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Digitised Sky Survey
Browser help
Overview
The LEDAS Digitised Sky Survey service returns images of the night sky, with the
coordinates and field size requested. Images are available from the first-generation
DSS (DSS-I), and from the second-generation DSS (DSS-II) in three colours (Red, Blue, IR).
Images can be displayed in GIF format with coordinate grids overlaid, and science data is
returned in FITS and NDF format. For more information on the Digitised Sky Survey, see the
DSS site at STScI.
Coordinates or object name
Enter coordinates in the box supplied, either in decimal or
sexagesimal format, for example
12 34 56.67s, -23 45 56 (sexagesimal)
12.34567, -45.678 (decimal hours RA, decimal degrees dec)
Alternatively, enter the name of a celestial object and press the ``Resolve
name'' button, which will retrieve the coordinates from the SIMBAD
name resolver.
Field size
Enter the field size (eg. 10 x 10) and select the units
Restrictions
The field size must be larger than 17", and smaller than 1.8 degrees.
Service time
The time taken to service a request depends on the size of the
requested image, whether it overlaps the edge of a plate, and which
survey is requested. DSS-I requests query image data stored locally
at LEDAS. DSS-II requests are made over the network to the image
server at ESO, and will
therefore be significantly slower. A typical 10'x10' DSS-I image close
to the centre of a plate will be returned in a few seconds, whereas a
1x1 degree image could overlap three or four separate plates, and may
take a minute or more to be fulfilled.
Back to Request Form
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