Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esabu..37...86s&link_type=abstract
ESA Bulletin (ISSN 0376-4265), no. 37, Feb. 1984, p. 86-90.
Astronomy and Astrophysics
Astronomy
Astronomical Catalogs, Data Bases, European Space Agency, Computer Programs, Exosat Satellite, Position (Location), Spaceborne Astronomy, Stellar Magnitude, X Ray Sources
Scientific paper
The design and capabilities of the astronomical-data-base (ADB) facilities developed by ESA for space observation missions are surveyed, and an improvement is suggested. The primary aims of the ADB are to provide rapid access to information about objects to be observed, to prepare predicted-field-of-view maps in different spectral ranges, and to support spacecraft pointing instruments. The basic terminology used in the ADB is introduced, and the star-catalog facility (SCF) is characterized. The SCF permits the user to assemble an ADB from published source catalogs, make some corrections of one source from another, generate a mission catalog of the objects of interest, extract subsets of the mission catalog for a specific observational run, and generate maps using associated graphics packages. The catalog compiled for the Exosat mission contains basic data on 435,000 objects, and a conversational-access X-ray ADB facility provides more extensive data on up to 5000 objects. A data-retrieval scheme based on a cubic projection onto the celestial sphere is proposed and illustrated graphically.
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