120347 Salacia
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Discovery
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| Discovered by | Henry G. Roe, Michael E. Brown, Kristina M. Barkume |
| Discovery date | September 22, 2004 |
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Designations
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| MPC designation | (120347) 2004 SB60 |
| Pronunciation | /sæˈleɪʃⁱə/ |
| Minor planet category |
Cubewano (MPC)[1] Extended (DES)[2] |
| Aphelion | 46.5474 AU |
| Perihelion | 37.3920 AU |
| Semi-major axis | 41.9697 AU |
| Eccentricity | 0.109071 |
| Orbital period | 90312.3 d, 271.90y |
| Mean anomaly | 107.849° |
| Inclination | 23.920° |
| Longitude of ascending node | 280.008° |
| Argument of perihelion | 309.461° |
| Satellites | 1 |
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Physical characteristics
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| Dimensions | 548 km (assumed)[4] |
| Mass | 2.04×1020 kg |
| Mean density | 2.0? (assumed) |
| Sidereal rotation period |
6.09 h[3] |
| Albedo | 0.09 (assumed) |
| Absolute magnitude (H) | 4.2[3] |
120347 Salacia,[5] original provisional designation: (120347) 2004 SB60, is a trans-Neptunian object that resides in the Kuiper belt. It was discovered on September 22, 2004 by Henry G. Roe, Michael E. Brown, and Kristina M. Barkume at the Palomar Observatory. Mike Brown's automatically updated website lists Salacia as a highly likely dwarf planet,[6] but the diameter of the object has never been measured.
It has been observed 100 times with precovery images back to 1982.[3]
Salacia orbits the Sun at an average distance slightly greater than that of Pluto.
Contents |
[edit] Name
(120347) 2004 SB60 was assigned the name Salacia /sæˈleɪʃə/ on 2011 Feb 18. Salacia is the goddess of salt water and the wife of Neptune.[7]
The moon's name Actaea /ækˈtiːə/ was assigned on the same date. Actaea is a nereid, or sea nymph.
[edit] Infrared spectrum
Even though Salacia has an inclination of 24°, it is not a Haumea-family member since the near infrared spectrum is basically featureless and shows less than 5% water-ice.[8]
[edit] Satellite
Salacia has one natural satellite Actaea that orbits its primary every 5 days at a distance of 3500 km. It has a tentative size of ~190 km.[9] It was discovered on 21 July 2006 by Keith S. Noll, Harold Levison, Denise Stephens and Will Grundy with the Hubble Space Telescope.[10]
[edit] References
- ^ "MPEC 2009-R09 :Distant Minor Planets (2009 SEPT. 16.0 TT)". IAU Minor Planet Center. 2009-09-04. http://www.minorplanetcenter.net/mpec/K09/K09R09.html. Retrieved 2011-07-05.
- ^ Marc W. Buie (2007-08-12 using 62 of 73 observations). "Orbit Fit and Astrometric record for 120347". SwRI (Space Science Department). http://www.boulder.swri.edu/~buie/kbo/astrom/120347.html. Retrieved 2009-10-04.
- ^ a b c d "JPL Small-Body Database Browser: 120347 (2004 SB60)". 2010-11-05 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=120347. Retrieved 2009-08-28.
- ^ Wm. Robert Johnston. "List of Known Trans-Neptunian Objects". Johnston's Archive. Archived from the original on 2009-09-03. http://www.johnstonsarchive.net/astro/tnoslist.html. Retrieved 2009-08-28.
- ^ MPC 73984
- ^ Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. http://www.gps.caltech.edu/~mbrown/dps.html. Retrieved 2011-08-25.
- ^ johnstonsarchive.net
- ^ E.L. Schaller and M.E. Brown (2008). "Detection of Additional Members of the 2003 EL61 Collisional Family via Near-Infrared Spectroscopy". Astrophysical Journal. arXiv:0808.0185. Bibcode 2008ApJ...684L.107S. doi:10.1086/592232.
- ^ (120347) 2004 SB60
- ^ [1]
[edit] External links
- Orbital simulation from JPL (Java) / Horizons Ephemeris
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