DIVISION I / COMMISSION 8 / WORKING GROUP ASTROGRAPHIC CATALOGUE AND CARTE DU CIEL PLATES

BEATRICE BUCCIARELLI; ALAIN FRESNAU; CARLOS ABAD; ROBERT W. ARGYLE; JAMES BIGGS; NOAH BROSCH; GEORGE V. COYNE; EMMANUAEL DAVOUST; JEAN-PIERRE M. DE CUYPER; EDWIN L. VAN DESSEL; CHRISTINE DUCOURANT; IVAN H. BUSTOS FIERRO; MICHAEL GEFFERT; ELENA V. GLUSHKOVA; MICHAEL J. IRWIN; DAYTON L. JONES; KARI A. LUMME; J. L. MUI˜NOS; MICHAEL ODENKIRCHEN; ROSA B. ORELLANA; THIERRY PAUWELS; THEODORE J. RAFFERTY; M. SANCHEZ; J¨ORG SANNER; MILCHO K. TSVETKOV; ALAN E. VAUGHAN

Transactions IAU

Cambridge Journals

Lugar: Cambridge; Año: 2008 vol. 3 p. 95 - 97

Various experiments have definitely demonstrated that one-micron accuracy (0.06) on the definition of stellar images on CdC plates cannot be claimed, as it was speculated back in 1999. More realistically, a 2-3 micron accuracy is achievable, getting worse toward the survey magnitude limit, with an average magnitude error of 0.3. The level of astrometric accuracy corresponds to a 0.2 - 0.3 error in position at Epoch 1900, which, once used as first Epoch for proper motion determination in combination with modern epoch observations, can produce errors at the level of 2-5 mas/yr, thereby allowing to detect stellar motions larger than 0.01/yr, which at a distance of 500 pc from the Sun correspond to ∼25-60 km/s tangential velocity. Therefore, the AC/CdC heritage collection can be regarded as a highly valuable first-epoch material, e.g., for the realization of a Tycho-2 extension to fainter magnitudes (∼15 photographic), especially in selected areas where radial velocity data are available, for the exploration of stellar kinematics beyond our solar neighborhood. In the following I present a possibly non-exhaustive list of efforts that, since the last IAU in Prague, have been undertaken to digitize parts of the AC/CdC collections pertaining to the different zones, with the twofold intent of exploiting the scientific potential of these plates and making the digitized images available to the community.∼25-60 km/s tangential velocity. Therefore, the AC/CdC heritage collection can be regarded as a highly valuable first-epoch material, e.g., for the realization of a Tycho-2 extension to fainter magnitudes (∼15 photographic), especially in selected areas where radial velocity data are available, for the exploration of stellar kinematics beyond our solar neighborhood. In the following I present a possibly non-exhaustive list of efforts that, since the last IAU in Prague, have been undertaken to digitize parts of the AC/CdC collections pertaining to the different zones, with the twofold intent of exploiting the scientific potential of these plates and making the digitized images available to the community.∼15 photographic), especially in selected areas where radial velocity data are available, for the exploration of stellar kinematics beyond our solar neighborhood. In the following I present a possibly non-exhaustive list of efforts that, since the last IAU in Prague, have been undertaken to digitize parts of the AC/CdC collections pertaining to the different zones, with the twofold intent of exploiting the scientific potential of these plates and making the digitized images available to the community.