2456 Palamedes
Discovery [1] | |
---|---|
Discovered by | Purple Mountain Obs. |
Discovery site | Purple Mountain Obs. |
Discovery date | 30 January 1966 |
Designations | |
MPC designation | (2456) Palamedes |
Pronunciation |
/ˌpæləˈmiːdiːz/ PAL-ə-MEE-deez |
Named after |
Palamedes [2] (Greek mythology) |
1966 BA1 · 1973 TJ 1977 AK1 · 1979 EF | |
Jupiter trojan [1][3][4] Greek [5][6] · background [6] | |
Orbital characteristics [3] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 65.27 yr (23,840 d) |
Aphelion | 5.5085 AU |
Perihelion | 4.7526 AU |
5.1306 AU | |
Eccentricity | 0.0737 |
11.62 yr (4,245 d) | |
226.28° | |
0° 5m 5.28s / day | |
Inclination | 13.910° |
327.36° | |
94.829° | |
Jupiter MOID | 0.1189 AU |
TJupiter | 2.9370 |
Physical characteristics | |
Mean diameter |
±0.51 km 65.92[7] ±3.1 km 91.66[8] km 91.83(derived)[4] ±4.11 km 99.60[9] |
±0.01 h 7.24[10] ±0.004 h 7.258[11] | |
±0.002 0.026[9] ±0.002 0.0304[8] 0.0399(derived)[4] ±0.010 0.071[7] | |
C (assumed)[4] | |
9.3[1][3][4] 9.4[7] ±0.29 9.43[12] 9.60[9] | |
|
2456 Palamedes (/ˌpæləˈmiːdiːz/ PAL-ə-MEE-deez), provisional designation 1966 BA1, is a large Jupiter trojan from the Greek camp, approximately 90 kilometers (56 miles) in diameter. It was discovered on 30 January 1966, by astronomers at the Purple Mountain Observatory in Nanking, China.[1] The assumed C-type asteroid has a rotation period of 7.24 hours and belongs to the 50 largest Jupiter trojans.[4] It was named after Palamedes from Greek mythology.[2]
Orbit and classification
Palamedes 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 (see Trojans in astronomy). It is also a non-family asteroid in the Jovian background population.[6][13]
It orbits the Sun at a distance of 4.8–5.5 AU once every 11 years and 7 months (4,245 days; semi-major axis of 5.13 AU). Its orbit has an eccentricity of 0.07 and an inclination of 14° with respect to the ecliptic.[3] The body's observation arc begins with a precovery taken at Palomar Observatory in February 1953, nearly 13 years prior to its official discovery observation at Nanking.[1]
Physical characteristics
Palamedes is an assumed, carbonaceous C-type asteroid.[4]
Rotation period
In August 1995, a rotational lightcurve of Palamedes was obtained from photometric observations by Stefano Mottola and Hans-Josef Schober using the now decommissioned Bochum 0.61-metre Telescope at ESO's La Silla Observatory in Chile. Lightcurve analysis gave a rotation period of 7.258 hours and a brightness variation of 0.05 magnitude (U=2-).[4][11]
A more refined period of 7.24 hours with an amplitude of 0.27 margnitude was obtained by Robert Stephens at the Goat Mountain Astronomical Research Station (G79) in October 2009 (U=3).[4][10]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Palamedes measures between 65.92 and 99.60 kilometers in diameter and its surface has an albedo between 0.026 and 0.071.[7][8][9]
The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0399 and a diameter of 91.83 kilometers based on an absolute magnitude of 9.3.[4]
|
|
Naming
This minor planet was named from Greek mythology after Palamedes, the most intelligent of all the Greek commanders of the Trojan War.[2] The official naming citation was published by the Minor Planet Center on 28 January 1983 (M.P.C. 7618).[14]
References
- 1 2 3 4 5 "2456 Palamedes (1966 BA1)". Minor Planet Center. Retrieved 6 June 2018.
- 1 2 3 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2456) Palamedes. Springer Berlin Heidelberg. p. 200. ISBN 978-3-540-00238-3. Retrieved 6 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 2456 Palamedes (1966 BA1)" (2018-05-25 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2018.
- 1 2 3 4 5 6 7 8 9 10 "LCDB Data for (2456) Palamedes". Asteroid Lightcurve Database (LCDB). Retrieved 6 June 2018.
- ↑ "List of Jupiter Trojans". Minor Planet Center. 30 May 2018. Retrieved 5 June 2018.
- 1 2 3 "Asteroid (2456) Palamedes – Proper elements". 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 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. (April 2010). "Trojan Asteroids Observed from GMARS and Santana Observatories: 2009 October - December". The Minor Planet Bulletin. 37 (2): 47–48. Bibcode:2010MPBu...37...47S. 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.
- ↑ 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.
- ↑ "Asteroid 2456 Palamedes". Small Bodies Data Ferret. Retrieved 6 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
- 2456 Palamedes at AstDyS-2, Asteroids—Dynamic Site
- 2456 Palamedes at the JPL Small-Body Database