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+.TH SCAT 7
+.CT 1 inst_info
+.SH NAME
+scat \- sky catalogue
+.SH SYNOPSIS
+.B scat
+.SH DESCRIPTION
+.I Scat
+looks up items in catalogues of objects
+outside the solar system.
+Items are read, one per line, from the standard input, and their
+descriptions or cross-index listings (suitable for input to
+.IR scat )
+are printed on the standard output.
+An item is in one of the following formats:
+.TP
+.B ngc1234
+Number 1234 in the Revised New General Catalogue of
+Nonstellar Objects.
+The output identifies the type 
+.RB( eg =galaxy,
+.BR pn =planetary
+nebula, 
+.BR gc =globular
+cluster, 
+.BR oc =open
+cluster, 
+.BR dn =diffuse
+nebula or 
+.BR nc =nebular
+cluster),
+possibly contained within the Large Magellanic Cloud 
+.RB ( in\ lmc )
+or Small
+Magellanic Cloud 
+.RB ( in\ smc ),
+its position in 2000.0 coordinates
+and galactic coordinates, and a brief description.
+.TP
+.B sao12345
+Number 12345 in the Smithsonian Astrophysical Star Catalogue.
+Output identifies the visual and photographic magnitudes,
+2000.0 coordinates, proper motion, spectral type, multiplicity and variability
+class, and HD number.
+.TP
+.B m4
+Catalog number 4 in Messier's catalog.
+The output is the NGC number.
+.TP 
+\f5"alpha umi"\fP
+Star names are provided in double quotes.
+Known names are the Greek
+letter designations, proper names such as Betelgeuse, and bright variable stars.
+Constellation names must be the three-letter abbreviations.
+The output
+is the SAO number.
+For non-Greek names, SAO numbers and names are listed for all stars with
+names for which the given name is a prefix.
+.TP
+.B 12h34m -16
+Coordinates in the sky are translated to the nearest `patch',
+approximately one square degree of sky.
+The output is the coordinates identifying the patch,
+the constellations touching the patch, and the NGC and SAO
+objects in the patch.
+.TP
+.B c umi
+Gives voluminous output consisting of the patches covering the
+named constellation.
+.SH FILES
+.F /n/kwee/usr/rob/sky2/*.sky
+.SH SEE ALSO
+.IR sky (7)
+.br
+.B /n/kwee/usr/rob/sky2/constelnames
+for the three-letter abbreviations of the constellation names.
+.SH BUGS
+The database is fine, but the program is feeble.
+.br
+Coordinates printed by the program in
+the listings for SAO and NGC objects are not understood as input.