471143 Dziewanna

471143 Dziewanna /dʒɛˈvɑːnə/, exact: [d͡ʑɛˈvanna], provisional designation 2010 EK139, is a trans-Neptunian object in the scattered disc, orbiting the Sun in the outermost region of the Solar System.

471143 Dziewanna
Dziewanna imaged by the Hubble Space Telescope in 2012
Discovery [1][2]
Discovered byA. Udalski
S. S. Sheppard
M. Kubiak
C. Trujillo
Discovery siteLas Campanas Obs.
Discovery date13 March 2010
Designations
(471143) Dziewanna
Pronunciation[d͡ʑɛˈvanna]
Named after
Devana (Dziewanna)
(Slavic goddes)[1]
2010 EK139
TNO [3] · SDO · 2:7 [4]
AdjectivesDziewannian
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 3
Observation arc13.16 yr (4,808 d)
Aphelion108.54 AU
Perihelion32.551 AU
70.544 AU
Eccentricity0.5386
592.51 yr (216,416 d)
347.58°
0° 0m 6.12s / day
Inclination29.444°
346.15°
≈ 22 October 2038[5]
±1 days
284.25°
Known satellitesnone[6]
Physical characteristics
Mean diameter
>504 km (occultation)[7]
470+35
−10 km[6]
697 km[8]
7.07±0.05[9]
0.10 (assumed)[8]
0.25+0.02
−0.05[6]
19.6 (R)[4]
19.9[10]
3.8±0.1[6]
3.89±0.04 (S)[9]
3.9[1][3]

    It was discovered on 13 March 2010, by astronomers Andrzej Udalski, Scott Sheppard, Marcin Kubiak and Chad Trujillo at the Las Campanas Observatory in Chile.[1] The discovery was made during the Polish OGLE project of Warsaw University.[11] Based on its absolute magnitude and assumed albedo, it is possibly a dwarf planet[12] with a calculated diameter of approximately 470 kilometers.[6]

    It was named after Devana (Polish form: Dziewanna), a Slavic goddess of the wilderness, forests and the hunt.[1]

    Distance
    Discovery images taken with the 1.3-meter Warsaw Telescope at Las Campañas, Chile
    Precovery images of Dziewanna taken in 2003[13]

    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 will reach perihelion in 2038.[3][10] 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

    In 2010, the thermal radiation of Dziewanna was observed by the Herschel Space Telescope, which allowed astronomers to estimate its diameter at about 470 km (290 mi).[6] A stellar occultation by Dziewanna was observed on 17 May 2019, yielding a single-chord diameter of 504 km (313 mi).[7]

    Published in May 2013, a rotational lightcurve 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).[9]

    Observations by American astronomer Michael Brown, using the Keck telescope in March 2012, suggest that there is no satellite, and therefore no immediate means to determine its mass.[6]

    See also

    References
    1. "471143 Dziewanna (2010 EK139)". Minor Planet Center. Retrieved 5 October 2018.
    2. "MPEC 2010-G49 : 2010 EK139". IAU Minor Planet Center. 2010-04-08. Retrieved 2010-12-03.
    3. "JPL Small-Body Database Browser: 471143 Dziewanna (2010 EK139)" (2015-05-14 last obs.). Jet Propulsion Laboratory. Retrieved 5 October 2018.
    4. 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. JPL Horizons Observer Location: @sun (Perihelion occurs when deldot changes from negative to positive. Uncertainty in time of perihelion is 3-sigma.)
    6. 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". Astronomy and Astrophysics. 541: 4. arXiv:1204.0899. Bibcode:2012A&A...541L...6P. doi:10.1051/0004-6361/201218874. S2CID 119117186.
    7. "TNO Results". ERC Lucky Star Project. Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (LESIA). Retrieved 13 July 2020.
    8. "LCDB Data for (471143)". Asteroid Lightcurve Database (LCDB). Retrieved 21 September 2016.
    9. Benecchi, Susan D.; Sheppard, Scott S. (May 2013). "Light Curves of 32 Large Transneptunian Objects". The Astronomical Journal. 145 (5): 19. arXiv:1301.5791. Bibcode:2013AJ....145..124B. doi:10.1088/0004-6256/145/5/124. S2CID 54183985.
    10. "AstDys 2010EK139 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2010-12-11.
    11. Krzysztof Urbański (4 May 2010). "Układ Słoneczny coraz większy". Rzeczpospolita. Retrieved 4 May 2010. (English translation)
    12. Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Retrieved 20 September 2016.
    13. Lowe, Andrew. "(471143) 2010 EK139 Precovery Images". andrew-lowe.ca.
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