The oblateness of Uranus at the 1-microbar level

Details The oblateness of Uranus at the 1-microbar level The oblateness of Uranus at the 1-microbar level

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...78..119b&link_type=abstract

Icarus (ISSN 0019-1035), vol. 78, March 1989, p. 119-130.

Astronomy and Astrophysics

Astronomy

13

Oblate Spheroids, Planetary Atmospheres, Stellar Occultation, Uranus (Planet), Light Curve, Planetary Limb, Planetary Rotation, Temperature Distribution, Voyager 2 Spacecraft, Uranus, Oblateness, Pressure, Radius, Rotation, Period, Calculations, Occultations, Geometry, Astronomy, Earth-Based Observations, Analysis, Photons, Atmosphere, Astrometry

Scientific paper

Atmospheric occultation half-light times and scale heights, together with updated ring-orbit model parameters, are presently used to ascertain the planetary limb shape and thereby derive the radius and oblateness of Uranus at the 1-microbar level from stellar occultation observations obtained on March 10, 1977, and March 23, 1983. Assuming that the planet is in hydrostatic equilibrium, the inferred rotation period is 17.7 + or - 0.6 hr in the -30 to +26 deg latitude range of these observations. These results are noted to be consistent with those based by Lindal et al. (1987) on Voyager 2 observations, where the period at 5 deg latitude is of the order of 18.0 + or - 0.3 hr.

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