Mathematics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992lpico.789q..27d&link_type=abstract
In Lunar and Planetary Inst., Papers Presented to the International Colloquium on Venus p 27 (SEE N93-14288 04-91)
Mathematics
1
Ephemerides, Error Analysis, Estimates, Least Squares Method, Planetary Rotation, Radar Measurement, Vectors (Mathematics), Venus (Planet), Geodesy, Magellan Project (Nasa)
Scientific paper
A control network of the north polar region of Venus has been established by selecting and measuring control points on full-resolution radar strips. The measurements were incorporated into a least-squares adjustment program that improved initial estimates of the coordinates of the control points, pole direction, and rotation rate of Venus. The current dataset contains 4206 measurements of 606 points on 619 radar strips. The accuracy of the determination is driven by spacecraft ephemeris errors. An accurate estimate of the rotation period of Venus was obtained by applying an ephemeris improvement technique. The second cycle closure orbits improved ephemeris solutions for 40 orbits (376-384, 520-528, 588-592, 658-668, 1002-1010, 1408-1412, 1746-1764, and 2166-2170) are included and fixed in the geodetic control computations, thus trying the network to the J2000 coordinate system.
Chodas Paul W.
Colvin Tim R.
Davies Mike E.
Rogers Patricia G.
Sjogren William L.
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