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HD 164644


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A photometric study of wide visual double stars with significant relative proper motion
Photometric observations and uvby H-beta indices of 142 wide visualdouble stars are presented. Calibrations of the indices are used toderive MK class, color excess, absolute magnitude, effectivetemperature, and distance. The results are used to check candidatesdouble stars for the Hipparcos mission for opticity.

A Note about the Comparison Between the Old and New Slettebak Systems of Axial Rotational Velocities
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1984RMxAA...9....9G&db_key=AST

Rotational velocities and spectral types for a sample of binary systems.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1975A&AS...19...91L&db_key=AST

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Observation and Astrometry data

Constellation:Paradiesvogel
Right ascension:18h10m34.46s
Declination:-75°11'30.1"
Apparent magnitude:8.609
Distance:393.701 parsecs
Proper motion RA:3.4
Proper motion Dec:-14.7
B-T magnitude:8.648
V-T magnitude:8.613

Catalogs and designations:
Proper Names
HD 1989HD 164644
TYCHO-2 2000TYC 9445-2575-1
USNO-A2.0USNO-A2 0075-06037132
HIPHIP 89051
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