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 | 46.5395 AU |
| Perihelion | 37.8383 AU |
| Semi-major axis | 42.1889 AU |
| Eccentricity | 0.10312 |
| Orbital period | 274.03 yr (100091 d) |
| Mean anomaly | 113.75° |
| Inclination | 23.9396° |
| Longitude of ascending node | 280.1885° |
| Argument of perihelion | 311.078° |
| Satellites | 1 |
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Physical characteristics
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| Dimensions | 905±103 km[4] |
| Mass | 4.50×1020 kg |
| Mean density | 1.16+0.59 −0.36 g/cm³[4] |
| Sidereal rotation period |
6.09 h[3] |
| Albedo | 0.035 |
| 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 website lists Salacia as a highly likely dwarf planet.[6] The diameter of the object is currently estimated to be just over 900 km.[4]
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.
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[edit] Name
(120347) 2004 SB60 was assigned the name Salacia /sæˈleɪʃə/ on 18 February 2011. 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] Physical properties
Even though Salacia has an inclination of 24°, it is not a member of the Haumea family since the near infrared spectrum is basically featureless and shows less than 5% water ice.[8] The total mass of the Salacia/Actaea system is 4.66 ± 0.22×1020 kg. From the relative diameters about 96% of this mass should be in Salacia itself. Salacia has the lowest albedo and density of any TNO that big.[4]
[edit] Satellite
Salacia has one natural satellite, Actaea, that orbits its primary every 5.494 days at a distance of 5619±87 km. It has a diameter of 303±35 km.[4] It was discovered on 21 July 2006 by Keith S. Noll, Harold Levison, Denise Stephens and Will Grundy with the Hubble Space Telescope.[9]
[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 2012-05-07.
- ^ a b c d e J.A. Stansberry. "Physical Properties of Trans-Neptunian Binaries (120347) Salacia–Actaea and (42355) Typhon–Echidna". Elsevier. http://www.sciencedirect.com/science/article/pii/S0019103512001224. Retrieved 2012-04-27.
- ^ 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.
- ^ [1]
[edit] External links
- Orbital simulation from JPL (Java) / Horizons Ephemeris
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