Global Information152830 Dinkinesh information
 Dinkinesh and its satellite Selam imaged by the Lucy spacecraft's L'LORRI camera | |
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab ETS |
| Discovery date | 4 November 1999 |
| Designations | |
MPC designation | (152830) Dinkinesh |
| Pronunciation | /ˈdɪŋkɪnɛʃ/ |
Named after | Dinkʼinesh (Lucy fossil) |
Alternative designations | 1999 VD57 · 2004 HJ78 · 2007 CB63[2] |
Minor planet category | main-belt[1] · (inner) |
| Orbital characteristics [1] | |
| Epoch 25 February 2023 (JD 2460000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 23.06 yr (8,422 days) |
| Earliest precovery date | 15 October 1999 |
| Aphelion | 2.437 AU |
| Perihelion | 1.946 AU |
Semi-major axis | 2.191 AU |
| Eccentricity | 0.1120 |
Orbital period (sidereal) | 3.24 yr (1,185 days) |
Mean anomaly | 25.239° |
Mean motion | 0° 18m 13.874s / day |
| Inclination | 2.094° |
Longitude of ascending node | 21.380° |
Argument of perihelion | 66.711° |
| Known satellites | 1 |
| Physical characteristics | |
Mean diameter | 790 m (primary)[3] |
Synodic rotation period | 52.67±0.04 h[4][5] (satellite orbital period?)[citation needed] |
Geometric albedo | 0.27+0.25 −0.06[6] |
Spectral type | Sq[7][8] V–R = 0.455±0.025[5] |
Absolute magnitude (H) | 17.62±0.04 (V-band)[7][5]: L3 |
152830 Dinkinesh (provisional designation 1999 VD57) is a binary main-belt asteroid about 790 meters (2,600 feet) in diameter. It was discovered by the Lincoln Near-Earth Asteroid Research (LINEAR) survey at Socorro, New Mexico on 4 November 1999. Dinkinesh, the name borrowed from an Ethiopian word for the Lucy fossil, was the first flyby target of NASA's Lucy mission, which approached 425 km (264 mi) from the asteroid on 1 November 2023.[9] During the flyby, the Lucy spacecraft discovered that Dinkinesh has a contact-binary natural satellite, named Selam, which is 220 meters (720 ft) in diameter. Dinkinesh is the smallest main-belt asteroid explored by spacecraft yet, though some smaller near-Earth asteroids have also been explored.
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