120347 Salacia
Keck Telescope image of Salacia (bright, center) and its moon Actaea (faint, at left) | |
| Discovery | |
|---|---|
| Discovered by | H. G. Roe M. E. Brown K. M. Barkume |
| Discovery site | Palomar Obs. |
| Discovery date | 22 September 2004 |
| Designations | |
| (120347) Salacia | |
| Pronunciation | /səˈleɪʃə/ (sə-LAY-shə) |
Named after | Salacia (Roman mythology) |
| 2004 SB60 | |
| TNO · Cubewano Extended | |
| Adjectives | Salacian |
| Symbol | or (rare) |
| Orbital characteristics | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 37.16 yr (13,572 days) |
| Earliest precovery date | 25 July 1982 |
| Aphelion | 46.670 AU |
| Perihelion | 37.697 AU |
| 42.184 AU | |
| Eccentricity | 0.10636 |
| 273.98 yr (100,073 days) | |
| 123.138° | |
| 0° 0m 12.951s / day | |
| Inclination | 23.921° |
| 279.880° | |
| 312.294° | |
| Known satellites | 1 (Actaea) |
| Physical characteristics | |
| 846±21 km 866±37 km | |
| Mass | (4.922±0.071)×1020 kg (system) |
Mean density | 1.5±0.12 g/cm3 1.26±0.16 g/cm3 |
| 6.09 h (0.254 d) | |
| 6.09 h | |
| 0.042±0.004 | |
| BB B−V=0.66±0.06 V−R=0.40±0.04 V−I=0.83±0.04 | |
| 20.7 | |
| 4.360±0.011 (system) 4.476±0.013 (Salacia) 6.850±0.053 (Actaea) 3.9 | |
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Salacia (minor-planet designation: 120347 Salacia) is a large trans-Neptunian object (TNO) and possible dwarf planet in the Kuiper belt, approximately 850 km (530 mi) in diameter. It was discovered on 22 September 2004, by American astronomers Henry Roe, Michael Brown and Kristina Barkume at the Palomar Observatory in California, United States. Salacia orbits the Sun at an average distance that is slightly greater than that of Pluto. It was named after the Roman goddess Salacia and has a single known moon, Actaea.