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Title:
Nonresonance rotation of Venus
Authors:
Shapiro, I. I.; Campbell, D. B.; de Campli, W. M.
Affiliation:
AA(MIT, Cambridge, Mass.), AB(National Astronomy and Ionosphere Center, Arecibo, P.R.), AC(Harvard University, Cambridge, Mass.)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 230, June 1, 1979, p. L123-L126. (ApJL Homepage)
Publication Date:
06/1979
Category:
Lunar and Planetary Exploration; Venus
Origin:
STI
NASA/STI Keywords:
Nonresonance, Planetary Rotation, Radar Astronomy, Venus (Planet), Astrometry, Solar System, Spin Resonance
Keywords:
VENUS, ROTATION, RADAR, OBSERVATIONS, PERIOD, EARTH, SPIN, RESONANCE, ORBIT
DOI:
10.1086/182975
Bibliographic Code:
1979ApJ...230L.123S

Abstract

Radar observations accumulated over the past 14 yr are used to make a precise estimate of the spin vector of Venus. The results obtained show that the spin vector of Venus may be adequately described in the standard 1950.0 coordinate system by a period of 243.01 + or - 0.03 days (retrograde) and a north pole direction corresponding to alpha = 272.8 + or - 0.5 deg and delta = 67.2 + or - 0.3 deg; the quoted errors represent estimates of 70% confidence intervals. The angular separations between the spin vector and those vectors representing the unit normals to the invariable plane of the solar system and the orbital plane of Venus are found to be 0.5 deg and 2.6 deg, respectively. It is concluded that Venus is not rotating with a resonance spin period relative to the orbit of earth and that the spin of Venus may be in a generalized Cassini state.

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