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A Statistical Evaluation of the Limitations of Single-channel Intermediate-band Photoelectric Stellar PhotometryError distribution in differential photometry for a moving solar system object is investigated. The results of differential photometry of several dozen pairs of planetary comparison stars observed since 1972 are reviewed. Each pair of stars was observed along with the corresponding planet or satellite, typically about ten times during the course of a single apparation lasting about four months. The comparison stars are chosen to bracket the opposition position of the planet, the expected opposition magnitude, and solar color. In practice, this means that the range of spectral type was mid-F to early K, the range of B-Y color was about 0.25 to 0.95 mag, the range of differential magnitude was less than 2 mag but most often less than 1.0 mag, and the difference in declination was typically less than 3 deg. The difference in air mass at meridian transit was usually less than 0.03, and rarely exceeded 0.01. Hence, differential extinction effects are negligible, except under extraordinary conditions.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Lockweed, G. W.
(Lowell Observatory Flagstaff, AZ, United States)
Date Acquired
August 12, 2013
Publication Date
November 1, 1984
Publication Information
Publication: NASA. Ames Research Center Proc. of the Workshop on Improvements to Photometry
Subject Category
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
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