2260 Neoptolemus
| Discovery | |
|---|---|
| Discovered by | Purple Mountain Observatory |
| Discovery date | 26 November 1975 |
| Designations | |
Named after | Neoptolemus |
| 1975 WM1 | |
| Jupiter Trojan | |
| Orbital characteristics[1][2] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 23451 days (64.21 yr) |
| Aphelion | 5.42028 AU (810.862 Gm) |
| Perihelion | 4.97010 AU (743.516 Gm) |
| 5.19519 AU (777.189 Gm) | |
| Eccentricity | 0.043326 |
| 11.84 yr (4325.15 d) | |
Average orbital speed | 13.07 km/s |
| 175.267° | |
| 0° 4m 59.643s / day | |
| Inclination | 17.7793° |
| 86.5736° | |
| 321.319° | |
| Earth MOID | 3.99814 AU (598.113 Gm) |
| Jupiter MOID | 0.0906179 AU (13.55624 Gm) |
| Jupiter Tisserand parameter | 2.903 |
| Physical characteristics | |
| Dimensions | 71.7 km |
Mean radius | 35.825 ± 1.7 km |
| Mass | 3.9×1017 kg |
Mean density | 2.0 g/cm³ |
Equatorial surface gravity | 0.0200 m/s² |
Equatorial escape velocity | 0.0379 km/s |
| 8.180 h (0.3408 d) | |
| 0.0650 ± 0.007 | |
| Temperature | ~122 K |
| 9.31 | |
|
| |
2260 Neoptolemus 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 Neoptolemus, the son of Achilles. It was discovered by the Purple Mountain Observatory in Nanjing, China on November 26, 1975.
Photometric observations of this asteroid during 2002 were used to build a light curve showing a rotation period of 8.180 ± 0.008 hours with a brightness variation of 0.32 ± 0.01 magnitude.[3]
References
- ↑ "The Asteroid Orbital Elements Database". astorb. Lowell Observatory.
- ↑ "2260 Neoptolemus (1975 WM1)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 11 April 2016.
- ↑ Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; Hahn, Gerhard; Schober, Hans-Josef; Lahulla, Felix; Delbò, Marco; Lagerkvist, Claes-Ingvar (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 170. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170.
External links
- Discovery Circumstances: Numbered Minor Planets
- Orbital simulation from JPL (Java) / Ephemeris
- 2260 Neoptolemus at the JPL Small-Body Database
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