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The control net of Mars - May 1977The development of planet-wide control nets of Mars is reviewed, and the May 1977 update is described. This updated control net was computed by means of a large single-block analytical triangulation incorporating the new direction of the spin axis and the new rotation rate of Mars, as determined from radio tracking data provided by the Viking lander spacecraft. The analytical triangulation adjusts for planimetric control only (areocentric latitude and longitude) and for the camera orientation angles. Most of the areocentric radii at the control points were interpolated from radio occultation measurements, but a few were determined photogrammetically, and a substantial number were derived from elevation contours on the 1976 USGS topographic series of Mars maps. A value of V, measured from Mars' vernal equinox along the equator to the prime meridian (Airy-0) is presented.
Document ID
19780052710
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Davies, M. E.
(Rand Corp. Santa Monica, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
May 10, 1978
Publication Information
Publication: Journal of Geophysical Research
Volume: 83
Subject Category
Lunar And Planetary Exploration
Accession Number
78A36619
Funding Number(s)
CONTRACT_GRANT: NASW-3017
Distribution Limits
Public
Copyright
Other

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