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词条 4867 Polites
释义

  1. Orbit and classification

  2. Physical characteristics

      Rotation period    Diameter and albedo  

  3. Naming

  4. Notes

  5. References

  6. External links

{{Infobox planet
| minorplanet = yes
| name = 4867 Polites
| background = #C2FFFF
| image =
| image_size =
| caption =
| discovery_ref =  [1]
| discoverer = C. Shoemaker
| discovery_site = Palomar Obs.
| discovered = 27 September 1989
| mpc_name = (4867) Polites
| alt_names = 1989 SZ{{·}}{{mp|1988 RN|1}}
| pronounced = {{IPAc-en|p|ə|ˈ|l|aɪ|t|iː|z}}{{·}}{{Respell|pə|LY|teez}}
| named_after = {{nowrap|Polites {{small|(Greek mythology)}}[1]}}
| mp_category = Jupiter trojan [1]
{{nowrap|Trojan [5]{{·}}background [6]}}
| orbit_ref =  
| epoch = 23 March 2018 (JD 2458200.5)
| uncertainty = 0
| observation_arc = 29.69 yr (10,846 d)
| aphelion = 5.2537 AU
| perihelion = 5.0719 AU
| semimajor = 5.1628 AU
| eccentricity = 0.0176
| period = 11.73 yr (4,285 d)
| mean_anomaly = 282.98°
| mean_motion = {{Deg2DMS|0.0840|sup=ms}} / day
| inclination = 27.164°
| asc_node = 335.20°
| arg_peri = 275.06°
| jupiter_moid = 0.1374 AU
| tisserand = 2.7800
| mean_diameter = {{val|57.25|0.79|ul=km}}[8]
{{val|64.29|1.82|u=km}}[9]
{{val|65.16|7.0|u=km}}[10]
| rotation = {{val|11.235|0.006|u=h}}[11][12]{{efn|name=lightcurve-plots-CS3}}
| albedo = {{val|0.071|0.009}}[8]
{{val|0.0723|0.018}}[10]
{{val|0.078|0.005}}[9]
| spectral_type = C {{small|(assumed)}}[11]
B–V {{=}} {{val|0.660|0.060}}[17]
V–R {{=}} {{val|0.510|0.040}}[17]
V–I {{=}} {{val|1.010|0.044}}[11]
| abs_magnitude = 9.40[9]
9.7[8]
9.8[1]
}}4867 Polites ({{IPAc-en|p|ə|ˈ|l|aɪ|t|iː|z}} {{Respell|pə|LY|teez}}), provisional designation {{mp|1989 SZ}}, is a Jupiter trojan from the Trojan camp, approximately {{convert|60|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 27 September 1989, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California.[1] The dark Jovian asteroid belongs to the 80 largest Jupiter trojans and has a rotation period of 11.2 hours.[11] It was named after the Trojan prince Polites from Greek mythology.[1]

Orbit and classification

Polites 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 {{cross reference|(see Trojans in astronomy)}}. It is also a non-family asteroid of the Jovian background population.[6]

It orbits the Sun at a distance of 5.1–5.3 AU once every 11 years and 9 months (4,285 days; semi-major axis of 5.16 AU). Its orbit has an eccentricity of 0.02 and an inclination of 27° with respect to the ecliptic. The body's observation arc begins with its first observation as {{mp|1988 RN|1}} at Palomar in September 1988, or one year prior to its official discovery observation.[1]

Physical characteristics

Polites is an assumed C-type asteroid. Its V–I color index of 1.01 is one of the highest among the larger Jupiter trojans (see table below).[11]

Rotation period

In August 2010, a rotational lightcurve of Polites was obtained from photometric observations over five nights by Linda French at the Cerro Tololo Inter-American Observatory in Chile. Lightcurve analysis gave a tentative rotation period of 9.21 hours with a low brightness variation of 0.09 magnitude ({{small|U=2-}}).[11][32]

Follow-up observations on a yearly basis by Robert D. Stephens and Daniel Coley at the Center for Solar System Studies gave several lightcurves during 2013–2018.[12][34][35][36]{{efn|name=lightcurve-plots-CS3}} The best-rated one from January 2016 gave a period of {{val|11.235|0.006}} hours and an amplitude of 0.15 magnitude ({{small|U=3}}).[11][12]

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite, the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, and the Infrared Astronomical Satellite IRAS, Polites measures between 57.25 and 65.16 kilometers in diameter and its surface has an albedo between 0.071 and 0.078.[8][9][10] 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.[11]

{{Largest Jupiter trojans}}

Naming

This minor planet was named by the discoverer from Greek mythology after the Trojan prince Polites, son of King Priam and Hecuba. He was killed with a spear handled by Achille's son Neoptolemus (Pyrrhus), who was the most ruthless of the Greeks. During the fall of Troy, he invaded Priam's great house and chased Polites until he cornered and slaughtered him in front of his parents.[1]

The official naming citation was published by the Minor Planet Center on 4 June 1993 ({{small|M.P.C. 22248}}).[44]

Notes

{{notelist|refs={{efn|name=lightcurve-plots-CS3|1=Lightcurve plots of (4867) Polites from Aug 2013 (DC), Aug 2013 (RDS), 2014, 2016, 2017, 2018, by Daniel Coley and Robert Stephens at the Center for Solar System Studies {{Obscode|U81}}. Quality code is 3-/2/3-/3/2+/3 (lightcurve rating at CS3). Summary figures at the LCDB and CS3.}}

}}

References

1. ^1 2 3 4 5 6 7 8 {{cite web |title = 4867 Polites (1989 SZ) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=4867 |accessdate = 18 June 2018}}
2. ^1 {{cite web |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 |accessdate = 18 June 2018}}
3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 18 June 2018}}
4. ^1 2 3 4 {{cite journal |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 |access-date= 18 June 2018}} (online catalog)
5. ^1 2 3 {{cite web |title = Asteroid 4867 Polites |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=4867+Polites |accessdate = 18 June 2018}}
6. ^1 2 {{cite web |title = Asteroid (4867) Polites – Proper Elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = http://hamilton.dm.unipi.it/astdys/index.php?n=4867&pc=1.1.6 |access-date= 18 June 2018}}
7. ^1 2 3 4 5 6 7 8 {{cite web |title = LCDB Data for (4867) Polites |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=4867%7CPolites |accessdate = 18 June 2018}}
8. ^1 2 3 4 {{cite journal |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 |url = http://pasj.oxfordjournals.org/content/63/5/1117.full.pdf+html |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 |access-date= 18 June 2018}} (online, [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])
9. ^1 {{Cite journal |first1 = Robert D. |last1 = Stephens |first2 = Linda M. |last2 = French |first3 = Chelsea |last3 = Davitt |first4 = Daniel R. |last4 = Coley |date = April 2014 |title = At the Scaean Gates: Observations Jovian Trojan Asteroids, July- December 2013 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41...95S |journal = The Minor Planet Bulletin |volume = 41 |issue = 2 |pages = 95–100 |issn = 1052-8091 |bibcode = 2014MPBu...41...95S |access-date= 18 June 2018}}
10. ^1 {{Cite journal |first1 = Linda M. |last1 = French |first2 = Robert D. |last2 = Stephens |first3 = Susan M. |last3 = Lederer |first4 = Daniel R. |last4 = Coley |first5 = Derrick A. |last5 = Rohl |date = April 2011 |title = Preliminary Results from a Study of Trojan Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011MPBu...38..116F |journal = The Minor Planet Bulletin |volume = 38 |issue = 2 |pages = 116–120 |issn = 1052-8091 |bibcode = 2011MPBu...38..116F |access-date= 18 June 2018}}
11. ^1 {{Cite journal |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 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42R.216S |journal = The Minor Planet Bulletin |volume = 42 |issue = 3 |pages = 216–224 |issn = 1052-8091 |bibcode = 2015MPBu...42R.216S |access-date= 18 June 2018}}
12. ^1 2 3 {{Cite journal |first1 = Robert D. |last1 = Stephens |first2 = Daniel R. |last2 = Coley |first3 = Linda M. |last3 = French |date = July 2016 |title = A Report from the L5 Trojan Camp - Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43..265S |journal = The Minor Planet Bulletin |volume = 43 |issue = 3 |pages = 265–270 |issn = 1052-8091 |bibcode = 2016MPBu...43..265S |access-date= 18 June 2018}}
13. ^1 {{Cite journal |first1 = Robert D. |last1 = Stephens |first2 = Daniel R. |last2 = Coley |date = July 2017 |title = Lightcurve Analysis of Trojan Asteroids at the Center for Solar System Studies 2017 January - March |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2017MPBu...44..252S |journal = The Minor Planet Bulletin |volume = 44 |issue = 3 |pages = 252–257 |issn = 1052-8091 |bibcode = 2017MPBu...44..252S |access-date= 18 June 2018}}
14. ^1 2 {{Cite journal |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 |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016Icar..271..158C |journal = Icarus |volume = 271 |pages = 158–169 |bibcode = 2016Icar..271..158C |doi = 10.1016/j.icarus.2016.01.026 |access-date= 18 June 2016}}
[1][2][3][4][5][6][7][8][9][10][11][12][13][14]

}}

External links

  • Asteroid Lightcurve Database (LCDB), query form (info)
  • [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
  • Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
  • [https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=4867+Polites Asteroid 4867 Polites] at the Small Bodies Data Ferret
  • {{AstDys|4867}}
  • {{JPL small body}}
{{Use dmy dates|date=June 2018}}{{Minor planets navigator |4866 Badillo |number=4867 |4868 Knushevia }}{{Small Solar System bodies}}{{DEFAULTSORT:Polites}}

5 : Jupiter trojans (Trojan camp)|Discoveries by Carolyn S. Shoemaker|Minor planets named from Greek mythology|Named minor planets|Astronomical objects discovered in 1989
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