120347 Salacia
| Discovery | |
|---|---|
| Discovered by |
H. G. Roe M. E. Brown K. M. Barkume |
| Discovery site | Palomar Obs. |
| Discovery date | 22 September 2004 |
| Designations | |
| MPC designation | (120347) Salacia |
| Pronunciation |
/sæˈleɪʃiə/ (sal-AY-shee-ə) /səˈleɪʃə/ (sə-LAY-shə) |
|
Named after
|
Salacia (Roman mythology) |
| 2004 SB60 | |
|
TNO · Cubewano Extended |
|
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 34.05 yr (12,437 days) |
| Aphelion | 46.476 AU |
| Perihelion | 37.272 AU |
| 41.874 AU | |
| Eccentricity | 0.1099 |
| 270.98 yr (98,974 days) | |
| 122.66° | |
| 0° 0m 12.96s / day | |
| Inclination | 23.930° |
| 280.04° | |
| 308.48° | |
| Known satellites | Actaea (286±24 km) |
| Physical characteristics | |
| Dimensions | 854±45 km (equal albedos) |
| Mass | (4.38±0.16)×1020 kg (system mass) |
|
Mean density
|
1.29+0.29 −0.23 g/cm3 (system) |
| 6.09 h (0.254 d) | |
|
Sidereal rotation period
|
6.09 h |
| 0.044±0.004 | |
| V−I = 0.87±0.01 (Salacia) 0.89±0.02 (Actaea) |
|
|
4.360±0.011 (system) 4.476±0.013 (Salacia) 6.850±0.053 (Actaea) 4.0 |
|
120347 Salacia (sal-AY-shee-ə or sə-LAY-shə), provisional designation 2004 SB60, is a trans-Neptunian object in the Kuiper belt, approximately 850 kilometers in diameter and almost certainly a dwarf planet.
Salacia was discovered on 22 September 2004, by American astronomers Henry Roe, Michael Brown and Kristina Barkume at the Palomar Observatory in California, United States. It has been observed 100 times, with precovery images back to 1982. Salacia orbits the Sun at an average distance that is slightly larger than that of Pluto. It was named after the Roman goddess Salacia and has a single known moon, Actaea.
Salacia is a non-resonant object with a moderate eccentricity (0.107) and large inclination (23.9°), making it a scattered–extended object in the classification of the Deep Ecliptic Survey and a hot classical in the classification system of Gladman et al., which may be a non-distinction if they are part of a single population that formed during the outward migration of Neptune. Salacia's orbit is within the parameter space of the Haumea collisional family, but Salacia is not part of it, because it lacks the strong water-ice absorption bands typical of its members.
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