471143 Dziewanna

Discovery

Dziewanna was discovered on 13 March 2010 by Andrzej Udalski, Scott S. Sheppard, Marcin Kubiak, and Chad Trujillo using the 1.3-meter Warsaw telescope at Las Campanas Observatory in Chile.^[2] The object was reobserved on 5 April 2010 by the discoverers and on 8 April 2010 by amateur astronomer Jennie McCormick at Farm Cove Observatory in Auckland, New Zealand. The discovery of Dziewanna was announced by the Minor Planet Center on 8 April 2010, although the number of observations was not sufficient to accurately determine the object's orbit.^[2][10] Two hours after the discovery announcement, Andrew Lowe reported precovery observations of Dziewanna in Palomar Observatory's Near-Earth Asteroid Tracking survey images from 2002 and 2003, which revealed that the object followed a highly eccentric orbit around the Sun.^[11][10]

Naming

On 25 September 2018, 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 Optical Gravitational Lensing Experiment of Warsaw University, which was led by Udalski.^[12]

Orbital characteristics

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][8]

Classification

A ten-million-year integration of the orbit shows that this object is in a 2:7 resonance with Neptune.^[4]

Dziewanna also belongs to the scattered disc,^[4] which is a population of TNOs that have distant, inclined, and eccentric orbits that come close to Neptune at perihelion.

The scattered disc population, which includes the dwarf planets Eris and Gonggong, are strongly influenced by Neptune's gravitational perturbations and consequently experience gravitational scattering.^{[13]: 52 }

Size and albedo

Dziewanna's shape is unknown. In 2010, the thermal radiation of Dziewanna was observed by the Herschel Space Telescope, which allowed astronomers to estimate its albedo at 0.25^+0.02
_−0.05, and its diameter at about 470 km (290 mi).^[6] A stellar occultation by Dziewanna was observed on 17 May 2019, yielding a minimum length of 504 km (313 mi) for the longest axis, based on a single chord.^[14]

Rotation and light curves

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).^[7]

Unknown mass

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][15]