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HD 192950


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Archival light curves from the Bamberg Sky Patrol: CF Octantis, 1964-76
We use the archive of the Bamberg Sky Patrol to obtain light curves ofthe active K subgiant CF Octantis (HD 196818) for the interval 1964-76.Digitized images of the field near CF Oct were obtained with a flat-bedscanner. Aperture photometry was performed of photo-positives of theseimages. Using a transformation to second order in plate magnitude, andfirst order in B-V, for nine field stars for each plate, the Bmagnitudes of CF Oct were obtained for just over 350 plates. Theestimated precision of an individual determination of the B magnitude ofCF Oct is 0.05 mag. Analysis of the resulting data reveals the known 20d rotational variation of this star, and shows the evolution of thelight curves from year to year. We obtain light curves with good phasecoverage for 1964 to 1969 inclusive, partial light curves for 1970 and1976, and a few data points from 1971. The amplitude of variation rangesfrom ~0.2 to ~0.4 mag. There is evidence that the characteristicrotation period of the star in the 1960s was slightly less than thatmeasured from photoelectric photometry in the 1980s.

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Observation and Astrometry data

Constellation:Octant
Right ascension:20h28m59.53s
Declination:-80°43'02.5"
Apparent magnitude:8.957
Distance:143.266 parsecs
Proper motion RA:30.5
Proper motion Dec:-25.7
B-T magnitude:9.493
V-T magnitude:9.002

Catalogs and designations:
Proper Names
HD 1989HD 192950
TYCHO-2 2000TYC 9472-602-1
USNO-A2.0USNO-A2 0075-06616124
HIPHIP 101037

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