3198 Wallonia
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3198 Wallonia, provisional designation Template:Mp, is a stony asteroid and sizable Mars-crosser from the inner regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 30 December 1981, by Belgian astronomer François Dossin at the Haute-Provence Observatory in France.[1] The S/K-type asteroid has a rotation period of 7.5 hours. It was named after the French speaking region of Wallonia in Belgium.[1]
Orbit and classification
Wallonia is a Mars-crossing asteroid, crossing the orbit of Mars at 1.666 AU. Members of this dynamically unstable group are located between the main belt and near-Earth populations. It orbits the Sun at a distance of 1.7–2.7 AU once every 3 years and 3 months (1,177 days; semi-major axis of 2.18 AU). Its orbit has an eccentricity of 0.24 and an inclination of 18° with respect to the ecliptic.[2] The body's observation arc begins with its official discovery observation.[1]
Naming
This minor planet was named after Wallonia, the French speaking part of Belgium, where the discoverer was born and where the Institut d'Astrophysique et Géophysique at the University of Liège is located.[1] The official naming citation was published by the Minor Planet Center on 22 June 1986 (M.P.C. 10848Script error: No such module "Check for unknown parameters".).[3]
Physical characteristics
In the SMASS classification, Wallonia is a common, stony S-type asteroid.[2] In the Bus-DeMeo taxonomy it is a Svw-type, while In both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Wallonia is a K-type asteroid.[4][5]
Rotation period
In April 2008, a rotational lightcurve of Wallonia was obtained from photometric observations by Brian Warner at the Palmer Divide Observatory in Colorado, United States. Lightcurve analysis gave a rotation period of Script error: No such module "val". hours with a brightness amplitude of 0.57 magnitude (U=3Script error: No such module "Check for unknown parameters".).[6]Template:Efn French amateur astronomer René Roy determined a very similar period of Script error: No such module "val". and an amplitude of 0.38 in April 2005 (U=2Script error: No such module "Check for unknown parameters".).[7]
Diameter and albedo
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a stony asteroid of 0.20 and calculates a diameter of 7.13 kilometers based on an absolute magnitude of 13.1.[8] A generic magnitude-to-diameter conversion for an albedo of 0.20 also gives a diameter of 7.1 kilometers.[9]
This makes Wallonia one of the largest mid-sized Mars-crossing asteroids comparable with 1065 Amundsenia (9.75 km), 1139 Atami (9.35 km), 1474 Beira (14.9 km), 1727 Mette (5.44 km), 1131 Porzia (7.13 km), 1235 Schorria (5.55 km), 985 Rosina (8.18 km), 1310 Villigera (15.24 km) and 1468 Zomba (7 km), but far smaller than the largest members of this dynamical group, namely, 132 Aethra, 323 Brucia (former), 1508 Kemi, 2204 Lyyli and 512 Taurinensis, which are all larger than 20 kilometers in diameter.
Notes
References
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External links
- Spectral properties of Mars-crossers and near-Earth objects. Results of the S3OS2 survey
- Asteroid Lightcurve Database (LCDB), query form (info Script error: No such module "webarchive".)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
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