The Lembang's Photographic Observations on Sirius (C)

The photographic observations on the components of Sirius have been made at the Bosscha Observatory after the invention of the Sirius grating by van Albada (1956). This special grating enables us to photograph the two components that differ 10 magnitude Combination of our results with the measurements carried out at the US Naval Observatory (1965-1972) on this pair have covered almost all the observable part of a revolution. An orbit of this system calculated by van den Bos (1960), which mostly based