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HD 188276


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Photometry of the BY Draconis star HR 7578.
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Photometry of 50 suspected variable stars
Fifty stars have been chosen as suspected variable stars and analyzedfor variability. A large portion of this sample are stars that areeither proved active chromosphere stars or are candidates for suchactivity. The photometric data base consists of differential Vmeasurements of the Vanderbilt 16 inch (41 cm) automatic photoelectrictelescope and 25 observers at 26 observatories worldwide. Publishedphotometric data have also been utilized, with proper adjustments madeto ensure that all magnitudes are differential. Searches for photometricperiod, amplitudes, and times of minimum light showed 68 percent of thesample to be photometrically variable with periods found for 34. Twostars were deemed norvariable for the period of observation. Conclusivestatements could not be made concerning the photometric variability ofthe 14 remaining stars.

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Observation and Astrometry data

Constellation:Sagittarius
Right ascension:19h55m10.83s
Declination:-23°54'27.5"
Apparent magnitude:7.963
Distance:381.679 parsecs
Proper motion RA:21.3
Proper motion Dec:-12.9
B-T magnitude:9.547
V-T magnitude:8.094

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 188276
TYCHO-2 2000TYC 6891-1638-1
USNO-A2.0USNO-A2 0600-41838937
HIPHIP 98024

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