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HD 30808


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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.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Boga
Sað Açýklýk:04h51m26.31s
Yükselim:+15°52'53.5"
Görünürdeki Parlaklýk:8.382
Uzaklýk:534.759 parsek
özdevim Sað Açýklýk:-1.4
özdevim Yükselim:0.1
B-T magnitude:10.04
V-T magnitude:8.519

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 30808
TYCHO-2 2000TYC 1280-214-1
USNO-A2.0USNO-A2 1050-01468257
HIPHIP 22568

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