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. 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. 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.

Distance

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

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.

Physical characteristics

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. A stellar occultation by Dziewanna was observed on 17 May 2019, yielding a single-chord diameter of 504 km.

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 hours; the variation in brightness is of magnitude 0.12 ().

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.

References

|access-date = 5 October 2018}}

|access-date = 5 October 2018}}

|access-date=2010-12-03}}

|access-date=2025-10-27}}

|author-link = Marc W. Buie |access-date = 2010-12-02 |archive-url = https://web.archive.org/web/20110622042638/http://www.boulder.swri.edu/~buie/kbo/astrom/10EK139.html |archive-date = 2011-06-22 |url-status = dead}}

|display-authors = 6

|access-date = 2010-12-11}}

|archive-url=https://web.archive.org/web/20160911011103/http://www.rp.pl/artykul/470516-Uklad-Sloneczny-coraz-wiekszy.html |archive-date=11 September 2016 |access-date=4 May 2010 |url-status=dead}} (Translation pl-en)

|access-date = 21 September 2016}}

|access-date = 13 July 2020}}

References

1. [http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&body_group=sb&sstr=2010EK139 JPL Horizons] Observer Location: @sun (Perihelion occurs when deldot changes from negative to positive. Uncertainty in time of perihelion is [[3-sigma]].)
2. Lowe, Andrew. "(471143) 2010 EK139 Precovery Images".