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 Alternate sites for USNO-B1.0 access?
   
joel
 12/01/2008 11:11PM (Read 3265 times)  
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I have usnob1@noao defined in my astcat$lib/catdb.dat as defined in previous posts. It sometimes works, but often is hangs and eventually the connection times out. I know there are other USNO-B1.0 servers out there, but I can't seem to get the syntax correct for the database. Does someone have entries I can cut-and-paste for other USNO-B1.0 servers?Also, the usnob1@noao server returns stars within a radius even though rrawidt and rdecwid are separately defined in aregpars. Is there a way to force AGETCAT to really get a rectangular region, or is this hardwired in the usnob1@noao definition in the database?Thanks,
jp

 
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fitz
 12/01/2008 11:11PM  
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I've uplaoded an alternative catdb.dat file that contains entries for USNO catalogs (USNO-A2, USNO-B1, NOMAD and ACT), this is available athttps://iraf.net/ftp/pub/fitz/catdb.datYou can download this and install in noao$astcat/lib and you should be able to access the catalogs at the alternative site.As for getting a rectangular region: The data queries are based on a radius and in cases where regions are being used but the ra/dec width differ, the max width is used in the query. If you want a rectangular region you'll need to filter the result table, e.g. using TSELECT from the TABLES package.-Mike

 
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joel
 12/01/2008 11:11PM  
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Great, thanks Mike!
I note the default format of the output catalog from usnob1@usno is somewhat different than that from usnob1@noao. I would like to force all output to be in sexigesimal format, which seems should be with the appropriate foraformat, e.g.[code:1:9e90fe92c7]agetcat filter+ fields="ra,dec,mag1" fsort="ra" catalog=usnob1@usno foraformat="%12.3H"[/code:1:9e90fe92c7]However, that doesn't seem to change the actual format of the output, it only changes the descriptor for that field in the output header.For instance, here is the output for the usnob1@noao, followed by the same for the usnob1@usno.[quote:9e90fe92c7]
# BEGIN CATALOG HEADER
# catdb astcat$lib/catdb.dat
# catname usnob1@noao
# nquery 4
# ra 4:17:15.39 hours
# dec 22:55:45.4 degrees
# radius 5.1 minutes
# qsystem J2000.0 INDEF
# type btext
# nheader 1
# csystem J2000.0
# nfields 3
# ra 1 12 d hours %12.3H
# dec 13 12 d degrees %12.2h
# mag1 25 4 r INDEF %4.2f
# END CATALOG HEADER
#
04:16:53.486 +22:55:23.83 15.6
04:16:53.678 +22:55:38.09 19.9
04:16:53.684 +22:55:31.53 17.5
[/quote:9e90fe92c7]
[quote:9e90fe92c7]
# BEGIN CATALOG HEADER
# catdb astcat$lib/catdb.dat
# catname usnob1@usno
# nquery 3
# ra 64.31414 degrees
# dec 22.92926 degrees
# radius 0.085 degrees
# type stext
# nheader 1
# csystem J2000
# nfields 2
# ra 1 0 r degrees %12.3H
# dec 2 0 r degrees %11.7f
# END CATALOG HEADER
#
04.28152389 +22.9232861
04.28157722 +22.9272472
04.28157889 +22.9254250
[/quote:9e90fe92c7]Am I missing some additional flag to force the change in the RA format?jp

 
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