471143 Dziewanna

471143 Dziewanna
	Dziewanna imaged by the Hubble Space Telescope in 2012
Discovery
Discovered by	A. Udalski; S. S. Sheppard; M. Kubiak; C. Trujillo
Discovery site	Las Campanas Obs.
Discovery date	13 March 2010
Designations
MPC designation	(471143) Dziewanna
Pronunciation	/dʒiːˈwɑːnə/,[citation needed]; Polish: [d͡ʑɛˈvanna]
Named after	Devana (Dziewanna); (Slavic goddess)
Alternative designations	2010 EK139
Minor planet category	TNO · SDO · 2:7
Adjectives	Dziewannian
Orbital characteristics
	Epoch 23 March 2018 (JD 2458200.5)
	Uncertainty parameter 3
Observation arc	13.16 yr (4,808 d)
Aphelion	108.54 AU
Perihelion	32.551 AU
Semi-major axis	70.544 AU
Eccentricity	0.5386
Orbital period (sidereal)	592.51 yr (216,416 d)
Mean anomaly	347.58°
Mean motion	0° 0m 6.12s / day
Inclination	29.444°
Longitude of ascending node	346.15°
Time of perihelion	≈ 22 October 2038; ±1 days
Argument of perihelion	284.25°
Known satellites	none
Physical characteristics
Mean diameter	>504 km (occultation); 470+35; −10 km; 697 km
Synodic rotation period	7.07±0.05
Geometric albedo	0.10 (assumed); 0.25+0.02; −0.05
Apparent magnitude	19.6 (R); 19.9
Absolute magnitude (H)	3.8±0.1; 3.89±0.04 (S); 3.9

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

Dziewanna 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] Based on its absolute magnitude and assumed albedo, it is estimated to have a 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] in honor of the fact that it was discovered during the Polish OGLE project of Warsaw University, which was led by Udalski.^[11]

Distance

Discovery images taken with the 1.3-meter Warsaw Telescope at Las Campañas, Chile

Precovery images of Dziewanna taken in 2003^[12]

Dziewanna orbits the Sun at a distance of 32.6 to 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 precovery image was taken by the Near-Earth Asteroid Tracking at Palomar Observatory in 2002. This extends Dziewanna's observation arc to 8 years prior to discovery. It has since 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]

A rotational lightcurve was obtained from photometric observations at the discovering observatory, with the 2.5-meter Irénée du Pont Telescope, and published in May 2013. The lightcurve shows that the rotation period is 7.07±0.05 hours; the variation in brightness is of magnitude 0.12 (U=2).^[9]

Observations by American astronomer Michael Brown at the Keck telescope in March 2012 failed to find a satellite. There is therefore currently no means to determine Dziewanna's mass.^[6]

References

^ ^a ^b ^c ^d ^e ^f "471143 Dziewanna (2010 EK139)". Minor Planet Center. Retrieved 5 October 2018.
^ "MPEC 2010-G49 : 2010 EK139". IAU Minor Planet Center. 2010-04-08. Retrieved 2010-12-03.
^ ^a ^b ^c ^d ^e "JPL Small-Body Database Browser: 471143 Dziewanna (2010 EK139)" (2015-05-14 last obs.). Jet Propulsion Laboratory. Retrieved 5 October 2018.
^ ^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.
^ JPL Horizons Observer Location: @sun (Perihelion occurs when deldot changes from negative to positive. Uncertainty in time of perihelion is 3-sigma.)
^ ^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". Astronomy and Astrophysics. 541: 4. arXiv:1204.0899. Bibcode:2012A&A...541L...6P. doi:10.1051/0004-6361/201218874. S2CID 119117186.
^ ^a ^b "TNO Results". ERC Lucky Star Project. Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (LESIA). Retrieved 13 July 2020.
^ ^a ^b "LCDB Data for (471143)". Asteroid Lightcurve Database (LCDB). Retrieved 21 September 2016.
^ ^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:1301.5791. Bibcode:2013AJ....145..124B. doi:10.1088/0004-6256/145/5/124. S2CID 54183985.
^ ^a ^b "AstDys 2010EK139 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 2010-12-11.
^ Urbański, Krzysztof (4 May 2010). "Układ Słoneczny coraz większy". Rzeczpospolita. Warsaw: Gremi Media SA. Archived from the original on 11 September 2016. Retrieved 4 May 2010. (Translation pl->en)
^ Lowe, Andrew. "(471143) 2010 EK139 Precovery Images". andrew-lowe.ca.