2357 Phereclos
Discovery [1] | |
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Discovered by | E. Bowell |
Discovery site | Anderson Mesa Stn. |
Discovery date | 1 January 1981 |
Designations | |
MPC designation | (2357) Phereclos |
Pronunciation | /fɪˈrɛkləs/ · fə-REK-ləs |
Named after |
Phereclos [1] (Greek mythology) |
1981 AC · 1929 SM 1959 EU · 1965 UQ1 1972 JP1 · 1976 SC1 1977 RM7 · 1978 VN16 | |
Jupiter trojan [1][2][3] Trojan [4][5] · background [5] | |
Orbital characteristics [2] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 88.31 yr (32,257 d) |
Aphelion | 5.4443 AU |
Perihelion | 4.9756 AU |
5.2099 AU | |
Eccentricity | 0.0450 |
11.89 yr (4,344 d) | |
279.81° | |
0° 4m 58.44s / day | |
Inclination | 2.6689° |
179.25° | |
74.175° | |
Jupiter MOID | 0.2303 AU |
TJupiter | 2.9960 |
Physical characteristics | |
Mean diameter |
±1.26 km 94.62[6] ±4.3 km 94.90[7] ±1.92 km 98.45[8] |
±0.01 h 7.16[lower-alpha 1] ±0.004 h 14.345[9][lower-alpha 2] ±0.020 h 14.394[10] ±0.02 h 14.49[11][lower-alpha 2] | |
±0.002 0.049[8] ±0.007 0.052[6] ±0.005 0.0521[7] | |
D (Tholen)[2][3] D (Pan-STARRS)[12] D (SDSS-MOC)[13][14] U–B = 0.237[2] B–V = ±0.050 0.890[15] V–R = ±0.030 0.470[15] V–I = ±0.012 0.960[3] | |
8.94[1][2][3][6][7][8] ±0.16 9.09[12] | |
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2357 Phereclos (/fɪˈrɛkləs/ fə-REK-ləs), provisional designation 1981 AC, is a large Jupiter trojan from the Trojan camp, approximately 95 kilometers (59 miles) in diameter. It was discovered on 1 January 1981, by American astronomer Edward Bowell at the Anderson Mesa Station near Flagstaff, Arizona, in the United States.[1] The dark and possibly spherical D-type asteroid belongs to the 30 largest Jupiter trojans and has a rotation period of 14.4 hours.[3] It was named after the shipbuilder Phereclos from Greek mythology.[1]
Orbit and classification
Cebriones is a dark Jovian asteroid orbiting in the trailering Trojan camp at Jupiter's L5 Lagrangian point, 60° behind on the Gas Giant's orbit in a 1:1 resonance (see Trojans in astronomy). This Jupiter trojan is also a non-family asteroid of the Jovian background population.[5][13]
It orbits the Sun at a distance of 5.0–5.4 AU once every 11 years and 11 months (4,344 days; semi-major axis of 5.21 AU). Its orbit has an eccentricity of 0.05 and an inclination of 3° with respect to the ecliptic.[2] The asteroid was first observed as 1929 SM at Lowell Observatory in September 1929. The body's observation arc begins at Lowell one month later with a precovery taken in October 1929, or more than 51 years prior to its official discovery observation at Anderson Mesa.[1]
Physical characteristics
Phereclos is a dark D-type asteroid, according to the Tholen classification, the SDSS-based taxonomy and the survey conducted by Pan-STARRS.[2][3][12][13][14]
Rotation period
In July 2010, a rotational lightcurve of Phereclos was obtained from photometric observations by Stefano Mottola using the 1.2-meter telescope at Calar Alto Observatory in Spain. Lightcurve analysis gave a rotation period of 14.394 hours with a low brightness variation of 0.09 magnitude (U=2+), indicative of a nearly spherical shape.[3][10]
Between 2010 and 2017, photometric follow-up observations by Robert Stephens at the Center for Solar System Studies, California, gave several, concurring periods of 7.16 (half-period), 14.345 and 14.49 hours.[3][9][11][lower-alpha 1][lower-alpha 2]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Phereclos measures between 94.62 and 98.45 kilometers in diameter and its surface has an albedo between 0.049 and 0.0521.[6][7][8]
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0521 and a diameter of 94.90 kilometers based on an absolute magnitude of 8.94.[3]
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Naming
This minor planet was named from Greek mythology after the skilled craftsman and shipbuilder Phereclos (Phereclus; Phereklos), who constructed the ship that Paris used to kidnap Helen. During the Trojan War, he was killed by the Greek hero Meriones.[1] The official naming citation was published by the Minor Planet Center on 1 August 1981 (M.P.C. 6208).[16]
Notes
- 1 2 Stephens (2011) web. Observation of (2357) Phereclos from 15 August 2010. Rotation period ±0.01 hours (i.e. half the period solution of the other observations) with a brightness amplitude of 7.16±0.02 mag. Quality code is 2. Summary figures at the 0.05LCDB.
- 1 2 3 Lightcurve plots of (2357) Phereclos from Jan 2016, Jan 2017 and Dec 2017/Jan 2018 by Robert Stephens at the Center for Solar System Studies (U81). Quality code is 3/3-/2 (lightcurve rating at CS3). Summary figures at the LCDB and CS3.
References
- 1 2 3 4 5 6 7 8 "2357 Phereclos (1981 AC)". Minor Planet Center. Retrieved 6 June 2018.
- 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 2357 Phereclos (1981 AC)" (2018-01-22 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2018.
- 1 2 3 4 5 6 7 8 9 "LCDB Data for (2357) Phereclos". Asteroid Lightcurve Database (LCDB). Retrieved 6 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 6 June 2018.
- 1 2 3 "Asteroid (2357) Phereclos". AstDyS-2, Asteroids – Dynamic Site. Retrieved 6 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" (PDF). The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 9 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 15 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 15 June 2018. (online, AcuA catalog p. 153)
- 1 2 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 6 June 2018.
- 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 6 June 2018.
- 1 2 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 6 June 2018.
- 1 2 3 Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results" (PDF). Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 6 June 2018.
- 1 2 3 "Asteroid 2357 Phereclos". Small Bodies Data Ferret. Retrieved 6 June 2018.
- 1 2 Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 15 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 9 June 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 6 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
- 2357 Phereclos at AstDyS-2, Asteroids—Dynamic Site
- 2357 Phereclos at the JPL Small-Body Database