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Discovery[2]
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|---|---|
| Discovered by | J. A. Larsen[1] |
| Discovery date | June 21, 2003 |
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Designations
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| MPC designation | 2003 MW12 |
| Alternate name(s) | none |
| Minor planet category |
TNO (cubewano)[3] SCATEXTD[4] |
| 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° |
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Physical characteristics
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| Dimensions | 500–1130 km[2][5] 838 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 |
? d |
| Albedo | 0.09? (assumed) |
| Temperature | ~41 K |
| Spectral type | ? |
| 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 very likely a dwarf planet. It was discovered on June 21, 2003 by Jeffrey A. Larsen with the Spacewatch telescope.[8]
It is currently 47.8 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]
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