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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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观测天体数据

星座:天燕座
右阿森松:18h10m34.46s
赤纬:-75°11'30.1"
视星:8.609
距离:393.701 天文距离
右阿森松适当运动:3.4
赤纬适当运动:-14.7
B-T magnitude:8.648
V-T magnitude:8.613

目录:
适当名称
HD 1989HD 164644
TYCHO-2 2000TYC 9445-2575-1
USNO-A2.0USNO-A2 0075-06037132
HIPHIP 89051

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