[vsnet-chat 1506] Re: [AAVSO-DIS] usnoa search program

[bas@lowell.Lowell.Edu (Brian Skiff)]

     It is perhaps worth reminding reminding folks that one can do USNO-A2.0
catalogue searches using any of several on-line Web utilities.  This avoids
having to have the 7Gb catalogue on your own machine, and probably works
faster even than if it were.
     The easiest to use is the Strasbourg VizieR server and its mirror-copies
at Goddard and in Tokyo:

http://vizier.u-strasbg.fr/cgi-bin/VizieR

There are direct links for the moment at the top of this page for A2.0 and
for the USA and Japan mirror copies.  VizieR allows searches within specified
regions (square or circular), allows magnitude and colors limits to be set,
and so on.  It also allows one to supply a list of targets to search on.
Remember that because of the catalogue density, searches for areas larger
than a few arcminutes can produce extremely long lists in return.  Be careful
especially along the galactic plane!
     There is a similar search engine available from Lowell:

http://asteroid.lowell.edu/cgi-bin/koehn/webnet

...which allows similar search constraints, sort parameters, etc.  This site
allows searches in USNO-SA2.0 as well as the PPM catalogue.  Out can be as
flat ASCII, IRAF style, or binary.
     The ESO Web server presumably also has a search engine for A2.0, but
the top page wasn't responding when I looked for it just now, so can't
supply a direct URL.  It should be available somewhere starting from
http://vsnet.eso.org

Hope this helps.

\Brian

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