2456 Palamedes
| Discovery[1] | |
|---|---|
| Discovered by | Purple Mountain Observatory |
| Discovery date | 30 January 1966 |
| Designations | |
| MPC designation | (2456) Palamedes |
| 1966 BA1 | |
| Jupiter Trojan | |
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 63.01 yr (23014 days) |
| Aphelion | 5.50783 AU (823.960 Gm) |
| Perihelion | 4.75165 AU (710.837 Gm) |
| 5.12974 AU (767.398 Gm) | |
| Eccentricity | 0.073706 |
| 11.62 yr (4243.66 d) | |
|
Average orbital speed
|
13.12 km/s |
| 157.743° | |
| 0° 5m 5.396s / day | |
| Inclination | 13.9075° |
| 327.393° | |
| 95.3858° | |
| Earth MOID | 3.80009 AU (568.485 Gm) |
| Jupiter MOID | 0.118209 AU (17.6838 Gm) |
| Jupiter Tisserand parameter | 2.937 |
| Physical characteristics | |
| Dimensions | 91.7 km |
|
Mean radius
|
45.83 ± 1.55 km |
| Mass | 8.1×1017 kg |
|
Mean density
|
2.0 g/cm³ |
|
Equatorial surface gravity
|
0.0256 m/s² |
|
Equatorial escape velocity
|
0.0485 km/s |
| 7.24 h (0.302 d) | |
| 0.0304 ± 0.002 | |
| Temperature | ~123 K |
| 9.3 | |
2456 Palamedes is a Jupiter Trojan asteroid that orbits in the L4 Lagrangian point of the Sun-Jupiter system, in the "Greek Camp" of Trojan asteroids. It was named after the Greek hero Palamedes. It was discovered by the Purple Mountain Observatory in Nanjing, China on January 30, 1966.
Photometric observations of this asteroid during 1995 were used to build a light curve showing a rotation period of 7.258 ± 0.004hours with a brightness variation of 0.05 ± 0.01 magnitude.
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