Venus - Improved spin vector from Goldstone radar observations

Details Venus - Improved spin vector from Goldstone radar observations Venus - Improved spin vector from Goldstone radar observations

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1369s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Oct. 1990, p. 1369-1374.

Astronomy and Astrophysics

Astronomy

8

Planetary Rotation, Polar Regions, Radar Imagery, Spin Dynamics, Venus Surface, Doppler Effect, Error Analysis, Least Squares Method, Parameter Identification, Radar Tracking

Scientific paper

Twenty-one radar images of the surface of Venus obtained between 1972 and 1982 have been compared to follow the motion of 28 distinct features. The delays and Doppler shifts of these features with respect to the subradar points on the various days were used in a nonlinear least-squares parameter estimation algorithm to refine the period and pole orientation of Venus. The period is found to be -243.022 + or - 0.003 days; the right ascension and declination of the pole are: alpha = 272.816 + or - 0.14 deg; beta = 67.218 + or - 0.05 deg (B1950). These standard error estimates attempt to include effects of systematic errors.

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