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HD 239868

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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.
A Wide-Angle Astrometric Standard in the Moscow Zenith Zone Not Available
Etude pour chaque champ de l'absorption et de la repartition des vitesses radiales EN fonction de la distance. Not Available

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Observation and Astrometry data

Constellation:	Kepheus
Right ascension:	22^h09^m21.29^s
Declination:	+58Â°03'43.3"
Apparent magnitude:	9.33
Proper motion RA:	4.4
Proper motion Dec:	2.5
B-T magnitude:	9.643
V-T magnitude:	9.356

Catalogs and designations:

Proper Names	(Edit)
HD 1989	HD 239868
TYCHO-2 2000	TYC 3977-121-1
USNO-A2.0	USNO-A2 1425-12898745
HIP	HIP 109358

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