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HD 98022


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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.

A photometric study of wide visual double stars with significant relative proper motion
Photometric observations and uvby H-beta indices of 142 wide visualdouble stars are presented. Calibrations of the indices are used toderive MK class, color excess, absolute magnitude, effectivetemperature, and distance. The results are used to check candidatesdouble stars for the Hipparcos mission for opticity.

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Observation and Astrometry data

Constellation:Centaurus
Right ascension:11h15m53.68s
Declination:-47°55'15.1"
Apparent magnitude:6.542
Distance:158.479 parsecs
Proper motion RA:-19.2
Proper motion Dec:-9.7
B-T magnitude:6.508
V-T magnitude:6.54

Catalogs and designations:
Proper Names
HD 1989HD 98022
TYCHO-2 2000TYC 8217-2288-1
USNO-A2.0USNO-A2 0375-13333454
HIPHIP 55019

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