This table contains the metadata for the plates that went into USNO-B
1.0 as best as we can reconstruct it (i.e., largely those that also
make up the Digital Sky Survey DSS). Most of the source files were
obtained from http://www.nofs.navy.mil/data/fchpix/, some additional
contributions came from Dave Monet.
The Wide-field Infrared Survey Explorer (WISE) is a space-based imaging
survey of the entire sky in the 3.4 (W1), 4.6 (W2), 12 (W3), and 22 (W4) μm
mid-infrared. This is the project's reliable Source Catalog containing
accurate photometry and astrometry for over 500 million objects.
More details are available in the `Explanatory Supplement`_, which also
has a list of `Cautionary Notes`_.
.. _Explanatory Supplement: http://wise2.ipac.caltech.edu/docs/release/allsky/expsup/sec1_1.html
.. _Cautionary Notes: http://wise2.ipac.caltech.edu/docs/release/allsky/expsup/sec1_4b.html
The SPM4 Catalog contains absolute proper motions, celestial
coordinates, and B,V photometry for 103,319,647 stars and galaxies
between the south celestial pole and -20 degrees declination. The
catalog is roughly complete to V=17.5. It is based on photographic and
CCD observations taken with the Yale Southern Observatory's
double-astrograph at Cesco Observatory in El Leoncito, Argentina.