oa MNASSA : Monthly Notes of the Astronomical Society of South Africa - Visual binaries with known periods and small observable arcs

Volume 4, Issue 1
  • ISSN : 0024-8266



The application of our best optical power in modern double star surveys - the 36-inch Lick refractor in the northern-hemisphere, the Bloemfontein 27-inch and Johannesburg 26 1/2-inch in the south - has resulted in the discovery, of a class of binaries which present unusual difficulties to the orbit computer.

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