Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...25..479p&link_type=abstract
(International Astronomical Union and COSPAR, Colloquium on Planetary Satellites, 28th, Cornell University, Ithaca, N.Y., Aug. 1
Astronomy and Astrophysics
Astronomy
3
Astronomical Photography, Mars (Planet), Natural Satellites, Optical Filters, Orbital Elements, Reference Stars, Satellite Orbits
Scientific paper
Photographic observations of the Martian satellites were made at the opposition of 1967 with the Naval Observatory's 61-inch astrometric reflector. A small partially transparent metallic film filter was used to diminish the light from Mars in order that a measurable image for the planetary disk as well as for the satellites could be obtained. The main result of the orbital adjustment is a +2 deg correction to the zero of mean longitude for Phobos. The scale of the orbits of both satellites gave accordant values for the mass of Mars, and the combined value is in good agreement with modern determinations. The mean error for Deimos derived from the residuals after solution is plus or minus 0.11 sec, which agrees well with the observational error and indicates no large systematic error in either the theory or the observations. For Phobos, however, the residual error, plus or minus 0.19 sec, is twice the expected observational error. The implications of this discrepancy are discussed.
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