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Leicester Database and Archive Service
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Digitised Sky Survey

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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.

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If you have any problems using this system, please consult the help page or mail LEDAS Support
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