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: http://www.sao.ru/fetch/HL/leda/aladin.html
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IntroductionThe access to LEDA from Aladin allows to display the galaxies in a field centered on coordinates or on an object specified by its designation. This chart may be overlayed to an image from the DSS, Vizier database or any FITS image.Access by designationWhen a name is provided to Aladin, its position is searched in Simbad and LEDA is searched around this position. Therefore, note that (i) the target may not be correctly centered (or even not found) because the position assigned in LEDA may differ from the Simbad position and (ii) if the object's name is not recognized by Simbad the position can not be determined, even if this name is indexed in LEDA. In case of problem, give the coordinates of the target.Additional constraintsIt is optionally possible to specify additional constraints to filter the list of galaxies returned by LEDA.LEDA allows SQL selection on about 100 parameters. SQL is the query language used by database systems, you may easily find good manuals on the WEB. In practice the constraint passed from Aladin is attached with the where clause of the request. Examples of possible additional constraints are:
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