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HD 166993


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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.

ICCD speckle observations of binary stars. V - Measurements during 1988-1989 from the Kitt Peak and the Cerro Tololo 4 M telescopes
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1990AJ.....99..965M&db_key=AST

Micrometer measures of double stars.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1962AJ.....67..141V&db_key=AST

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Observation and Astrometry data

Constellation:Serpent
Right ascension:18h13m18.59s
Declination:-03°24'24.4"
Apparent magnitude:8.363
Distance:207.9 parsecs
Proper motion RA:0.7
Proper motion Dec:2.5
B-T magnitude:9.032
V-T magnitude:8.419

Catalogs and designations:
Proper Names
HD 1989HD 166993
TYCHO-2 2000TYC 5101-169-1
USNO-A2.0USNO-A2 0825-11982270
HIPHIP 89300
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