Determination and geophysical interpretation of the orbit of China 2 rocket /1971-18B/

Details Determination and geophysical interpretation of the orbit of China 2 rocket /1971-18B/ Determination and geophysical interpretation of the orbit of China 2 rocket /1971-18B/

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27.1247h&link_type=abstract

Planetary and Space Science, vol. 27, Oct. 1979, p. 1247-1267.

Physics

Atmospheric Circulation, Geophysical Observatories, Missile Trajectories, Orbit Calculation, Rocket Vehicles, Upper Atmosphere, Harmonic Analysis, Height, Least Squares Method, Perigees, Perturbation Theory, Radar Imagery, Rocket Flight

Scientific paper

The orbit of the China 2 rocket, 1971-18B, has been determined at 114 epochs throughout its 5-yr life, using the RAE orbit refinement program PROP 6, with more than 7000 radar and optical observations from 83 stations. The rocket passed slowly enough through the resonances 14:1, 29:2, 15:1 and 31:2 to allow lumped geopotential harmonic coefficients to be calculated for each resonance by least-squares fittings of theoretical curves to the perturbation-free values of inclination and eccentricity. The rotation rate of the upper atmosphere, at heights near 300 km, was estimated from the decrease in orbital inclination, and values of 1.15, 1.05, 1.10, and 1.05 rev/day were obtained between April 1971 and January 1976. From the variation in perigee height, 25 values of density scale height were calculated, from April 1971 to decay. Comparison with values from the COSPAR International Reference Atmosphere 1972 shows good agreement between April 1971 and October 1975, but the observational values are 10% lower, on average, than CIRA thereafter.

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