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CCD astrometry and instrumental Delta-V photometry of wide visual double stars. III - Differential measurements of often observed southern pairs
We present accurate relative positions and instrumental visual (BesselV) magnitude differences of southern wide star components. The meanaccuracy of the angular separation is 0.02 arcsecs, which corresponds to1.5 micron on the CCD chip, and of magnitude difference 0.007mag/exposure. The program pairs are targets of the HIPPARCOS mission andthey have been observed at least four times in the last 150 yrs.
| Walraven photometry of nearby southern OB associations
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| CCD measurements of visual binaries
CCD measurements of visual double stars were obtained with the ESO 1.5 mdanish reflector. All binaries observed are candidates for the HIPPARCOSInput Catalogue. More than 400 observations have been made in four clearnights. The accuracy obtained is comparable to the accuracy of thephotographic technique, but the observing and reduction times are oneorder of magnitude smaller.
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Observation and Astrometry data
| Constellation: | Altar |
| Right ascension: | 17h52m41.38s |
| Declination: | -52°28'49.5" |
| Apparent magnitude: | 8.246 |
| Distance: | 578.035 parsecs |
| Proper motion RA: | 0 |
| Proper motion Dec: | -4.9 |
| B-T magnitude: | 8.253 |
| V-T magnitude: | 8.247 |
Catalogs and designations:
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