6002 Eetion
{{Use dmy dates|date=November 2021}}
{{Infobox planet
| minorplanet = yes
| name = 6002 Eetion
| background = #C2FFFF
| image =
| image_size =
| caption =
| discoverer = P. Jensen
| discovery_site = Brorfelde Obs.
| discovered = 8 September 1988
| mpc_name = (6002) Eetion
| alt_names = 1988 RO
| pronounced =
| named_after = Eetion
{{small|(Greek mythology)}}
| mp_category = Jupiter trojan
{{nowrap|Trojan{{·}}background}}
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 64.68 yr (23,624 d)
| aphelion = 5.7007 AU
| perihelion = 4.7464 AU
| semimajor = 5.2235 AU
| eccentricity = 0.0914
| period = 11.94 yr (4,361 d)
| mean_anomaly = 163.01°
| mean_motion = {{Deg2DMS|0.0826|sup=ms}} / day
| inclination = 15.556°
| asc_node = 209.71°
| arg_peri = 159.55°
| jupiter_moid = 0.1867 AU
| tisserand = 2.9190
| mean_diameter = {{val|40.41|0.47|ul=km}}
| rotation = {{val|12.918|0.022|ul=h}}
| albedo = {{val|0.075|0.009}}
| spectral_type = C {{small|(assumed)}}
| abs_magnitude = 10.4
10.5
10.6
}}
6002 Eetion, provisional designation: {{mp|1988 RO}}, is a mid-sized Jupiter trojan from the Trojan camp, approximately {{convert|40|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered by Poul Jensen at the Brorfelde Observatory in 1988, and has not been named since its numbering in June 1994. The dark Jovian asteroid has a rotation period of 12.9 hours. In 2021, it was named from Greek mythology after King Eetion, who was killed by Achilles during the raid on Thebe.
Discovery
Eetion discovered on 8 September 1988, by Danish astronomer Poul Jensen at the Brorfelde Observatory near Holbæk, Denmark, who on very same night also discovered the Jupiter trojan {{mpl|(5119) 1988 RA|1}}, and several other main-belt asteroids including {{LoMP|9840|{{mp|(9840) 1988 RQ|2}}}}, {{LoMP|12689|{{mp|(12689) 1988 RO|2}}}}, {{mpl|(14364) 1988 RM|2}}, {{LoMP|14837|{{mp|(14837) 1988 RN|2}}}}, and {{LoMP|24664|{{mp|(24664) 1988 RB|1}}}}.
Orbit and classification
Eetion 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 4.7–5.7 AU once every 11 years and 11 months (4,361 days; semi-major axis of 5.22 AU). Its orbit has an eccentricity of 0.09 and an inclination of 16° with respect to the ecliptic. A first precovery was taken at Palomar Observatory in September 1953, extending the body's observation arc by 35 years prior to its official discovery observation at Brorfelde.
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 23 June 1994 ({{small|M.P.C. 23661}}). On 29 November 2021, IAU's Working Group for Small Bodies Nomenclature {{MoMP|6002|named}} it from Greek mythology after King Eetion of Thebe Hypoplakia, father of Andromache, and father-in-law of Hector. Eetion was killed during the raid on Thebe by Achilles.
Physical characteristics
This Jupiter trojan is an assumed, carbonaceous C-type asteroid.
= Rotation period =
In February 1993, Eetion was observed by astronomers Stefano Mottola and Mario Di Martino with the ESO 1-metre telescope and its DLR MkII CCD-camera at La Silla in Chile. The photometric observations were used to build a lightcurve showing a rotation period of {{val|12.918|0.022}} hours with a brightness variation of {{val|0.18|0.01}} magnitude ({{small|U=3-}}). It was the body's first determined rotation period in literature.{{rp|29}}
= Diameter and albedo =
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Eetion measures 40.4 kilometers in diameter and its surface has an albedo of 0.075, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 42.23 kilometers, based on an absolute magnitude of 10.6.
{{Largest Jupiter trojans}}
References
{{reflist|30em|refs=
|type = 2018-05-22 last obs.
|title = JPL Small-Body Database Browser: 6002 (1988 RO)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2006002
|publisher = Jet Propulsion Laboratory
|access-date= 22 June 2018}}
|title = 6002 (1988 RO)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=6002
|access-date= 22 June 2018}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date= 22 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= 22 June 2018}}
|title = WGSBN Bulletin Archive
|work = Working Group for Small Bodies Nomenclature
|date = 29 November 2021
|url = https://www.wgsbn-iau.org/files/Bulletins/index.html
|access-date= 29 November 2021}} ([https://www.wgsbn-iau.org/files/Bulletins/V001/WGSBNBull_V001_012.pdf Bulletin #12])
|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=06002 online catalog])
|title = Asteroid (6002) 1988 RO – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?n=6002&pc=1.1.6
|access-date= 22 June 2018}}
|title = LCDB Data for (6002)
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=6002%7C
|access-date= 22 June 2018}}
|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://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center
- [https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=6002 Asteroid (6002) 1988 RO] at the Small Bodies Data Ferret
- {{AstDys|6002}}
- {{JPL small body}}
{{Minor planets navigator |6001 Thales |number=6002 |(6003) 1988 VO1}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Eetion}}