1 Observing program

The observing program comprises the following double stars:
- long period binaries with non-definitive orbital elements, but considerable annual motion,
- wide pairs, which have not been measured for many years
- close pairs not observed by Hipparcos.
In the lists one will find many pairs with first class orbits as well as pairs having been measured by Hipparcos or recently by Speckle. It was, however, the author's intention to get as many calibration measurements as possible during the first two years of micrometer measurements with the Cassegrain.