Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976stin...7717140d&link_type=abstract
Final Report, Jun. 1973 - Aug. 1974 Northwestern Univ., Evanston, IL. Dept. of Astronomy.
Astronomy and Astrophysics
Astronomy
Image Orthicons, Photometry, Stars, Optical Tracking, Satellite Tracking, Space Surveillance (Ground Based)
Scientific paper
The development of the image orthicon into a viable photometric tool is discussed along with the limitations of its effectiveness. It is shown that the image orthicon is capable of stellar photometry with probable errors in magnitude of 0.05. Using a 24-inch f/10 Cassegrain at the Corralitos Observatory in New Mexico, the image orthicon gave repeatable results over an eight magnitude range down to the 18th magnitude with three-second integration times. Reduction curves connecting image diameters with visual magnitudes were derived using standard magnitudes of Sandage and Eggen for stars in NGC 188 for calibration. This photometric technique is particularly adaptable to photometry of an entire field of objects.
Dunlap Justus R.
Hynek Allen J.
Weiler Edward J.
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