A photo-electric method for the observation of artificial satellites adapted for use with a 24 inch reflecting telescope

A discussion on orbital analysis - Review of tracking methods

“…There are other methods of optical tracking, which have so far not been of much importance statistically but may be in the future. The first of these is the use of photo electric cells to detect the passage of a satellite across a shaped slit in front of the telescope (Fea & Newton 1964). This ought to be a valuable method, but so far has not been mucĥ Lasers are however very promising because they can combine the directional accuracy of optical methods with the range measurement of radar (Lehr, Maestre n erson 1066).…”