2114 Wallenquist
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2114 Wallenquist, provisional designation Template:Mp, is a Themistian asteroid from the outer region of the asteroid belt, approximately 28 kilometers in diameter. It was discovered by Swedish astronomer Claes-Ingvar Lagerkvist at the Australian Mount Stromlo Observatory near Canberra, on 19 April 1976.[1]
Orbit and classification
Wallenquist is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.7–3.7 AU once every 5 years and 9 months (2,090 days). Its orbit has an eccentricity of 0.14 and an inclination of 1° with respect to the ecliptic.[2] The first used observation was made at the U.S. Goethe Link Observatory in 1953, extending the asteroid's observation arc by 23 years prior to its discovery.[1]
Physical characteristics
Rotation period
In April 2010, a rotational lightcurve of Wallenquist obtained by American astronomer Robert Stephens at the Goat Mountain Astronomical Research Station (GMARS, G79Script error: No such module "Check for unknown parameters".), California, gave a well-defined rotation period of Script error: No such module "val". hours with a brightness amplitude of 0.22 magnitude (U=3Script error: No such module "Check for unknown parameters".).[3]
Two other observations, by French astronomer René Roy at Blauvac Observatory (627Script error: No such module "Check for unknown parameters".), France, and by astronomers at the U.S. Palomar Transient Factory, gave a period of Script error: No such module "val". and Script error: No such module "val"., with an amplitude of 0.30 and 0.23, respectively (U=2/2Script error: No such module "Check for unknown parameters".).[4][5]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Wallenquist measures between 21.1 and 27.6 kilometers in diameter while its surface has an albedo in the range of 0.08 and 0.15.[6][7][8][9]
The Collaborative Asteroid Lightcurve Link (CALL) derives an even lower albedo of 0.04 and calculates a diameter of 27.5 kilometer. Despite its low albedo, CALL characterizes the body as a S-type rather than a darker C-type asteroid.[10]
Naming
This minor planet was named in honor of Swedish astronomer Åke Wallenquist (1904–1994), former director of the Kvistaberg Station, after which the minor planet 3331 Kvistaberg is named.[11]
After his retirement Wallenquist continued to research dark matter in open clusters at the Uppsala Astronomical Observatory. He co-discovered the near-Earth Amor asteroid 1980 Tezcatlipoca during his stay at the Palomar Observatory in California in 1950.[11] The official Template:MoMP was published by the Minor Planet Center on 1 February 1979 (M.P.C. 4645Script error: No such module "Check for unknown parameters".).[12]
References
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