SECRETARY’S REPORT 87 
the supervision of Dr. Gerhard F. Schilling, 13 reports issued between 
October 15 and June 30 received wide distribution. 
In conjunction with the satellite observations, a program has been 
developed for obtaining observations of the earth’s albedo. For this 
study A. Danjon has developed an ingenious differential photometer. 
On the recommendations of Dr. J. Allen Hynek and Dr. George van 
Biesbroeck, six stations have now been equipped with the instrument 
and preliminary observations have already reached the Astrophysical 
Observatory. 
PUBLICATIONS 
Volume 2 of the Smithsonian Contributions to Astrophysics was 
completed, with the publication of numbers 5-18. Number 10 was of 
particular importance in presenting a complete collection of the optical 
observations of Satellites 1957 Alpha and 1957 Beta, during their 
entire lifetimes. 
During the currrent year the following publications by staff mem- 
bers of the Astrophysical Observatory appeared in various journals: 
ApamMs, R. M.; McCumser, N.; and BRiINKMAN, M. Processed observational data 
for U.S.S.R. Satellites 1957 Alpha and 1957 Beta. Smithsonian Contr. 
Astrophys., vol. 2, pp. 287-337, 1958. 
AsHBROOK, J.; ScHm“Line, G. F.; and Srexnz, T. HE. Glossary of astronomical 
terms for the description of satellite orbits. Smithsonian Contr. Astro- 
phys., vol. 2, pp. 211-217, 1958. 
CAMPBELL, L., Jr., and HyNeEK, J. A. Visual observations of Satellite 1957 Alpha 
One made by Moonwatch stations. Smithsonian Contr. Astrophys., vol. 2, 
pp. 245-274, 1958. 
Davis, R. J. 21-cm observations near galactic longitude 120°. Astrophys. Journ., 
vol. 125, p. 391, 1957. 
Davis, R. J.; WELLES, R. C.; and WuHrepte, F. L. On determining the orienta- 
tion of a cylindrical artificial earth satellite. Astronautica Acta, vol. 38, 
p. 231, 1957. 
FIrEMAN, ©. L. Argon-389 in the Sikhote-Alin meteorite fall. Nature, vol. 181, 
p. 16138, 1958. 
The distribution of helium-3 in the Carbo meteorite. Nature, vol. 181, 
p. 1725, 1958. 
Nuclear processes in geology. In “Nuclear Science Series,” Nat. Res. 
Council, Nat. Acad. Sci., June 1958. 
FIREMAN, BH. L., and ZAHRINGER, J. Depth variation of tritium and argon-37 
produced by high-energy protons iniron. Phys. Rev., vol. 107, p. 1695, 1957. 
Jaccuia, L. G. On the “ecolor-index’’ of meteors. Astron. Journ., vol. 62, p. 358, 
1957. 
On two parameters used in the physical theory of meteors. Smith- 
sonian Contr. Astrophys., vol. 2, pp. 181-187, 1958. 
Basic orbital data for Satellite 1957 61. Smithsonian Contr. Astro- 
phys., vol. 2, p. 285, 1958. 
Successive revisions of orbital elements for Satellite 1957 Beta. 
Smithsonian Contr. Astrophys., vol. 2, p. 339, 1958. 
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