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78. The lunar occultation of a radio star and the derivation of an upper limit for the density of the lunar atmosphere

Published online by Cambridge University Press:  14 August 2015

B. Elsmore
B. Elsmore*
Affiliation:
Cavendish Laboratory, Cambridge, England

Extract

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Observations were made at Cambridge on 26 April 1955 of the lunar occultation of the large-diameter radio source in the constellation of Gemini. This radio source, having r.a. 06h 13m 37s and dec. 22° 38′ (1950·0), has been identified by Baldwin and Dewhirst (1954) [1] as the galactic nebulosity IC443, which consists of a filamentary structure contained within a circular region of 24′·5 radius. Baldwin and Dewhirst also succeeded in measuring the distribution of radio ‘brightness’ across the source using an interferometric method; their measurements indicate that the diameter of the radio source is approximately the same as that of the visible nebulosity.

Type
Part VI: Meteors and Planets
Information
Symposium - International Astronomical Union , Volume 4: Radio Astronomy , 1957 , pp. 403 - 405
Copyright
Copyright © Cambridge University Press 1957 

References

1. Baldwin, J. E. and Dewhirst, D. W. Nature , 173, 164, 1954.Google Scholar
2. Ryle, M. and Hewish, A. Mem. Roy. Astr. Soc. 67, 97, 1955.Google Scholar
3. Link, F. Bull. Astr. Czech. 7, 1, 1956.Google Scholar