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Speckle Interferometry at the Observatorio Astronómico Nacional. II We present speckle interferometric measurements of binary stars madeduring June of 2009 with the 1.5 m telescope of the ObservatorioAstronómico Nacional at SPM (Mexico). The data contain 189position angle and separation measures of 144 systems. The measuredangular separations range from 0arcsec.16 to 3arcsec.64. The maximummagnitude of the brighter component is 10.96. The mean error inseparation is 0arcsec.02 and in the position angles 1.5°. Some ofthe position angles were determined with the usual 180° ambiguity.
| CCD measurements of visual double stars made with the 74 cm and 50 cm refractors of the Nice Observatory (2nd series) We present 619 measurements of 606 visual double stars made by CCDimaging from 1996 to 1999 with the 74 cm and 50 cm refractors of theNice observatory. Angular separation, position angle and magnitudedifference are given. Magnitude differences estimated from CCD imagesare compared with magnitude differences given in the Hipparcos catalog.The residuals in angular separation and position angle are computed forbinaries with known orbit. Table 2 is only available in electronic format the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) orvia http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/378/954
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| GPM - compiled catalogue of absolute proper motions of stars in selected areas of sky with galaxies. Not Available
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Observation and Astrometry data
Constellation: | Hercule |
Right ascension: | 17h48m33.64s |
Declination: | +23°39'09.3" |
Apparent magnitude: | 8.488 |
Distance: | 267.38 parsecs |
Proper motion RA: | -8.1 |
Proper motion Dec: | 19.8 |
B-T magnitude: | 9.89 |
V-T magnitude: | 8.604 |
Catalogs and designations:
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