2010 EK139
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2010 EK139
Las Campanas Observatory discovery images of 2010 EK139
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Discovery[1]
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| Discovered by | A. Udalski S. S. Sheppard M. Kubiak C. Trujillo Las Campanas Observatory (304) |
| Discovery date | 2010-03-13 |
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Designations
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| MPC designation | 2010 EK139 |
| Minor planet category |
TNO (SDO)[2] 7:2[3] |
| Epoch July 23, 2010 | |
| Aphelion | 106.25 AU (Q) |
| Perihelion | 32.45 AU (q) |
| Semi-major axis | 69.35 AU (a) |
| Eccentricity | 0.53203 |
| Orbital period | 577.58 yr |
| Mean anomaly | 342.28° (M) |
| Inclination | 29.50° |
| Longitude of ascending node | 346.26° |
| Argument of perihelion | 284.84° |
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Physical characteristics
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| Dimensions | 470+35 −10 km[5] |
| Albedo | 0.25+0.02 −0.05[5] |
| Apparent magnitude | 19.9[6] 19.6R[3] |
| Absolute magnitude (H) | 3.8 ± 0.1[5] |
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,[4] it is very likely a dwarf planet.[9]
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Distance
It will come to perihelion around 2038,[4] and is currently 39.1 AU from the Sun.[6]
It has been observed 122 times over 5 oppositions and has an orbit quality of 2.[4] There are precovery images dating back to 2002.[3] A ten million year integration of the orbit shows that this object may be in a 7:2 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—about 470 km.[5]
Observation by Mike Brown using the Keck telescope in March 2012 suggest that there is no satellite, which makes determination of its mass impossible.[5]
See also
- 2010 KZ39
- 2010 EL139
- 2010 FX86
- 2010 HE79
- (225088) 2007 OR10
References
- ^ "MPEC 2010-G49 : 2010 EK139". IAU Minor Planet Center. 2010-04-08. http://www.minorplanetcenter.org/mpec/K10/K10G49.html. Retrieved 2010-12-03.
- ^ "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. http://www.minorplanetcenter.org/iau/lists/Centaurs.html. Retrieved 2010-12-02.
- ^ a b c d Marc W. Buie (2010-04-09 using 32 of 32 observations). "Orbit Fit and Astrometric record for 10EK139". SwRI (Space Science Department). http://www.boulder.swri.edu/~buie/kbo/astrom/10EK139.html. Retrieved 2010-12-02.
- ^ a b c d "JPL Small-Body Database Browser: (2010 EK139)". 2011-04-11 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2010EK139. Retrieved 2010-12-02.
- ^ a b c d e Pál, A.; Kiss, C.; Müller, T. G.; Santos-Sanz, P.; Vilenius, E.; Szalai, N.; Mommert, M.; Lellouch, E. et al. (2012). ""TNOs are Cool": A survey of the trans-Neptunian region. VII. Size and surface characteristics of (90377) Sedna and 2010 EK139". Astronomy & Astrophysics 541: L6. DOI:10.1051/0004-6361/201218874. arXiv:1204.0899. http://adsabs.harvard.edu/abs/2012A%26A...541L...6P.
- ^ a b "AstDys 2010EK139 Ephemerides". Department of Mathematics, University of Pisa, Italy. http://hamilton.dm.unipi.it/astdys/index.php?pc=1.1.3.0&n=2010EK139. Retrieved 2010-12-11.
- ^ MPC (8 April 2010). "MPEC 2010 G50 : 2010 EK139". MPC. Archived from the original on 14 May 2010. http://www.minorplanetcenter.org/mpec/K10/K10G50.html. Retrieved 4 May 2010.
- ^ Krzysztof Urbański (4 May 2010). "Układ Słoneczny coraz większy". Rzeczpospolita. http://www.rp.pl/artykul/470516_Uklad_Sloneczny_coraz_wiekszy.html. Retrieved 4 May 2010. (English translation)
- ^ 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 2012-05-08.
External links
- 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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