Determination and geophysical interpretation of the orbit of China 2 rocket /197118B/
Abstract
The orbit of the China 2 rocket, 197118B, has been determined at 114 epochs throughout its 5yr 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 leastsquares fittings of theoretical curves to the perturbationfree 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.
 Publication:

Planetary and Space Science
 Pub Date:
 October 1979
 DOI:
 10.1016/00320633(79)901041
 Bibcode:
 1979P&SS...27.1247H
 Keywords:

 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;
 Geophysics