NRAO

GBT Pointing Source Catalog

The traditional pointing model corrects for repeatable pointing errors that change on timescales of months but not days. These errors can typically be associated with physical imperfections in the telescope structure (e.g., tilt of the azimuth track). Nonrepeatable pointing errors are more difficult to characterize and may vary on timescales of tens of minutes and with telescope position. They are frequently dominated by thermal effects. Offset pointing using nearby calibrators can be used to correct for nonrepeatable errors.

J. J. Condon and Q. F. Yin have generated a list of 3399 calibrators for large radio telescopes from the NRAO VLA Sky Survey (NVSS) which uniformly covers the sky north of declination -40 deg (Condon & Yin, 2001, ASP 113, 362). The NVSS pointing catalog can be accessed using the GBT observing interface. Below are links to the catalog.

NVSS Caltalog Information (ASCII)

NVSS Caltalog (ASCII)

 
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Last modified: Wed Oct 23 22:12:59 EDT 2002