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3198 Wallonia (1981 YH1) is a Mars-crossing asteroid discovered on December 30, 1981 by François Dossin at Haute-Provence Observatory. With an absolute magnitude (H) of 13, the asteroid is about ~10km in diameter. It is one of the largest Mars-crossing asteroids as few Mars-crossing asteroids have an absolute magnitude brighter than 13.
- Asteroid Lightcurve Analysis at the Palmer Divide Observatory: February-May 2008
- Spectral properties of Mars-crossers and near-Earth objects. Results of the S3OS2 survey