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HD 101312


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A homogeneous catalog of new UBV and H-beta photometry of B- and A-type stars in and around the Scorpius-Centaurus OB association
B- and A-type stars in and near the Sco-Cen OB association areinvestigated with UBV and H-beta photometry to acquire data relevant tothe luminosity function of Sco-Cen. The measurements generally consistof two 10-s integrations of U, B, V, (W, N) filters, and theobservations are corrected iteratively for atmospheric extinction andinstrumental response. The data presented give the mean V magnitude,mean B-V, mean U-B, and the estimated uncertainties for these values.The catalog provides a homogeneous catalog of data for a large fieldwith stellar objects delineating membership to the association Sco-Cenand that affect the luminosity function of the aggregate.

CCD measurements of visual binaries
CCD measurements of visual double stars were obtained with the ESO 1.5 mdanish reflector. All binaries observed are candidates for the HIPPARCOSInput Catalogue. More than 400 observations have been made in four clearnights. The accuracy obtained is comparable to the accuracy of thephotographic technique, but the observing and reduction times are oneorder of magnitude smaller.

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Observation and Astrometry data

Constellation:Centaurus
Right ascension:11h39m10.66s
Declination:-57°44'22.1"
Apparent magnitude:7.228
Distance:355.872 parsecs
Proper motion RA:-19.3
Proper motion Dec:21.1
B-T magnitude:7.21
V-T magnitude:7.227

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 101312
TYCHO-2 2000TYC 8638-404-1
USNO-A2.0USNO-A2 0300-13444937
HIPHIP 56841

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