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QUERY(1) User Commands QUERY(1)


query - query remote data servers and download


astquery [OPTION...] DATABASE


query is part of GNU Astronomy Utilities 0.14. query is just a place holder used as a minimal set of files and functions necessary for a program in Gnuastro. It can be used for learning or as a template to build new programs.

For more information, please run any of the following commands. In particular the second contains a very comprehensive explanation of query's invocation: expected input(s), output(s), and a full description of all the options.

All options and their values:
$ astquery -P
Inputs/Outputs and options:
$ info astquery
Full section in manual/book:
$ info query
Full Gnuastro manual/book:
$ info gnuastro

If you couldn't find your answer in the manual, you can get direct help from experienced Gnuastro users and developers. For more information, please run:

$ info help-gnuastro

query options:

Coordinate (RA, Dec) column names in dataset.
-h, --hdu=STR/INT
Extension name or number of input data.
-L, --limitinfo=STR
Only retrieve dataset info. with this string.
-Q, --query=STR
The raw query as a simple string.
-v, --overlapwith=STR
Set query region to overlap with this image.
Only print the download command, don't run it.
-D, --dontdelete
Don't delete output if it exists.
-i, --information
Print database or dataset information.
-k, --keeprawdownload
Don't delete raw downloaded file.
-K, --keepinputdir
Keep input directory for automatic output.
-o, --output=STR
Output file name.
Table fmt: 'fits-ascii', 'fits-binary', 'txt'.
Generate query internally (not compatible with '--query'):
-b, --noblank=STR[,STR]
No rows with blank value in given column(s).
-c, --column=STR
Column names to download from catalog.
-C, --center=FLT,FLT
Center coords. to select by region in sky.
-g, --range=STR,FLT:FLT
Range of selected targets in given column.
-H, --head=INT
Only download given number of top rows.
-r, --radius=FLT
Radius around --center to select targets.
Sort based on values of given columns.
-s, --dataset=STR
Name of dataset in database.
-w, --width=FLT[,FLT]
Width of box around --center to select targets.
Operating modes:
-?, --help
give this help list
List all config files and variables read.
BibTeX citation for this program.
Read configuration file STR immediately.
Do not parse any more configuration files.
Only run if the program version is STR.
-P, --printparams
Print parameter values to be used and abort.
-q, --quiet
Only report errors, remain quiet about steps.
-S, --setdirconf
Set default values for this directory and abort.
give a short usage message
-U, --setusrconf
Set default values for this user and abort.
-V, --version
print program version

Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

GNU Astronomy Utilities home page:


Report bugs to


Copyright © 2015-2021, Free Software Foundation, Inc. License GPLv3+: GNU General public license version 3 or later.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

Written/developed by Mohammad Akhlaghi


The full documentation for query is maintained as a Texinfo manual. If the info and query programs are properly installed at your site, the command
info query

should give you access to the complete manual.

January 2021 GNU Astronomy Utilities 0.14