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HD 57286


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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 measurements of southern double stars. II
A group of 248 micrometric observations of 104 double stars arepresented, forming the second series of a program carried out at Cordobawith a 30 cm refractor. Usually neglected IDS pair south of -60 deg areselected for observation, most of them having been measured only one ortwo times previously. The measurements are compared with all the earlierobservations to derive estimates for the personal equation in P.A. andseparation, and the nature of many pairs is discussed by making use ofcatalog proper motions.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Ucan Balik
Sað Açýklýk:07h15m44.89s
Yükselim:-66°11'49.5"
Görünürdeki Parlaklýk:9.918
özdevim Sað Açýklýk:-6.4
özdevim Yükselim:22.3
B-T magnitude:10.445
V-T magnitude:9.962

Kataloglar ve belirtme:
Özgün isimleri
HD 1989HD 57286
TYCHO-2 2000TYC 8921-898-1
USNO-A2.0USNO-A2 0225-03464537
HIPHIP 35129

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