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HD 194805


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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.

Micrometer Measures of Double Stars
Micrometer measures of 795 double stars made with the 26 inch (0.66 m)refractor of the US Naval Observatory from 1984 to 1990 are presented.

Mesures d'etoiles doubles faites a Nice, etoiles doubles nouvelles (24eme serie) decouvertes a Nice.
Table 1 gives 1182 measurements of 682 binaries observed with the 74 and50 cm refractors. Table 2 lists 26 new binaries discovered with the 50cm refractor.

Mesures d'étoiles doubles faites au réfracteur de 38 cm de l'Observatoire de Nice
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Observation and Astrometry data

Constellation:Petit Renard
Right ascension:20h26m46.31s
Declination:+28°04'04.3"
Apparent magnitude:8.841
Distance:343.643 parsecs
Proper motion RA:1.7
Proper motion Dec:6.9
B-T magnitude:9.055
V-T magnitude:8.859

Catalogs and designations:
Proper Names
HD 1989HD 194805
TYCHO-2 2000TYC 2164-1424-1
USNO-A2.0USNO-A2 1125-16003992
HIPHIP 100839
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