Rotation period of Mars from transits of albedo stations at central meridian, 1659-1971

Details Rotation period of Mars from transits of albedo stations at central meridian, 1659-1971 Rotation period of Mars from transits of albedo stations at central meridian, 1659-1971

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85..945d&link_type=abstract

Astronomical Journal, vol. 85, July 1980, p. 945-960.

Astronomy and Astrophysics

Astronomy

Albedo, Astrometry, Mars (Planet), Planetary Rotation, Telescopes, Ephemeris Time, Radio Tracking, Tables (Data), Viking Lander Spacecraft, Mars, Rotation, Period, Albedo, Astronomy, Telescopic Observations, Drift Rate, Comparisons, Data, Phases, Longitudes, Features, Stations, Coefficients, Position (Location), Data Reduction, Analysis

Scientific paper

The rotation period of Mars P has been re-derived from an analysis of more than 800 telescopic observations from 1659 to 1971 of transits of albedo markings at the central meridian. All observations were corrected for phase effects and reduced to ephemeris time, and corresponding longitudes λ were calculated in the current American Ephemeris (N.A.3) system, which assumes P = 24h37m22s.6689. Solutions of the form λ = λ0 + b(T - T0) were made for a multiplicity of stations, time bases, and weighting systems. There is no significant systematic difference between the drift rates b computed from (a) 109 observations of three stations between 1659 and 1877 (b = -0.010±0.015), (b) 365 observations of 26 stations between 1879 and 1971 (b= -0.014±0.011), or (c) 98 observations of the six best stations by the nine best observers between 1884 and 1971 (b= -0.010±0.004). The adopted mean drift coefficient = -0.010±0.003 (m.e.) implies a correction ΔP = -0.007±0.0002 s to the N.A.3 rotation period and a corrected period P0 = 24h37m22s.662±0.002 (ephemeris time), in excellent agreement with the Viking lander radio determination (22s.663±0.002). If the new prime meridian defined by crater Airy-O is assumed to lie 0°.7 West of the center of Sinus Meridiani (after Davies and Roth), its longitude in the current (N.A.3) ephemeris system was λ= 358°.4±0°.3 (m.e.) at time T0 = 15.5 January 1909 UT.

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