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HD 24989


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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.

UVBY photometry of HIPPARCOS stars
Photoelectric data in the uvby system have been obtained for 367southern stars of the Hipparcos Input Catalogue. Most of the stars are Fand G main sequence and fall in the magnitude range V = 9 to 10.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Saat
Sað Açýklýk:03h56m27.69s
Yükselim:-42°37'33.1"
Görünürdeki Parlaklýk:10.1
özdevim Sað Açýklýk:20
özdevim Yükselim:-2.6
B-T magnitude:10.898
V-T magnitude:10.166

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 24989
TYCHO-2 2000TYC 7576-86-1
USNO-A2.0USNO-A2 0450-01346703
HIPHIP 18429

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