(471143) 2010 EK139

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(471143) 2010 EK139
Discovery images taken with the 1.3-meter Warsaw Telescope at Las Campañas, Chile
Discovery [1][2]
Discovered by A. Udalski
S. S. Sheppard
M. Kubiak
C. Trujillo
Discovery site Las Campañas Obs.
Discovery date 13 March 2010
MPC designation (471143) 2010 EK139
TNO[3] · SDO · 2:7[4]
Orbital characteristics[3]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 3
Observation arc 13.16 yr (4,808 days)
Aphelion 108.34 AU
Perihelion 32.561 AU
70.452 AU
Eccentricity 0.5378
591.36 yr (215,992 days)
0° 0m 6.12s / day
Inclination 29.436°
Known satellites None[5]
Physical characteristics
Dimensions 470+35
697 km[6]
0.10 (assumed)[6]
19.6 (R)[4]
3.8[3] · 3.8±0.1[5] · 3.89±0.04 (S)[7]

(471143) 2010 EK139 is a trans-Neptunian object in the scattered disc, orbiting the Sun in the outermost region of the Solar System.

It was discovered on 13 March 2010, by astronomers Andrzej Udalski, Scott Sheppard, Marcin Kubiak and Chad Trujillo at the Las Campañas Observatory in Chile.[1] The discovery was made during the Polish OGLE project of Warsaw University.[9] Based on its absolute magnitude and assumed albedo, it is very likely a dwarf planet[10] with a calculated diameter of approximately 470 kilometers.[5]


The minor planet orbits the Sun at a distance of 32.6–108.3 AU once every 591 years and 4 months (215,992 days). Its orbit has an eccentricity of 0.54 and an inclination of 29° with respect to the ecliptic.[3]

It is currently 39.1 AU from the Sun and reach perihelion in 2038.[3][8] A ten-million-year integration of the orbit shows that this object is in a 2:7 resonance with Neptune.[4]

A first precovery was taken by the Near-Earth Asteroid Tracking at Palomar Observatory in 2002, extending the minor planet's observation arc by 8 years prior to its discovery observation. Since then it has been observed 143 times over 6 oppositions and has an orbit quality of 1.[1]

Physical properties[edit]

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).[5]

Published in May 2013, a rotational light-curve for this minor planet was obtained from photometric observations at the discovering observatory with the 2.5-meter Irénée du Pont Telescope. It gave a rotation period of 7.07±0.05 hours with a brightness variation of 0.12 magnitude (U=2).[7]

Observations by American astronomer Michael Brown, using the Keck telescope in March 2012, suggest that there is no satellite, which makes determination of its mass impossible.[5]

See also[edit]


  1. ^ a b c "471143 (2010 EK139)". Minor Planet Center. Retrieved 21 September 2016. 
  2. ^ "MPEC 2010-G49 : 2010 EK139". IAU Minor Planet Center. 2010-04-08. Retrieved 2010-12-03. 
  3. ^ a b c d e "JPL Small-Body Database Browser: 471143 (2010 EK139)" (2015-05-14 last obs.). Jet Propulsion Laboratory. Retrieved 2 June 2017. 
  4. ^ a b c Marc W. Buie. "Orbit Fit and Astrometric record for 10EK139" (2010-04-09 using 32 of 32 observations). SwRI (Space Science Department). Archived from the original on 2011-06-22. Retrieved 2010-12-02. 
  5. ^ a b c d e f g Pál, A.; Kiss, C.; Müller, T. G.; Santos-Sanz, P.; Vilenius, E.; Szalai, N.; et al. (May 2012). ""TNOs are Cool": A survey of the trans-Neptunian region. VII. Size and surface characteristics of (90377) Sedna and 2010 EK139" (PDF). Astronomy and Astrophysics. 541: 4. arXiv:1204.0899Freely accessible. Bibcode:2012A&A...541L...6P. doi:10.1051/0004-6361/201218874. Retrieved 21 September 2016. 
  6. ^ a b "LCDB Data for (471143)". Asteroid Lightcurve Database (LCDB). Retrieved 21 September 2016. 
  7. ^ a b c Benecchi, Susan D.; Sheppard, Scott S. (May 2013). "Light Curves of 32 Large Transneptunian Objects". The Astronomical Journal. 145 (5): 19. arXiv:1301.5791Freely accessible. Bibcode:2013AJ....145..124B. doi:10.1088/0004-6256/145/5/124. Retrieved 21 September 2016. 
  8. ^ a b "AstDys 2010EK139 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2010-12-11. 
  9. ^ Krzysztof Urbański (4 May 2010). "Układ Słoneczny coraz większy". Rzeczpospolita. Retrieved 4 May 2010.  (English translation)
  10. ^ Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 20 September 2016. 

External links[edit]