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HD 237980


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Mining in the HIPPARCOS raw data
The Hipparcos solutions flagged as unreliable after the completion ofthe standard data processing have been systematically revisited in thelight of additional information, primarily related to theirmultiplicity. In many cases improved solutions have been obtained,yielding at the same time an Hipparcos based separation and positionangle and a better astrometric solution for the system. The principlesapplied in this reprocessing are explained and more than a hundred newsolutions with absolute and relative astrometry are presented anddiscussed. Tables 1 to 7 are also available in electronic form at theCDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html

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Observation and Astrometry data

Constellation:Ursa Major
Right ascension:11h15m22.88s
Declination:+58°24'06.1"
Apparent magnitude:10.052
Proper motion RA:16.6
Proper motion Dec:1.4
B-T magnitude:10.695
V-T magnitude:10.106

Catalogs and designations:
Proper Names
HD 1989HD 237980
TYCHO-2 2000TYC 3830-890-1
USNO-A2.0USNO-A2 1425-07632459
HIPHIP 54972

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