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TYC 3463-673-1


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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:Chiens de chasse
Right ascension:13h34m24.88s
Declination:+46°24'27.8"
Apparent magnitude:8.48
Distance:292.398 parsecs
Proper motion RA:-0.9
Proper motion Dec:3
B-T magnitude:9.961
V-T magnitude:8.603

Catalogs and designations:
Proper Names
TYCHO-2 2000TYC 3463-673-1
USNO-A2.0USNO-A2 1350-08298076
HIPHIP 66228

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