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HD 51317


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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.

Interstellar reddening in the Southern Hemisphere. I - The UVBY beta observations
The uvby-beta photometric data obtained from a Southern Hemisphereobservational project is presented. A uvby-beta photometric network ofnearly 3900 A and early F stars has been established with the intentthat the stars serve as 'space probes' for measurements of interstellarreddening.

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Osservazione e dati astrometrici

Costellazione:Poppa
Ascensione retta:06h54m36.60s
Declinazione:-45°53'33.0"
Magnitudine apparente:9.062
Distanza:413.223 parsec
Moto proprio RA:2
Moto proprio Dec:25.6
B-T magnitude:9.41
V-T magnitude:9.091

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 51317
TYCHO-2 2000TYC 8117-1957-1
USNO-A2.0USNO-A2 0375-02885539
HIPHIP 33201

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