Since the positions had to be known a priori with a precision better than 1 arcsec, a ground-based observation campaign of these asteroids was started in 1983 in order to improve the accuracy of their ephemerides.
Observations were carried out with the meridian circles of Bordeaux and La Palma, and the astrographs of the Marina observatory (San Fernando) and the Fabraobservatory (Barcelona).
The number of selected asteroids was reduced to 48 after consideration of the number of predicted transits during the scheduled nominal mission duration (Bec-Borsenberger 1989).
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