973 Aralia

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973 Aralia (prov. designation: Template:Mp or Template:Mp) is an asteroid of the Ursula family located in the outer regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 18 March 1922, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southern Germany.[1] The Xk-type asteroid has a rotation period of 7.3 hours. It was named after the genus of ivy-like plant Aralia, also known as "spikenard".[2]

Orbit and classification

Aralia is a core member of the Ursula family (631Script error: No such module "Check for unknown parameters".), a large family of C- and X-type asteroids, named after 375 Ursula.[3][4][5]Template:Rp It orbits the Sun in the outer main-belt at a distance of 2.9–3.6 AU once every 5 years and 9 months (2,103 days; semi-major axis of 3.21 AU). Its orbit has an eccentricity of 0.11 and an inclination of 16° with respect to the ecliptic.[6] The body's observation arc begins at Vienna Observatory on 28 March 1922, or 10 days after its official discovery observation at Heidelberg.[1]

Naming

This minor planet was named after the genus of the Eurasian ivy-like plant Aralia, also known as "spikenard". A member of the Ginseng family, it has evergreen leaves, small yellowish flowers, and black berries. The Template:MoMP in The Names of the Minor Planets by Paul Herget in 1955 (H 93Script error: No such module "Check for unknown parameters".).[2]

Physical characteristics

In the SMASS classification, Aralia is a Xk-type, a transitional subtype of the X-type to the less common K-type asteroids.[6] In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), it is an X-type asteroid.[4][7] The overall spectral type of the Ursula family is that of a C and X-type.[5]Template:Rp

Rotation period

In May 2015, a rotational lightcurve of Aralia was obtained from photometric observations by Julian Oey, Hasen Williams and Roger Groom at the Blue Mountains Observatory Template:Obscode and Darling Range Observatory (DRO). Lightcurve analysis gave a rotation period of Script error: No such module "val". hours with a brightness variation of Script error: No such module "val". magnitude (U=3Script error: No such module "Check for unknown parameters".).[8] Alternative observations by Robert Stephens at the Santana Observatory Template:Obscode in 2001 and Michael S. Alkema at the Elephant Head Observatory Template:Obscode in 2012, gave a similar period determination of Script error: No such module "val". and Script error: No such module "val". hours, with an amplitude of Script error: No such module "val". and Script error: No such module "val"., respectively (U=2/2+Script error: No such module "Check for unknown parameters".).[9]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), and the Japanese Akari satellite, Aralia measures between 51.6 and 55.5 kilometers in diameter and its surface an albedo between 0.08 and 0.10.[10][11][12] Additional publications by WISE in 2012 and 2015, gave a mean diameter Script error: No such module "val". and Script error: No such module "val"., with an albedo of Script error: No such module "val". and Script error: No such module "val"., respectively.[4][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0614 and a diameter of 51.24 kilometers based on an absolute magnitude of 10.1.[9]

References

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  11. ↑ Script error: No such module "Citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)

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External links

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