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HD 151630


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Absolute proper motions for the calibration of the HIPPARCOS proper motion system
Absolute proper motions of 48 Hipparcos stars in nine fields distributedover the northern hemisphere are presented. The proper motions have beenrecently used as part of the Bonn program for the extragalactic link ofthe Hipparcos proper motion system. We describe methods which have ledto the absolute proper motions of the major part of the Bonn fields forthe link. For six fields the extragalactic calibration was achievedusing the bright quasar in the centre of the field. In addition, data ofthree fields of globular clusters were included. For these fields thelink to an extragalactic reference system was performed by stars, whoseabsolute proper motions with respect to galaxies were determined onplates of the Lick astrograph. In addition, we used for the link in onefield plates from the ESO Schmidt telescope in combination withmeasurements from glass copies of the Palomar Sky Survey. The accuracyof a single proper motion is of the order of 2 to 3 mas/a for eachcoordinate. Table 2 is also available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html}

Die kugelfoermigen Sternhaufen Messier 12 und Messier 5
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Observation and Astrometry data

Constellation:Ophiucus
Right ascension:16h48m40.35s
Declination:-01°52'09.9"
Apparent magnitude:9.34
Proper motion RA:-4.5
Proper motion Dec:1.7
B-T magnitude:9.768
V-T magnitude:9.376

Catalogs and designations:
Proper Names
HD 1989HD 151630
TYCHO-2 2000TYC 5050-38-1
USNO-A2.0USNO-A2 0825-09698324
HIPHIP 82274

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