216 Kleopatra
| Discovery | |
|---|---|
| Discovered by | J. Palisa |
| Discovery site | Pola Obs. |
| Discovery date | 10 April 1880 |
| Designations | |
| (216) Kleopatra | |
| Pronunciation | /ˌkliəˈpætrə/ |
Named after | Cleopatra (Egyptian queen) |
| A880 GB · 1905 OA 1910 RA | |
| main-belt · (central) background | |
| Adjectives | Kleopatrian, Kleopatrean |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 137.60 yr (50,259 d) |
| Aphelion | 3.4951 AU |
| Perihelion | 2.0931 AU |
| 2.7941 AU | |
| Eccentricity | 0.2509 |
| 4.67 yr (1,706 d) | |
| 346.24° | |
| 0° 12m 39.6s / day | |
| Inclination | 13.113° |
| 215.36° | |
| 180.11° | |
| Known satellites | 2 (Alexhelios · Cleoselene) |
| Physical characteristics | |
| Dimensions | (276 × 94 × 78) ± 15% km |
| 118±2 km 122±30 km 103±4 km 121.6±1.6 km 135±2 km | |
| Flattening | 0.82 |
| Mass | (3.0±0.3)×1018 kg (2.97±0.02)×1018 kg |
Mean density | 3.45±0.41 g/cm3 ca. 4.5 g/cm3 (most likely between 3.6±0.4 g/cm3 for D = 135 km and 5.4±0.4 g/cm3 for D = 109 km) |
| 5.385280±0.000001 h | |
| 0.152 (calculated) 0.1164±0.004 0.170 0.149±0.005 0.1111±0.0336 0.1068 0.200±0.028 | |
| M (Tholen) · Xe (SMASS) M B–V = 0.713 U–B = 0.238 | |
| 7.30 7.09 7.35±0.02 7.45 | |
216 Kleopatra is a large M-type asteroid with a mean diameter of 120 kilometers (75 miles) and is noted for its elongate bone or dumbbell shape. It was discovered on 10 April 1880 by Austrian astronomer Johann Palisa at the Austrian Naval Pola Observatory, in what is now Pula, Croatia, and was named after Cleopatra VII, the famous Egyptian queen. It has two small minor-planet moons which were discovered in 2008 and later named Alexhelios and Cleoselene.