Abstract
view Abstract Citations (29) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Nonresonance rotation of Venus? Shapiro, I. I. ; Campbell, D. B. ; de Campli, W. M. 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. Publication: The Astrophysical Journal Pub Date: June 1979 DOI: 10.1086/182975 Bibcode: 1979ApJ...230L.123S Keywords: Nonresonance; Planetary Rotation; Radar Astronomy; Venus (Planet); Astrometry; Solar System; Spin Resonance; VENUS; ROTATION; RADAR; OBSERVATIONS; PERIOD; EARTH; SPIN; RESONANCE; ORBIT; Lunar and Planetary Exploration; Venus; Rotation:Venus; Venus:Radar Observations full text sources ADS |
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