ASTROMETRIC INVESTIGATION OF A BAKER-NUNN CAMERA
Abstract
The images of 1547 stars from the ''Bonner Durchmusterung'' which appear on a film taken with a Baker-Nunn camera were measured on a Mann two-screw measuring machine in 22 sittings, extending over a period of more than 100 days, during which time the film was left in the measuring machine. An attempt was made to check the creeping of the film with respect to the measuring machine, by frequently measuring four crosses which were scratched into the emulsion near the edges. Whatever creeping of the film occurs can fairly satisfactorily be represented by an affine transformation. More than four fiducial marks would have to be measured in order to check the film creeping during the measurements more accurately. By selecting the 823 AGK2 stars in the frame, and using them as reference stars, the systematic errors of the positions which depend on magnitude and color were established. The accuracy of a star position obtained from a Baker-Nunn film was obtained. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 25, 1962
- Accession Number
- AD0282623
Entities
People
- Heinrich Eichhorn