Based on the digitisation of the POSS-II Sky Atlas
3 colors (JFN calibrated to gri)
Optimal plate digitisation at STScI: 1 arcsec pixels, improved photometry,
dynamical range
3 Terabytes of pixels, 1 Terabyte of reduced data
An extensive CCD calibration effort at the P60
Processing at Caltech involves AI techniques for automated object classification
The resulting Palomar-Norris Sky Catalog will contain over 50 million
galaxies and 2 billion stars, down to the effective limiting magnitude
of B ~ 22 mag
A precursor to the Sloan DSS, with the data publicly available several
years ahead of the SDSS
The future of the wide-field imaging telescopes, e.g. P48 Oschin Schmidt:
fully digital sky surveys, searches for the Earth-crossing objects
