2010 EK139
|
|
| Discovery[1] | |
|---|---|
| Discovered by | A. Udalski S. S. Sheppard M. Kubiak C. Trujillo Las Campanas Observatory (304) |
| Discovery date | 13 March 2010 |
| Designations | |
| MPC designation | 2010 EK139 |
| TNO (SDO)[2] 2:7 [3] |
|
| Orbital characteristics[5] | |
| Epoch 18 April 2013 (JD 2456400.5) | |
| Aphelion | 105.57 AU (Q) |
| Perihelion | 32.515 AU (q) |
| 69.04 AU (a) | |
| Eccentricity | 0.5291 |
| 573.7 yr | |
| 343.90° (M) | |
| Inclination | 29.4529° |
| 346.1636° | |
| 284.74° | |
| Known satellites | None[4] |
| Physical characteristics | |
| Dimensions | 470+35 −10 km [4] |
|
Sidereal rotation period
|
0.295 d (7.07 h)[5] |
| Albedo | 0.25+0.02 −0.05 [4] |
| 19.9 [6] 19.6R [3] |
|
| 3.8 ± 0.1 [4] | |
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2010 EK139[7] is a trans-Neptunian object orbiting the Sun in the scattered disc. It was discovered in 2010 by astronomers from the OGLE team led by Andrzej Udalski from Warsaw University.[8] With an absolute magnitude (H) of 3.8,[5] it is very likely a dwarf planet.[9]
Distance
It will come to perihelion around 2038[5] and is currently 39.1 AU from the Sun.[6]
It has been observed 122 times over five oppositions and has an orbit quality of 2.[5] There are precovery images dating back to 2002.[3] A ten-million-year integration of the orbit shows that this object is in a 2:7 resonance with Neptune.[3]
Physical properties
In 2010, the thermal radiation of 2010 EK139 was observed by the Herschel Space Telescope, which allowed astronomers to estimate its diameter at about 470 kilometres (290 mi).[4]
Observations by Mike Brown, using the Keck telescope in March 2012, suggest that there is no satellite, which makes determination of its mass impossible.[4]
See also
References
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- OCKS: OGLE Carnegie Kuiper belt Survey (OCKS is a Southern sky survey searching for Kuiper-belt objects and dwarf planets)
- Orbital simulation from JPL (Java) / Horizons Ephemeris
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