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TYC 3460-1362-1


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Toward the HIPPARCOS link: astrometry of stars and extragalactic sources in the field of the spiral galaxy M51.
We present absolute proper motions of 14 Hipparcos stars from groundbased photographic astrometry in a 2x2deg field around the spiral galaxyMessier 51. These are part of a catalogue of 340 stars with B<=16,for which positions, proper motions, and B magnitudes have been derivedfrom a series of 16 photographic plates. Due to large epoch differencesof up to 88 years between the observations, the proper motion accuracyis typically <=1mas/a. An extragalactic calibration of the propermotion zero-point is achieved by measuring the fictitious proper motionsof bright extragalactic objects in the field. For this purpose, across-correlation technique was developed. The resulting precision ofthe proper motion link to an extragalactic frame is estimated as1.0mas/a. Measurements of double stars and high proper motion stars arealso discussed.

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Observation and Astrometry data

Constellation:Canes Venatici
Right ascension:13h22m43.95s
Declination:+47°11'12.6"
Apparent magnitude:9.234
Proper motion RA:-121.4
Proper motion Dec:-18.8
B-T magnitude:10.221
V-T magnitude:9.316

Catalogs and designations:
Proper Names
TYCHO-2 2000TYC 3460-1362-1
USNO-A2.0USNO-A2 1350-08267601
HIPHIP 65276

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