STScI will be performing network upgrades on the following dates:
Sat 8 May 2021, 7:00 AM - 4:00 PM EDT (11:00 - 20:00 UTC)
Sun 9 May 2021, 7:00 AM - 4:00 PM EDT (11:00 - 20:00 UTC)
Services may be unavailable or interrupted during these times.
The Digitized Sky Survey comprises a set of all-sky photographic surveys in E, V, J, R, and N bands
conducted with the Palomar and UK Schmidt telescopes. The Catalogs and Surveys Branch (CASB)
is digitizing the photographic plates to support HST observing programs but also as a service to the astronomical community.
The 6.5-degree x 6.5-degree plates are scanned using a modified PDS microdensitometer to a pixel scale of
about 1.7 arcseconds per pixel for the POSS, SERC, and Palomar Quick-V surveys, and to about 1.0
arcseconds per pixel for the POSS-II surveys.
Images of any part of the sky may be extracted from the DSS, in either FITS or GIF format.