) and Brian Warner (BDW) at the Center for Solar System Studies {{Obscode|U81}}. Quality code is 3/3- (lightcurve rating at CS3). Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2146%7CStentor LCDB] and [http://www.planetarysciences.org/PHP/CS3_Lightcurves.php CS3].}}
}}
References
{{reflist|30em|refs=
|type = 2017-09-28 last obs.
|title = JPL Small-Body Database Browser: 2146 Stentor (1976 UQ)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2002146
|publisher = Jet Propulsion Laboratory
|access-date = 19 June 2018}}
|title = 2146 Stentor (1976 UQ)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2146
|access-date = 19 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 = 19 June 2018}}
|title = Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008)
|year = 2009
|url = https://archive.org/details/dictionaryminorp2008schm
|url-access = limited
|chapter = Appendix – Publication Dates of the MPCs
|last = Schmadel |first=Lutz D.
|publisher = Springer Berlin Heidelberg
|page = [https://archive.org/details/dictionaryminorp2008schm/page/n230 221]
|isbn = 978-3-642-01964-7
|doi = 10.1007/978-3-642-01965-4|bibcode = 2009dmpn.book.....S
}}
|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
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759...49G
|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
|access-date= 19 June 2018}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-6?-source=J/ApJ/759/49/table1&MPC=02146 online catalog])
|title = Asteroid (2146) Stentor – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?n=2146&pc=1.1.6
|access-date= 19 June 2018}}
|title = LCDB Data for (2146) Stentor
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2146%7CStentor
|access-date = 19 June 2018}}
|first1 = Linda M. |last1 = French
|first2 = Robert, D. |last2 = Stephens
|first3 = Daniel R. |last3 = Coley
|first4 = Lawrence H. |last4 = Wasserman
|first5 = Faith |last5 = Vilas
|first6 = Daniel |last6 = La Rocca
|date = October 2013
|title = A Troop of Trojans: Photometry of 24 Jovian Trojan Asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40..198F
|journal = The Minor Planet Bulletin
|volume = 40
|issue = 4
|pages = 198–203
|issn = 1052-8091
|bibcode = 2013MPBu...40..198F
|access-date= 19 June 2018}}
|first1 = Robert D. |last1 = Stephens
|first2 = Daniel R. |last2 = Coley
|first3 = Brian D. |last3 = Warner
|first4 = Linda, M. |last4 = French
|date = October 2016
|title = Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies: L4 Greek Camp and Spies
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43..323S
|journal = The Minor Planet Bulletin
|volume = 43
|issue = 4
|pages = 323–331
|issn = 1052-8091
|bibcode = 2016MPBu...43..323S
|access-date= 19 June 2018}}
}}
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
- [https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=2146+Stentor Small Bodies Data Ferret] at the Asteroid 2146 Stentor
- {{AstDys|2146}}
- {{JPL small body}}
{{Minor planets navigator |2145 Blaauw |number=2146 |2147 Kharadze}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Stentor}}