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HD 20002


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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 finding list of stars of spectral type A7 and earlier in regions at high galactic latitudes. VI. Near South Galactic Pole.
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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Ocak
Sað Açýklýk:03h11m51.93s
Yükselim:-30°16'36.1"
Görünürdeki Parlaklýk:8.985
Uzaklýk:192.678 parsek
özdevim Sað Açýklýk:-2.1
özdevim Yükselim:0.3
B-T magnitude:9.283
V-T magnitude:9.01

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 20002
TYCHO-2 2000TYC 7019-728-1
USNO-A2.0USNO-A2 0525-01080936
HIPHIP 14855
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