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词条 4708 Polydoros
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 = 4708 Polydoros
| background = #C2FFFF
| image =
| image_size =
| caption =
| discovery_ref =  [1]
| discoverer = C. Shoemaker
| discovery_site = Palomar Obs.
| discovered = 11 September 1988
| mpc_name = (4708) Polydoros
| alt_names = 1988 RT
| pronounced = {{IPAc-en|ˌ|p|ɒ|l|iː|ˈ|d|ɔː|r|ə|s}}
{{Respell|POL|ee|DOR|əs}}
| named_after = Polydorus
{{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 = 29.70 yr (10,847 d)
| aphelion = 5.5674 AU
| perihelion = 4.9467 AU
| semimajor = 5.2570 AU
| eccentricity = 0.0590
| period = 12.05 yr (4,403 d)
| mean_anomaly = 123.79°
| mean_motion = {{Deg2DMS|0.0818|sup=ms}} / day
| inclination = 6.9857°
| asc_node = 281.17°
| arg_peri = 103.97°
| jupiter_moid = 0.019 AU
| tisserand = 2.9820
| mean_diameter = {{val|54.96|0.55|ul=km}}[8]
55.67 km {{small|(calculated)}}[9]
| rotation = {{val|7.517|0.001|ul=h}}[10]{{efn|name=lightcurve-plots-CS3}}
| albedo = {{val|0.057}} {{small|(assumed)}}[9]
{{val|0.064|0.005}}[8]
| spectral_type = D {{small|(Pan-STARRS)}}[9][14]
D {{small|(SDSS-MOC)}}[15]
B–V {{=}} {{val|0.770|0.060}}[16]
V–R {{=}} {{val|0.520|0.040}}[16]
V–I {{=}} {{val|0.960|0.040}}[9]
| abs_magnitude = 9.9[1][8]
10.0[9]
{{val|10.18|0.10}}[14]
}}4708 Polydoros ({{IPAc-en|ˌ|p|ɒ|l|iː|ˈ|d|ɔː|r|ə|s}} {{Respell|POL|ee|DOR|əs}}), provisional designation {{mp|1988 RT}}, is a Jupiter trojan from the Trojan camp, approximately {{convert|55|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 11 September 1988, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California.[1] The D-type asteroid belongs to the 80 largest Jupiter trojans and has a rotation period of 7.5 hours.[9] It was named after the Trojan prince Polydorus, from Greek mythology.[1]

Orbit and classification

Polydoros is a Jovian asteroid located in the {{L5}} Lagrangian point, 60° behind on Jupiter's orbit in the so-called Trojan camp {{cross reference|(see Trojans in astronomy)}}.[5] It is also a non-family asteroid of the Jovian background population.[6]

It orbits the Sun at a distance of 4.9–5.6 AU once every 12 years and 1 month (4,403 days; semi-major axis of 5.26 AU). Its orbit has an eccentricity of 0.06 and an inclination of 7° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Palomar in September 1988.[1]

Physical characteristics

In the SDSS-based taxonomy, Polydoros is a dark D-type asteroid.[15] It has also been characterized as a D-type by Pan-STARRS' survey.[9][14] Its V–I color index of 0.96 is typical for most larger D-type Jupiter trojans (see table below).[9]

Rotation period

In August 2011, a rotational lightcurve of Polydoros was obtained from photometric observations by Linda French at the Cerro Tololo Inter-American Observatory in Chile. Lightcurve analysis, however, gave an incorrect rotation period of {{val|20.03}} hours with a brightness variation of 0.25 magnitude ({{small|U=0}}).[9][36]

Several subsequent observations during 2014–2018 by Daniel Coley and Robert D. Stephens at the Center for Solar System Studies achieved a good period determination,[10][38]{{efn|name=lightcurve-plots-CS3}} with the best-rated one from November 2015, which gave a period of {{val|7.517|0.001}} hours and an amplitude of 0.17 magnitude ({{small|U=3}}).[9][10]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Polydoros measures 54.96 kilometers in diameter and its surface has an albedo of 0.064,[8] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057, and calculates a diameter of 55.67 kilometers based on an absolute magnitude of 10.0.[9]

{{Largest Jupiter trojans}}

Naming

This minor planet was named by the discoverer from Greek mythology after the Trojan prince Polydorus, the youngest and swiftest of King Priam's many sons. Although forbidden by his father, Polydoros confronted Achilles anyway, and was killed by him beside the River Scamander, near his brother Lycaon {{cross reference|(also see 4792 Lykaon)}}.[1] The official naming citation was published by the Minor Planet Center on 28 April 1991 ({{small|M.P.C. 18144}}).[44]

Notes

{{notelist|refs={{efn|name=lightcurve-plots-CS3|1=Lightcurve plots of (4708) Polydoros from 2014, 2015, 2017, and 2018, by Daniel Coley and 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 LCDB and CS3.}}

}}

References

1. ^1 2 3 4 5 6 7 8 {{cite web |title = 4708 Polydoros (1988 RT) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=4708 |accessdate = 18 June 2018}}
2. ^1 2 {{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 {{cite web |title = Asteroid (4708) Polydoros – Proper Elements |publisher = AstDyS-2, Asteroids – Dynamic Site |url = http://hamilton.dm.unipi.it/astdys/index.php?n=4708&pc=1.1.6 |access-date= 18 June 2018}}
6. ^1 2 {{Cite journal |first1 = J. M. |last1 = Carvano |first2 = P. H. |last2 = Hasselmann |first3 = D. |last3 = Lazzaro |first4 = T. |last4 = Mothé-Diniz |date = February 2010 |title = SDSS-based taxonomic classification and orbital distribution of main belt asteroids |url = https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_I0035_5_SDSSTAX_V1_1/data/sdsstax_ast_table.tab |journal = Astronomy and Astrophysics |volume = 510 |page = 12 |bibcode = 2010A&A...510A..43C |doi = 10.1051/0004-6361/200913322 |access-date= 18 June 2018}}
7. ^1 2 3 4 5 6 7 8 9 10 11 {{cite web |title = LCDB Data for (4708) Polydoros |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=4708%7CPolydoros |accessdate = 18 June 2018}}
8. ^1 {{Cite journal |first1 = Linda M. |last1 = French |first2 = Robert D. |last2 = Stephens |first3 = Daniel R. |last3 = Coley |first4 = Ralph |last4 = Megna |first5 = Lawrence H. |last5 = Wasserman |date = July 2012 |title = Photometry of 17 Jovian Trojan Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012MPBu...39..183F |journal = The Minor Planet Bulletin |volume = 39 |issue = 3 |pages = 183–187 |issn = 1052-8091 |bibcode = 2012MPBu...39..183F |access-date= 18 June 2018}}
9. ^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}}
10. ^1 2 3 {{Cite journal |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= 18 June 2018}}
11. ^1 2 3 {{cite journal |display-authors = 6 |first1 = Peter |last1 = Veres |first2 = Robert |last2 = Jedicke |first3 = Alan |last3 = Fitzsimmons |first4 = Larry |last4 = Denneau |first5 = Mikael |last5 = Granvik |first6 = Bryce |last6 = Bolin |first7 = Serge |last7 = Chastel |first8 = Richard J. |last8 = Wainscoat |first9 = William S. |last9 = Burgett |first10 = Kenneth C. |last10 = Chambers |first11 = Heather |last11 = Flewelling |first12 = Nick |last12 = Kaiser |first13 = Eugen A. |last13 = Magnier |first14 = Jeff S. |last14 = Morgan |first15 = Paul A. |last15 = Price |first16 = John L. |last16 = Tonry |first17 = Christopher |last17 = Waters |date = November 2015 |title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results |url = https://arxiv.org/pdf/1506.00762.pdf |journal = Icarus |volume = 261 |pages = 34–47 |bibcode = 2015Icar..261...34V |doi = 10.1016/j.icarus.2015.08.007 |arxiv = 1506.00762 |access-date= 18 June 2018}}
12. ^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]

}}

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=4708+Polydoros Asteroid 4708 Polydoros] at the Small Bodies Data Ferret
  • {{AstDys|4708}}
  • {{JPL small body|id=2004708}}
{{Use dmy dates|date=June 2018}}{{Minor planets navigator |4707 Khryses |number=4708 |4709 Ennomos}}{{Small Solar System bodies}}{{DEFAULTSORT:Polydoros}}

5 : Jupiter trojans (Trojan camp)|Discoveries by Carolyn S. Shoemaker|Minor planets named from Greek mythology|Named minor planets|Astronomical objects discovered in 1988
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