varsao on 25-Apr-2011 19:46:03 GMT about III/254/crvad2 (The catalogue of radial velocities of galactic stars with high precision astrometric data, the 2nd version (CRVAD-2))
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Z Sgr is a M-type mira varyng from 8.35 to 16.0 in V.
Its position and identification determined from its 2MASS red colors is 19 19 43.21 -20 55 34.7 (J2000.0, 2MASS)
The star is not TYC 6308-1927-1 which is at 19 19 43.03 -20 56 10.3 (J2000.0, Tycho-2) and has a V-mag of 11.2. THIS STAR IS NOT THE RED GIANT.
ID is wrong in all Kharchenko et al. catalogues.
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View annotation on table III/254/crvad2