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Interactive Catalog and Image Search

Interactive search service on the PMM Image database and the NOMAD, USNO-B1 and USNO-A2 catalogs. This service extracts all the objects within a user specified radius or box around a single point in the sky.


Welcome to the USNO
Integrated Image and Catalog Archive Service

(Introduction | Guide | Service Notes | Interactive Search | VO Cone Search)


Image and Catalog Search Page

To extract a region from one of the image database and/or catalogs listed below, you will need to enter the RA and Dec of the center of the region, and either the width and height of, or the radius of the search region. Then click on the "Retrieve Data" button at the bottom of the form.

This form is populated with a reasonable starting set of default values.   As you go further down, you get to more and more specific items.  For basic usage, you need only enter a position (RA, Dec), select a box size (rawid, decwid) and hit the "Retrieve Data" button at the bottom of the form.   The rest of the form is there to help you tailor the output to your specific needs.

Information about any of the options is available in the Guide. 
Set the Field ID and request E-mail notification of job completion. The Field ID is just an ASCII string. The Email address is optional, and only if you desire to be notified when your request has finished processing
Enter position on the sky. RA is in hours (sexigesimal or decimal). Dec is in degrees (sexigesimal or decimal). Equinox (either J2000, or B1950) and Epoch.
Select region shape, and set regions size. Regions can be circular (size defined by radius) or rectangular (size defined by width and height).
cextract Extraction box shape - circular or rectangular


Select types of data to retrieve (catalog, image and/or finder chart), and choose file format and compression. For catalogs, file formats are either ASCII, or XML/VOTable.
Select input data sources.
Select catalog columns to retrieve, and pick primary sort key.
Additional magnitude related selection criteria when searching the catalogs.
Additional Position related constraints on catalog data selection.
Options governing the presentation of image and chart data.
Options for overplotting user supplied data.