4867 Polites
Discovery [1] | |
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Discovered by | C. Shoemaker |
Discovery site | Palomar Obs. |
Discovery date | 27 September 1989 |
Designations | |
MPC designation | (4867) Polites |
Pronunciation | /pəˈlaɪtiːz/ · pə-LY-teez |
Named after | Polites (Greek mythology)[1] |
1989 SZ · 1988 RN1 | |
Jupiter trojan [1][2] Trojan [3] · background [4] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 29.69 yr (10,846 d) |
Aphelion | 5.2537 AU |
Perihelion | 5.0719 AU |
5.1628 AU | |
Eccentricity | 0.0176 |
11.73 yr (4,285 d) | |
282.98° | |
0° 5m 2.4s / day | |
Inclination | 27.164° |
335.20° | |
275.06° | |
Jupiter MOID | 0.1374 AU |
TJupiter | 2.7800 |
Physical characteristics | |
Mean diameter |
±0.79 km 57.25[5] ±1.82 km 64.29[6] ±7.0 km 65.16[7] |
±0.006 h 11.235[8][9][lower-alpha 1] | |
±0.009 0.071[5] ±0.018 0.0723[7] ±0.005 0.078[6] | |
C (assumed)[8] B–V = ±0.060 0.660[10] V–R = ±0.040 0.510[10] V–I = ±0.044 1.010[8] | |
9.40[6] 9.7[5] 9.8[1][2] | |
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4867 Polites (/pəˈlaɪtiːz/ pə-LY-teez), provisional designation 1989 SZ, is a Jupiter trojan from the Trojan camp, approximately 60 kilometers (37 miles) 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.[8] 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 . It is also a non-family asteroid of the Jovian background population.[4]
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.[2] The body's observation arc begins with its first observation as 1988 RN1 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).[8]
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 (U=2-).[8][11]
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.[9][12][13][14][lower-alpha 1] The best-rated one from January 2016 gave a period of ±0.006 hours and an amplitude of 0.15 magnitude ( 11.235U=3).[8][9]
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.[5][6][7] 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.[8]
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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 (M.P.C. 22248).[15]
Notes
References
- 1 2 3 4 5 6 7 8 "4867 Polites (1989 SZ)". Minor Planet Center. Retrieved 18 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 4867 Polites (1989 SZ)" (2018-05-22 last obs.). Jet Propulsion Laboratory. Retrieved 18 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 18 June 2018.
- 1 2 "Asteroid (4867) Polites – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 18 June 2018.
- 1 2 3 4 Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 18 June 2018. (online catalog)
- 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 18 June 2018. (online, AcuA catalog p. 153)
- 1 2 3 "Asteroid 4867 Polites". Small Bodies Data Ferret. Retrieved 18 June 2018.
- 1 2 3 4 5 6 7 8 "LCDB Data for (4867) Polites". Asteroid Lightcurve Database (LCDB). Retrieved 18 June 2018.
- 1 2 3 Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2016). "A Report from the L5 Trojan Camp - Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (3): 265–270. Bibcode:2016MPBu...43..265S. ISSN 1052-8091. Retrieved 18 June 2018.
- 1 2 Chatelain, Joseph P.; Henry, Todd J.; French, Linda M.; Winters, Jennifer G.; Trilling, David E. (June 2016). "Photometric colors of the brightest members of the Jupiter L5 Trojan cloud". Icarus. 271: 158–169. Bibcode:2016Icar..271..158C. doi:10.1016/j.icarus.2016.01.026. Retrieved 18 June 2016.
- ↑ French, Linda M.; Stephens, Robert D.; Lederer, Susan M.; Coley, Daniel R.; Rohl, Derrick A. (April 2011). "Preliminary Results from a Study of Trojan Asteroids". The Minor Planet Bulletin. 38 (2): 116–120. Bibcode:2011MPBu...38..116F. ISSN 1052-8091. Retrieved 18 June 2018.
- ↑ Stephens, Robert D.; French, Linda M.; Davitt, Chelsea; Coley, Daniel R. (April 2014). "At the Scaean Gates: Observations Jovian Trojan Asteroids, July- December 2013". The Minor Planet Bulletin. 41 (2): 95–100. Bibcode:2014MPBu...41...95S. ISSN 1052-8091. Retrieved 18 June 2018.
- ↑ Stephens, Robert D.; Coley, Daniel R. (July 2017). "Lightcurve Analysis of Trojan Asteroids at the Center for Solar System Studies 2017 January - March". The Minor Planet Bulletin. 44 (3): 252–257. Bibcode:2017MPBu...44..252S. ISSN 1052-8091. Retrieved 18 June 2018.
- ↑ Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2015). "Dispatches from the Trojan Camp - Jovian Trojan L5 Asteroids Observed from CS3: 2014 October - 2015 January". The Minor Planet Bulletin. 42 (3): 216–224. Bibcode:2015MPBu...42R.216S. ISSN 1052-8091. Retrieved 18 June 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 18 June 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Asteroid 4867 Polites at the Small Bodies Data Ferret
- 4867 Polites at AstDyS-2, Asteroids—Dynamic Site
- 4867 Polites at the JPL Small-Body Database