USNO

Description

The Data Lab hosts both USNO A2 and B1 as astrometric reference datasets. For description of these catalogs, see:

• USNO A2: Naval Oceanography Portal (http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/icas/icas-usno-a2-format)
• Monet et al. 2003, AJ, 125, 984 (http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/icas/2003.AJ.125.984M.pdf)

The usno.a2 table and usno.b1 table have been crossmatched against our default reference datasets within a 1.5 arcsec radius, nearest neighbor only. These tables will appear with x1p5 in their name in our table browser. Example: usno.x1p5__a2__gaia_dr3__gaia_source.

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Data Access

The USNO data are accessible by a variety of means:

Data Lab Table Access Protocol (TAP) service

TAP provides a convenient access layer to the USNO catalog database. TAP-aware clients (such as TOPCAT) can point to https://datalab.noirlab.edu/tap, select the usno database, and see the database tables and descriptions. You can also view the USNO tables and descriptions in the Data Lab table browser.

Data Lab Query Client

The Query Client is available as part of the Data Lab software distribution. The Query Client provides a Python API to Data Lab database services. These services include anonymous and authenticated access through synchronous or asynchronous queries of the catalog made directly to the database. Additional Data Lab services for registered users include personal database storage and storage through the Data Lab VOSpace.

The Query Client can be called from a Jupyter Notebook on the Data Lab Notebook server. Example notebooks are provided to users upon creation of their user account (register here), and are also available to browse on GitHub at https://github.com/astro-datalab/notebooks-latest.

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