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susa2
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susa2
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By default, only the brightest 100 objects (or closest 100, if the -s p option is used) are returned. Use the -n option to increase this number.
Output is to standard out, unless the -w flag is set, in which case it goes to objectname.usa1 or search.usa1. It is somewhat similar to RGSC, which can search from lists of coordinates but cannot sort the output. The USA2 number is the zone ((90 + declination in degrees) * 10) followed by the sequence number of the star within the RA-sorted zone. This number will change with each release of the SA catalog.
Set the environment variable USA2_PATH to the directory containing the CDROM. If the environment variable is not set, the default is to look at /data/usnosa20.
