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HD 101404


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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.

SANTIAGO 91, a right ascension catalogue of 3387 stars (equinox J2000).
The positions in right ascension of 3387 stars belonging to the Santiago67 Catalogue, observed with the Repsold Meridian Circle at Cerro Calan,National Astronomical Observatory, during the period 1989 to 1994, aregiven. The average mean square error of a position, for the wholeCatalogue, is +/-0.009 s. The mean epoch of the catalogue is 1991.84.

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Osservazione e dati astrometrici

Costellazione:Idra
Ascensione retta:11h40m00.91s
Declinazione:-30°28'48.1"
Magnitudine apparente:7.953
Distanza:129.702 parsec
Moto proprio RA:-68.9
Moto proprio Dec:-15
B-T magnitude:9.166
V-T magnitude:8.054

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 101404
TYCHO-2 2000TYC 7216-619-1
USNO-A2.0USNO-A2 0525-14333589
HIPHIP 56912

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