CDS news

Use X-Match service for queries from coordinates

Posted by CDS admin on 05 April 2013 14:31 CEST

If you are searching lots of Simbad objects (and only get some basic data) from coordinates, it will be much more powerful using the "X-Match" service instead of using the Simbad script mode.

If you are searching lots of Simbad objects (and only get some basic data) from coordinates, it will be much more powerful using the "X-Match" service instead of using the Simbad script mode.

This X-Match service allows one to cross-identify sources coming from any two tables (including Simbad, Vizier, or your uploaded table).

Output data from Simbad database are limited, for instance, you can get :
main identifier, ra, dec, B, V, R, J, H, K, object type, proper motion, spectral type ...

You can also use an API allowing one to access programmatically its cross-match service. Through HTTP calls, any script or program can submit a list of positions (up to 2 million positions) and look for counterparts in Simbad.

You can use the online documentation :
http://cdsxmatch.u-strasbg.fr/xmatch/doc/
You will find here some usage examples in several languages (shell script, Python, Ruby, Java).

Your comments, questions or feedback are welcome and can be sent to [email=cds-question@unistra.fr][/email]


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