5283 Pyrrhus
Discovery [1] | |
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Discovered by | C. Shoemaker |
Discovery site | Palomar Obs. |
Discovery date | 31 January 1989 |
Designations | |
MPC designation | (5283) Pyrrhus |
Pronunciation | /ˈpɪrəs/ · PIRR-əs |
Named after |
Pyrrhus / Neoptolemus [1] (Greek mythology) |
1989 BW · 1978 GF2 | |
Jupiter trojan [1][2] Greek [3] · background [4] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 66.54 yr (24,303 d) |
Aphelion | 5.9756 AU |
Perihelion | 4.4300 AU |
5.2028 AU | |
Eccentricity | 0.1485 |
11.87 yr (4,335 d) | |
219.73° | |
0° 4m 59.16s / day | |
Inclination | 17.479° |
71.160° | |
356.15° | |
Jupiter MOID | 0.6199 AU |
TJupiter | 2.8860 |
Physical characteristics | |
Mean diameter |
±0.42 km 48.36[5] ±5.0 km 64.58[6] ±3.30 km 69.93[7] |
±0.003 h 7.323[8] | |
±0.007 0.072[7] ±0.014 0.0807[6] ±0.013 0.100[5] | |
C (assumed)[9] V–I = ±0.042 0.950[9] | |
9.30[6][7] 9.7[1][2][5] | |
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5283 Pyrrhus (/ˈpɪrəs/ PIRR-əs), provisional designation 1989 BW, is a large Jupiter trojan from the Greek camp, approximately 65 kilometers (40 miles) in diameter. It was discovered on 31 January 1989, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California.[1] The dark Jovian asteroid belongs to the 100 largest Jupiter trojans and has a rotation period of 7.3 hours.[9] It was named after Achilles son, Neoptolemus (also called Pyrrhus) from Greek mythology.[1]
Orbit and classification
Pyrrhus is a dark Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance .[3] It is also a non-family asteroid in the Jovian background population.[4] It orbits the Sun at a distance of 4.4–6.0 AU once every 11 years and 10 months (4,335 days; semi-major axis of 5.2 AU). Its orbit has an eccentricity of 0.15 and an inclination of 17° with respect to the ecliptic.[2] The body's observation arc begins with a precovery taken at Palomar in November 1951, or more than 37 years prior to its official discovery observation.[1]
Physical characteristics
Pyrrhus is an assumed C-type asteroid, while most larger Jupiter trojans are D-type asteroids. It has a typical V–I color index of 0.95 (also see table).[9]
Rotation period
In September 1996, the first photometric observations Pyrrhus were obtained by Italian astronomer Stefano Mottola using the Bochum 0.61-metre Telescope at ESO's La Silla Observatory in Chile. The lightcurve however showed very little variation. Follow-up observation by Mottola at the Calar Alto Observatory with its 1.2-meter telescope in March 2002 gave a rotation period of ±0.003 hours with a brightness amplitude of 0.11 7.323magnitude (U=2).[8][9]
Diameter and albedo
According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, The Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, Pyrrhus measures between 48.36 and 69.93 kilometers in diameter and its surface has an albedo between 0.072 and 0.100.[5][6][7] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0564 and a diameter of 64.26 kilometers based on an absolute magnitude of 9.7.[9]
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Naming
This minor planet was named by the discoverer from Greek mythology after Achilles son Neoptolemus (see 2260 Neoptolemus) also known as Pyrrhus. His alternative name, Pyrrhus, origins from the yellow color of his hair. After his father's death, he was brought by Odysseus to the Trojan War, where he became the most ruthless of all the Greeks. He brutally killed King Priam and several other princes during the destruction of the city of Troy, and took away Hector's wife, Andromache, as his prize.[1]
The official naming citation was published by the Minor Planet Center on 4 June 1993 (M.P.C. 22250).[10]
References
- 1 2 3 4 5 6 7 8 "5283 Pyrrhus (1989 BW)". Minor Planet Center. Retrieved 21 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 5283 Pyrrhus (1989 BW)" (2018-05-23 last obs.). Jet Propulsion Laboratory. Retrieved 21 June 2018.
- 1 2 "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 21 June 2018.
- 1 2 "Asteroid (5283) Pyrrhus – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 21 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 21 June 2018. (online catalog)
- 1 2 3 4 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 21 June 2018.
- 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 21 June 2018. (online, AcuA catalog p. 153)
- 1 2 Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170. Retrieved 21 June 2018.
- 1 2 3 4 5 6 "LCDB Data for (5283) Pyrrhus". Asteroid Lightcurve Database (LCDB). Retrieved 21 June 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 21 June 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- Asteroid 5283 Pyrrhus at the Small Bodies Data Ferret
- 5283 Pyrrhus at AstDyS-2, Asteroids—Dynamic Site
- 5283 Pyrrhus at the JPL Small-Body Database