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HD 28283


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Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.

Visual multiples. VIII - 1000 MK types
A total of 1000 new classifications are given for stars brighter than B= 8.0 mag in the Aitken double star catalog. The classificationssupplement 865 classifications obtained in 1981 and 1984. Among thenewly discovered stars are 12 new Ap stars, eight Lambda Bootis stars,one Ba II star, and 60 Am stars. A detailed list of the newclassifications is given.

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Observation and Astrometry data

Constellation:Taureau
Right ascension:04h28m02.96s
Declination:+10°04'19.8"
Apparent magnitude:7.486
Distance:106.952 parsecs
Proper motion RA:-13.3
Proper motion Dec:-15.8
B-T magnitude:7.747
V-T magnitude:7.508

Catalogs and designations:
Proper Names
HD 1989HD 28283
TYCHO-2 2000TYC 672-1019-1
USNO-A2.0USNO-A2 0975-01003264
HIPHIP 20845

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