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HD 183555


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CCD photometry and astrometry of visual double stars
We present magnitude and color differences as well as separations andposition angles of the component of 30 visual double and multiplesystems with A-type primaries measured by means of a CCD detectorattached to the 61 cm telescope on Cerro Las Campanas. The angularseparation measured using the V filter rho(V) is systematically largerthan the angular separation measured using the B filter rho(B). At least20 percent of them have very similar astrophysical parameters, but thereal separation of their components is larger than 0.01 parsecs. Thatmeans that these stars are not gravitationally bound, but they have acommon origin.

Double star observations at the Lamont-Hussey Observatory of the University of Michigan at Bloemfontein, South Africa.
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Observation and Astrometry data

Constellation:Ταώς
Right ascension:19h35m28.04s
Declination:-69°05'41.7"
Apparent magnitude:9.395
Proper motion RA:3.7
Proper motion Dec:-23.1
B-T magnitude:9.49
V-T magnitude:9.403

Catalogs and designations:
Proper Names
HD 1989HD 183555
TYCHO-2 2000TYC 9305-1474-1
USNO-A2.0USNO-A2 0150-19109660
HIPHIP 96354
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