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Planetary and Space Science
Volume 18, Issue 11 , November 1970, Pages 1585-1595

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doi:10.1016/0032-0633(70)90033-4    How to cite or link using doi (opens new window) Cite or link using doi  
Copyright © 1970 Published by Elsevier Science Ltd. All rights reserved.

The orbit of 1968-59A, and its use in upper-atmosphere research

D. G. King-Hele

Royal Aircraft Establishment, Farnborough, Hants., England

Received 7 May 1970.  Available online 10 October 2002.


Abstract

Accurate orbits of the high-drag satellitenext term 1968-59A, which had an initial perigee height of 160 km, have been obtained at 9 epochs during its 117-day life with the aid of the R.A.E. orbit determination program PROP. All available optical and radar observations were used. On most of the orbits the perigee height has a standard deviation less than 0.4 km; for the longitude of the node and the inclination i, the average s.d. is 0·003°. The value of i decreased from 89·88° initially to 89·75° just before decay, mainly due to the effect of atmospheric rotation, and by fitting a theoretical curve the following values were obtained for the atmospheric rotational previous termspeed,next term expressed as capital Lambda, Greek times the Earth's rotational previous termspeed:next term capital Lambda, Greek = 1·20 ± 0·07 at 170 km height; capital Lambda, Greek = 1·1 ± 0·1 at 150 km.



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Planetary and Space Science
Volume 18, Issue 11 , November 1970, Pages 1585-1595


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