This database is maintained by the Smithsonian Astrophysical Observatory (SAO) and contains over 11.6 million records. The contents include astronomy, astrophysics, and physics.
This survey was coordinated at the Infrared Processing and Analytical Center (IPAC) of NASA on the California Institute of Technology campus. It covers the entire sky both northern and southern hemispheres in the near infrared spectrum of approximately two microns.
The National Radio Astronomy Observatory did a survey of the sky at 1.4 Gigahertz using a Very Large Array. The objects surveyed in the northern hemisphere were located at -40 degrees declination. The survey includes objects from the southern tropical latitudes.
This project also used the NRAO VLA to look at the galactic north and south caps initially at the 1365 and 1435 Megahertz wavelengths. The first sweep was done from 1993 to 1994. More data has been collected since then.
This archive of images and spectra are housed at the Space Telescope Science Institute on the Johns Hopkins University campus. Most of the data sets focus on optical, ultraviolet and near-infrared parts of the spectrum.