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The Tokyo PMC catalog 90-93: Catalog of positions of 6649 stars observed in 1990 through 1993 with Tokyo photoelectric meridian circle
The sixth annual catalog of the Tokyo Photoelectric Meridian Circle(PMC) is presented for 6649 stars which were observed at least two timesin January 1990 through March 1993. The mean positions of the starsobserved are given in the catalog at the corresponding mean epochs ofobservations of individual stars. The coordinates of the catalog arebased on the FK5 system, and referred to the equinox and equator ofJ2000.0. The mean local deviations of the observed positions from theFK5 catalog positions are constructed for the basic FK5 stars to comparewith those of the Tokyo PMC Catalog 89 and preliminary Hipparcos resultsof H30.
| Photometry with the Rapid Alternate Detection System
The photometric procedures, capabilities, and early results of the RapidAlternate Detection System are presented and discussed. The RADS is anautomated, chopping two-star photometry system, designed and constructedat the University of Calgary and currently in operation on the 41-cmtelescope of the Rothney Astrophysical Observatory. The precision of thephotometry is dependent upon Poisson statistics and the frequencybandwidth of the noise. The need for first-order extinction correctionsis eliminated and a procedure for computing second-order extinction andtransformation coefficients is demonstrated. Finally, light curves ofthe W UMa systems 44i Boo and RW Com, obtained on cloudy nights, arepresented.
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