Accession Number : ADA019181

Title :   The Orbit of Ariel 4 (1971 - 109A).

Descriptive Note : Technical rept.,

Corporate Author : ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)

Personal Author(s) : Gooding,R. H.

Report Date : JUL 1975

Pagination or Media Count : 37

Abstract : The definitive orbit of Ariel 4 has been computed, from Minitrack observations, for the two periods during which orbital parameters were required for use in telemetry analysis - from December 1971 (launch) to May 1973, and from October 1973 to December 1973. The orbit was represented by a model with eight independent orbital parameters, and the values of these parameters were determined, and are listed in this Report, at three-day intervals. The accuracy was much the same for all the determinations, being about 4 x 10 to the (-6) power in eccentricity and 2 inches for the angular parameters; this would correspond to a nominal position accuracy of about 120 m in using the orbital parameters, though the actual errors may have approached 500 m at times, arising from perturbations due to unmodelled tesseral harmonics.

Descriptors :   *Orbits, *Scientific satellites, Eccentricity, Computations, Tables(Data), Great Britain

Subject Categories : Spacecraft Trajectories and Reentry

Distribution Statement : APPROVED FOR PUBLIC RELEASE