SECRETARY'S REPORT 85 



Special Report No. 70, July 18, 1961. 



The motion of Satellite 1958 Epsilon around its center of mass, by G. 

 Colombo. 

 Special Report No. 71, July 24, 1961. 



Elements of the orbit of the Satellite 1959 Eta (Vanguard III) during the 

 first year after launching, by P. E. Zadunaisky and B. Miller. 

 Special Report No. 72, August 9, 1961. 



Tesseral harmonics of the potential of the earth as derived from satellite 

 motions, by Y. Kozai. 

 Special Report No. 73, August 10, 1961. 



Differential orbit improvement with the use of rotated residuals, by I. G. 

 Izsak. 

 Special Report No. 74, September 18, 1961. 



On the accuracy of measurements made upon films photographed by Baker- 

 Nunn satellite tracking cameras, by K. Lassovszky. 

 Special Report No. 75, September 19, 1961. 



Density of the heterosphere related to temperature, by M. Nicolet. 

 Special Report (unnumbered), September 20, 1961. 



Index to SAO Special Reports Nos. 1-75. 

 Special Report No. 76, October 2, 1961. 



Effects of the earth's ionosphere on HF radio astronomy from artificial satel- 

 lites, by M. D. Grossi, K. M. Strom, and S. E. Strom. 

 Special Report No. 77, October 24, 1961. 



Short-periodic oscillations in the drag of Satellite 1958 Alpha, by L. G. 

 Jacchia and J. Slowey. 

 Special Report No. 78, October 25, 1961. 



Satellite orbital data : Satellites 1958 Alpha, 1958 ^31 and 1959 il by B. Miller, 

 for May-Dec. 19*J0, compiled by D. V. Mechau. 

 Special Report No. 79, October 30, 1961. 



The analysis of gravity, by H. Jeffreys. 

 Special Report No. 80, November 1, 1961. 



The stabilization of an artificial satellite at the inferior conjunction point 

 of the earth-moon system, by G. Colombo. 

 Special Report No. 81, November 24, 1961. 



The orbits of the Satellites 1959 al and 1959 a2 and the perturbations on 

 the perigee distance of 1959 al, by R. C. Nigam. 

 Special Report No. 82 (P-1) , November 30, 1961. 



Catalog of precisely reduced observations: Satellites 1959 al, for Feb. 17- 

 June 30, 1959 ; and 1959 Eta, for Sept. 18-Dec. 31, 1959, prepared by G. 

 Veis. 

 Special Report No. 83, January 31, 1962. 



Project Celescope, by R. J. Davis and Celescope staff. 

 Special Report No. 84, February 9, 1962. 



Preliminary analysis of the atmospheric drag of the twelve-foot balloon 

 satellite (1961 SI), by L. G. Jacchia and J. Slowey. 

 Special Report No. 85 (P-2), February 12, 1962. 



Catalog of precisely reduced observations: Satellites 1959 al, for July 

 1-Dec. 31, 1959 ; 1959 a2, for Mar. 6-May 31, 1959 ; 1960 i2, for Sept. 10-Dec. 

 31, 1960 ; 1960 Omicrou, for Nov. i;^Nov. 16, 1960 ; and 1960 Sigma, for Dec. 

 8-Dec. 10, 1960, prepared by G. Veis. 

 Special Report No. 86, February 21, 1962. 



Satellite orbital data : Satellites 1958 Alpha, for Jan. 1-July 1, 19C1 ; 1958 

 /91, for Jan. l^uly 27, 1961 ; 1960 il, for Nov. 4, 1960- July 3, 1961 ; 1961 51, 

 for Feb. 16-July 2, 1961 ; and 1961 vl, for April 28-Sept. 1, 1961, bj B. 



