Vesta: Spin Pole, Size, and Shape from HST Images
作者： Peter C Thomas , Richard P Binzel , Michael J Gaffey , Benjamin H Zellner , Alex D Storrs
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摘要: Abstract HST images obtained over an interval of 71 hr at a scale 52 km/pixel have been used to determine the spin pole, size, and shape Vesta. Several bright dark surface features allow control point stereogrammetric measurement pole orientation. An independent solution can be made from limb terminator coordinates. A combined for Vesta's rotation is α 0 = 308° ± 10°, δ 48° J2000). Its fit by ellipsoid radii 280, 272, 227 (±12) km. The mean density Vesta mass reported Schubart Matson (1979) 3.8 0.6 gm/cm 3 . For this close that Maclaurin spheroid with superposed variations ∼15
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