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HD 101387


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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.

Visual measures of 193 double and multiple stars
Micrometer measurements of 174 double stars obtained with 26 1/2-in. and10-in. refractors are presented, along with interferometric measurementsof 19 double stars performed using 20-in. and 36-in. reflectors. Theresults reported include star coordinates, position angles, separations,probable errors, orbital residuals, and identifications of wide doubleswith separations of up to 2 arcmin.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Su Yilani
Sað Açýklýk:11h39m57.03s
Yükselim:-33°26'59.6"
Görünürdeki Parlaklýk:6.857
Uzaklýk:145.56 parsek
özdevim Sað Açýklýk:-51.4
özdevim Yükselim:-23.3
B-T magnitude:8.326
V-T magnitude:6.979

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 101387
TYCHO-2 2000TYC 7220-1242-1
USNO-A2.0USNO-A2 0525-14332689
HIPHIP 56908

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