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Title:
Rotational properties of Uranus and Neptune
Authors:
Belton, M. J. S.; Terrile, R. J.
Affiliation:
AA(Kitt Peak National Observatory, Tucson, Ariz.)
Publication:
In its Uranus and Neptune p 327-347 (SEE N85-11927 02-91)
Publication Date:
10/1984
Category:
Lunar and Planetary Exploration
Origin:
STI
NASA/STI Keywords:
Neptune (Planet), Planetary Gravitation, Planetary Rotation, Uranus (Planet), Periodic Variations, Planetary Atmospheres, Planetary Cores, Polarity, Spin, Wind Velocity
Bibliographic Code:
1984NASCP2330..327B

Abstract

An assessment of recent research bearing on the rotational properties of Uranus and Neptune is given. It is concluded that these properties are best described by the following estimates; URANUS: Direction of pole = alpha (1950) = 256:72 delta (1950) = -15:04 with an absolute uncertainty of about 0:2, Period = 15 to 17 hours; Sense of spin = Retrograde; NEPTUNE: alpha (1950) = 297:8; delta (1950) = + 41:2, with an uncertainty of about 4 degrees towards the pole of Triton's orbit, Period = 18.2 + or - 0.4 hours, Sense of spin = Prograde. There is a clear signature of large scale, zonal, atmospheric flows in observations of the atmosphere of Neptune. Wind velocities are at least as great as 109 m.sec-1. There is no evidence pro or con for atmospheric motions in the Uranus case.

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