2010 EK139

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2010 EK139

Las Campanas Observatory discovery images of 2010 EK139
Discovery[1]
Discovered by A. Udalski
S. S. Sheppard
M. Kubiak
C. Trujillo
Las Campanas Observatory (304)
Discovery date 2010-03-13
Designations
MPC designation 2010 EK139
Minor planet category TNO (SDO)[2]
2:7[3]
Orbital characteristics[4]
Epoch JD 2456400.5 (18 April 2013)
Aphelion 105.57 AU (Q)
Perihelion 32.515 AU (q)
Semi-major axis 69.04 AU (a)
Eccentricity 0.5291
Orbital period 573.7 yr
Mean anomaly 343.90° (M)
Inclination 29.4529°
Longitude of ascending node 346.1636°
Argument of perihelion 284.74°
Physical characteristics
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]

    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 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—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

    References

    1. ↑ "MPEC 2010-G49 : 2010 EK139". IAU Minor Planet Center. 2010-04-08. Retrieved 2010-12-03. 
    2. ↑ "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2010-12-02. 
    3. ↑ 3.0 3.1 3.2 3.3 Marc W. Buie (2010-04-09 using 32 of 32 observations). "Orbit Fit and Astrometric record for 10EK139". SwRI (Space Science Department). Retrieved 2010-12-02. 
    4. ↑ 4.0 4.1 4.2 4.3 "JPL Small-Body Database Browser: (2010 EK139)". 2011-04-11 last obs. Retrieved 2013-09-04. 
    5. ↑ 5.0 5.1 5.2 5.3 5.4 Pál, A.; Kiss, C.; Müller, T. G.; Santos-Sanz, P.; Vilenius, E.; Szalai, N.; Mommert, M.; Lellouch, E.; Rengel, M.; Hartogh, P.; Protopapa, S.; Stansberry, J.; Ortiz, J. -L.; Duffard, R.; Thirouin, A.; Henry, F.; Delsanti, A. (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. arXiv:1204.0899. Bibcode:2012A&A...541L...6P. doi:10.1051/0004-6361/201218874. 
    6. ↑ 6.0 6.1 "AstDys 2010EK139 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2010-12-11. 
    7. ↑ MPC (8 April 2010). "MPEC 2010 G50 : 2010 EK139". MPC. Archived from the original on 14 May 2010. Retrieved 4 May 2010. 
    8. ↑ Krzysztof Urbański (4 May 2010). "Układ Słoneczny coraz większy". Rzeczpospolita. Retrieved 4 May 2010.  (English translation)
    9. ↑ Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 2012-05-08. 

    External links

    Asteroid belt
    Kuiper belt
    Scattered disc
    Other
    Likely: Sedna
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