Dictionary of Nomenclature of Celestial Objects

Details on Acronym:   ACT
   ACT (Astrographic Catalogue, Tycho) Write:<<TYC FFFF NNNNN N>> N: 988758 Object:*  (SIMBAD class: Star) Note:The motivation of this catalogue was to provide accurate proper motions for the majority of the stars in the Tycho Catalogue.
The astrometric data contained in the ACT Reference Catalog include positions, proper motions and error estimates. These are on the Hipparcos System (J2000.0) for epoch J2000.0. Auth.:URBAN S.E.+

** catalog: use Tyc =E=Catalogue in electronic form as I/246 Originof the Acronym: A = Assigned by the author(s)

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