4715 Medesicaste
{{Use dmy dates|date=June 2018}}
{{Infobox planet
| minorplanet = yes
| name = 4715 Medesicaste
| background = #C2FFFF
| image = 004715-asteroid shape model (4715) 1989 TS1.png
| image_scale =
| caption = Shape model of Medesicaste from its lightcurve
| discoverer = Y. Oshima
| discovery_site = Gekko Obs.
| discovered = 9 October 1989
| mpc_name = (4715) Medesicaste
| alt_names = {{mp|1989 TS|1}}{{·}}{{mp|1972 GL|1}}
1983 DF
| adjective = Medesicastean
| pronounced =
| named_after = Medesicaste
{{small|(Greek mythology)}}
| mp_category = Jupiter trojan
{{nowrap|Trojan{{·}}background}}
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 63.62 yr (23,236 d)
| aphelion = 5.3591 AU
| perihelion = 4.8598 AU
| semimajor = 5.1094 AU
| eccentricity = 0.0489
| period = 11.55 yr (4,218 d)
| mean_anomaly = 180.77°
| mean_motion = {{Deg2DMS|0.0853|sup=ms}} / day
| inclination = 18.658°
| asc_node = 1.6077°
| arg_peri = 345.36°
| jupiter_moid = 0.0924 AU
| tisserand = 2.8940
| mean_diameter = {{val|62.10|0.43|ul=km}}
{{val|65.93|1.80|u=km}}
| rotation = {{val|8.8129|0.0025|ul=h}}
| albedo = {{val|0.060|0.010}}
{{val|0.079|0.005}}
| spectral_type = C {{small|(assumed)}}
B–V {{=}} {{val|0.680|0.060}}
V–R {{=}} {{val|0.430|0.040}}
V–I {{=}} {{val|0.850|0.030}}
}}
4715 Medesicaste (prov. designation: {{mp|1989 TS|1}}) is a dark Jupiter trojan from the Trojan camp, approximately {{convert|64|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 9 October 1989, by Japanese astronomer Yoshiaki Oshima at the Gekko Observatory east of Shizuoka, Japan. The assumed C-type asteroid belongs to the 70 largest Jupiter trojans. It is possibly elongated in shape and has a rotation period of 8.8 hours. It was named from Greek mythology after Medesicaste, an illegitimate daughter of Trojan King Priam.
Orbit and classification
Medesicaste is orbiting in the trailering Trojan camp, at Jupiter's {{L5}} Lagrangian point, 60° behind the Gas Giant's 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 4.9–5.4 AU once every 11 years and 7 months (4,218 days; semi-major axis of 5.11 AU). Its orbit has an eccentricity of 0.05 and an inclination of 19° with respect to the ecliptic. The body's observation arc begins with a precovery taken at Palomar Observatory in October 1954, or 35 years prior to its official discovery observation at Gekko.
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 30 January 1991 ({{small|M.P.C. 17619}}). On 14 May 2021, the object was named by the Working Group for Small Bodies Nomenclature (WGSBN), after Medesicaste from Greek mythology, who was an illegitimate daughter of King Priam and wife of Imbrius.
Before Medesicaste was named, it belonged to a small group of only 8 unnamed minor planets with a designated number smaller than 5000. (All of them are Jupiter trojans or near-Earth asteroids). Since then, several have already been named :
{{Div col|colwidth=25em}}
- 3708 Socus {{mp|(3708) 1974 FV|1}} – named in May 2021
- 4035 Thestor {{mp|(4035) 1986 WD}} – named in May 2021
- 4489 Dracius {{mp|(4489) 1988 AK}} – named in May 2021
- {{mpl|(4596) 1981 QB}}
- {{mpl|(4688) 1980 WF}}
- 4715 Medesicaste {{mp|(4715) 1989 TS|1}} – named in May 2021
- 4835 Asaeus {{mp|(4835) 1989 BQ}}
- {{mpl|(4953) 1990 MU}}
{{Div col end}}
Physical characteristics
Medesicaste is an assumed C-type asteroid. It has a V–I color index of 0.85, slightly below that seen for most Jovian D-type asteroids (also seen table below).
= Rotation period =
A rotational lightcurve of Medesicaste was first obtained by Stefano Mottola in November 1991, using the Loiano 1.52-meter telescope at Bologna Observatory in Italy. Lightcurve analysis gave a rotation period of {{val|8.8129|0.0025}} hours with a brightness amplitude of 0.46 magnitude ({{small|U=3}}). In September 2012, it was also observed in the R-band by astronomers at the Palomar Transient Factory in California ({{small|U=2}}).
Since January 2015, several photometric observations by Robert Stephens at the Center for Solar System Studies in California confirmed Mottola's period determination from 1991, and measured a brightness amplitude of 0.50–0.53, which is indicative of a non-spherical, possibly elongated shape ({{small|U=3-/3-/3}}).{{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, Medesicaste measures between 62.10 and 65.93 kilometers in diameter and its surface has an albedo between 0.060 and 0.079. It has not been observed by the Supplemental IRAS Minor Planet Survey. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 63.91 kilometers based on an absolute magnitude of 9.7.
{{Largest Jupiter trojans}}
Notes
{{notelist|refs=
{{efn|name=lightcurve-plots-CS3|1=Lightcurve plots of (4715) 1989 TS1 from [http://www.planetarysciences.org/plots/RDS/4715_1989TS1_2015-01-01.PNG Jan 2015], [http://www.planetarysciences.org/plots/RDS/4715_1989TS1_2015-12-24.PNG Dec 2015], [http://www.planetarysciences.org/plots/RDS/4715_1989TS1_20170223.PNG Feb 2017] and [http://www.planetarysciences.org/plots/RDS/4715_1989TS1_20180220.PNG 2018] by Robert Stephens at the Center for Solar System Studies {{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=4715%7C1989+TS1 LCDB] and [http://www.planetarysciences.org/PHP/CS3_Lightcurves.php CS3].}}
}}
References
{{reflist|30em|refs=
|type = 2018-05-19 last obs.
|title = JPL Small-Body Database Browser: 4715 (1989 TS1)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004715
|publisher = Jet Propulsion Laboratory
|accessdate = 14 June 2018}}
|title = 4715 (1989 TS1)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=4715
|accessdate = 14 June 2018}}
|title = List of Jupiter Trojans
|work = Minor Planet Center
|date = 30 May 2018
|url = https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html
|accessdate = 14 June 2018}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 14 June 2018}}
|title = WGSBN Bulletin Archive
|work = Working Group for Small Bodies Nomenclature
|date = 14 May 2021
|url = https://www.wgsbn-iau.org/files/Bulletins/index.html
|accessdate = 16 May 2021}} ([https://www.wgsbn-iau.org/files/Bulletins/V001/WGSBNBull_V001_001.pdf Bulletin #1])
|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=04715 online catalog])
|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
|volume = 12
|pages = IRAS-A-FPA-3-RDR-IMPS-V6.0
|bibcode = 2004PDSS...12.....T
|accessdate = 19 March 2020}}
|title = Asteroid (884) Priamus – Proper elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?n=884&pc=1.1.6
|accessdate = 13 June 2018}}
|title = Asteroid (4715) 1989 TS1
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=4715
|accessdate = 14 June 2018}}
|title = LCDB Data for (4715)
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=4715
|accessdate = 14 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=
}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=4715 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])
|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
}}
|last1 = Stephens
|first1 = Robert D.
|last2 = Coley
|first2 = Daniel R.
|date = July 2017
|title = Lightcurve Analysis of Trojan Asteroids at the Center for Solar System Studies 2017 January - March
|journal = Minor Planet Bulletin
|url = http://www.minorplanet.info/MPB/issues/MPB_44-3.pdf
|volume = 44
|issue = 3
|pages = 252–257
|pmid = 32455404
|pmc = 7243922
|bibcode = 2017MPBu...44..252S
|issn = 1052-8091
|accessdate = 19 March 2020
|archive-date = 23 February 2020
|archive-url = https://web.archive.org/web/20200223221729/http://www.minorplanet.info/MPB/issues/MPB_44-3.pdf
|url-status = dead
}}
|first1 = Joseph P. |last1 = Chatelain
|first2 = Todd J. |last2 = Henry
|first3 = Linda M. |last3 = French
|first4 = Jennifer G. |last4 = Winters
|first5 = David E. |last5 = Trilling
|date = June 2016
|title = Photometric colors of the brightest members of the Jupiter L5 Trojan cloud
|journal = Icarus
|volume = 271
|pages = 158–169
|bibcode = 2016Icar..271..158C
|doi = 10.1016/j.icarus.2016.01.026|doi-access= free
}}
}}
External links
- [http://www.minorplanet.info/PHP/OneAsteroidInfo.php Lightcurve Database Query] (LCDB), at www.minorplanet.info
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|4715}}
- {{JPL small body}}
{{Minor planets navigator |4714 Toyohiro |number=4715 |4716 Urey}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Medesicaste}}