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| Discovery[2] | |
|---|---|
| Discovered by | J. A. Larsen[1] |
| Discovery date | June 21, 2003 |
| Designations | |
| MPC designation | 2003 MW12 |
| Alternative names | none |
| Minor planet category | TNO (cubewano)[3] SCATEXTD[4] |
| Orbital characteristics[2] | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 7 821.517 Gm (52.284 AU) |
| Perihelion | 5 927.302 Gm (39.622 AU) |
| Semi-major axis | 6 874.410 Gm (45.953 AU) |
| Eccentricity | 0.138 |
| Orbital period | 113 779.342 d (311.51 a) |
| Average orbital speed | 4.37 km/s |
| Mean anomaly | 257.434° |
| Inclination | 21.494° |
| Longitude of ascending node | 184.009° |
| Argument of perihelion | 181.811° |
| Physical characteristics | |
| Dimensions | 500–1130 km[2][5] 818 km (assumed)[6] |
| Mass | 6.1×1020? kg (assumed) |
| Mean density | 2.0? g/cm³ |
| Equatorial surface gravity | 0.2138? m/s² |
| Escape velocity | 0.4044? km/s |
| Sidereal rotation period | 5.9 h[2] |
| Albedo | 0.09? (assumed) |
| Temperature | ≈41 K |
| Apparent magnitude | 20.5[7] |
| Absolute magnitude (H) | 3.4[2] |
(174567) 2003 MW12 is a trans-Neptunian object with an absolute magnitude of 3.4.[2] It is highly likely a dwarf planet. It was discovered on June 21, 2003 by Jeffrey A. Larsen with the Spacewatch telescope.[8]
It is currently 47.5 AU from the Sun,[7] and will come to perihelion around November 2096.[4][9] It has been observed 68 times over 14 oppositions with precovery images back to 1980.[2]
Mike Brown's website lists it as a highly likely dwarf planet, but the diameter of the object has never been measured.[10]
The secondary, 2003 MW12 I, was discovered in an image obtained on 26 April 2009 by the Hubble Space Telescope and was reported in 2011. It is estimated to be possibly 376 km diameter.[11]
References [edit]
- ^ List Of Transneptunian Objects
- ^ a b c d e f g "JPL Small-Body Database Browser: 174567 (2003 MW12)". 2007-06-14 last obs. Retrieved 2008-12-08.
- ^ "MPEC 2009-P26 :Distant Minor Planets (2009 AUG. 17.0 TT)". Minor Planet Center. 2009-08-07. Retrieved 2009-08-24.
- ^ a b Marc W. Buie (2008-04-15). "Orbit Fit and Astrometric record for 174567". SwRI (Space Science Department). Retrieved 2009-08-24.
- ^ "Absolute Magnitude (H)". NASA/JPL. Retrieved 2008-12-07.
- ^ Wm. Robert Johnston. "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 2013-01-10.
- ^ a b "AstDys (174567) 2003MW12 Ephemerides". Department of Mathematics, University of Pisa, Italy. Archived from the original on 2009-04-18. Retrieved 2009-03-22.
- ^ Larsen, Jeffrey A.; Roe, Eric S.; Albert, C. Elise et al. (2007). "The Search for Distant Objects in the Solar System Using Spacewatch". The Astronomical Journal 133 (4): 1247–1270. Bibcode:2007AJ....133.1247L. doi:10.1086/511155.
- ^ "HORIZONS Web-Interface". JPL Solar System Dynamics. Retrieved 2009-08-24.
- ^ Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 2011-08-25.
- ^ (174567) 2003 MW12, compiled by Wm. Robert Johnston, last updated 20 September 2011
External links [edit]
- Orbital simulation from JPL (Java) / Ephemeris
- (174567) 2003 MW12 Precovery Images
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