Author/Authors :
Mahapatra، نويسنده , , Pravas R. and Benner، نويسنده , , Lance A.M. and Ostro، نويسنده , , Steven J. and Jurgens، نويسنده , , Raymond F. and Giorgini، نويسنده , , Jon D. and Yeomans، نويسنده , , Donald K. and Chandler، نويسنده , , John F. and Shapiro، نويسنده , , Irwin I. Shapiro، نويسنده ,
Abstract :
Radar observations of 1989 JA during its discovery apparition yielded dual-polarization echo spectra on two dates at Arecibo and three dates at Goldstone. The echoes indicate that this object has an effective diameter within a factor of two of 1 km, a rotation period less than half a day, and a surface that is fairly smooth at centimeter-to-meter scales.
