92 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1960 



Special Report No. 38, Jan. 15, 1960. 



Orbit determination from simultaneous Doppler-shift measurements, by 

 I. G. Izsak. 

 Special Report No. 39, March 30, 1960. 



A variable atmospheric-density model from satellite accelerations, by L. G. 

 Jacchia. 

 Special Report No. 40, May 24, 1960. 



Orbital elements for July and August, 1959, for Satellite 1958 Alpha, by 

 B. Miller ; for Satellite 1958 i31, by C. A. Martin ; for Satellite 1958 52, 

 by Y. Kozai ; for Satellites, 1959 al and a2, by R. C. Nigam ; for Satellite 

 1958 Gamma, by I. G. Izsak. 

 Relative positions of the sun and perigee of an artificial earth satellite, by 

 P. E. Zadunaisky. 

 Special Report No. 41, May 24, 1900. 



The catalogue of precise satellite positions, by K. Lassovszky. 

 Preliminary time reduction for the determination of precise satellite posi- 

 tions, by E. Weston. 

 The star chart project, by P. A. Pardue. 

 Explanation of codes used in the catalogue, by E. P. Bullis. 

 Shutter correction in time for the Baker-Nunn camera, by P. E. Zadunaisky. 

 Special Report No. 42 (C-12), May 24, 1960. 



Catalogue of satellite observations for the period Sept. 1 through Dec. 31, 

 1959, prepared by D. V. Mechau. 

 Special Report No. 43 (0-13), May 25, 1960. 



Catalogue of satellite observations for the period July 1 through Dee. 31, 

 1959, prepared by D. V. Mechau. 

 Special Report No. 44 (C-14), May 25, 1960. 



Catalogue of satellite observations, prepared by D. V. Mechau. 



OTHER ACTIVITIES 



Members of the staff presented papers at meetings of the American 

 Astronomical Society, the American Physical Society, the American 

 Geophysical Union, the National Telemetering Conference, the Ameri- 

 can Meteorological Society, the American Astronautical Society, the 

 American Philosophical Society, the Optical Society of America, the 

 International Association of Geodesy, the Institute of Aeronautical 

 Sciences, and the National Aeronautics and Space Administration. 



The Director and Dr. Jacchia presented papers to the Institute of 

 Aeronautical Sciences in New York. Dr. Krook participated in 

 the International Symposium on Fluid Dynamics of the Ionosphere 

 held at Cornell University. Dr. Hynek led the xVstrophysical Observ- 

 atory's expedition to Spain to observe the occultation of the star 

 Regulus by the planet Venus. George J. Nielson led an airborne 

 expedition to observe the solar eclipse of October, 1960. Dr. Lautman 

 attended a conference of the Geodesy Committee of the Space Science 

 Board of the National Academy of Sciences. He also represented 

 the Smithsonian Institution at the First Interspace Science Sympo- 

 sium held in Nice, January 9-15, 1960. Dr. Whitney presented a 

 paper at the Advanced Research Projects Agency symposium in 



