Last updated 09 May 2019

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Star Catalogues no longer used at Great Shefford

Star Catalogues

 

UCAC-3 (The Third US Naval Observatory CCD Astrograph Catalog) was released on a double sided DVD containing 8Gb of binary files during September 2009. Herbert Raab added support for UCAC-3 to Astrometrica in version 4.6.1.384 in January 2010 and  was used at Great Shefford from 7th January 2010 until February 2013 when support for UCAC-4 was made available. A number of improvements were made to the UCAC-2 catalogue (see here) including extending the coverage to the entire sky.

UCAC-2 (The Second US Naval Observatory CCD Astrograph Catalog) was released on three CDs by the USNO at the end of July 2003 and the CDs were received at Great Shefford a week or so later. By 19 Aug 2003 Herbert Raab had issued Astrometrica version 4.3.0.325 with support for the new catalogue.

UCAC2 did not cover the entire sky, but extended from the south pole to about +45 declination. See here a plot of the coverage from the USNO.

UCAC2 was used at Great Shefford for all reductions within its coverage.  Outside of this area USNO B1.0 was used (see below).

Magnitudes derived from measures using UCAC2 have been found to be about 0.5 mags fainter than the equivalent using the USNO A2 or B1 catalogues. 

USNO B1.0 was used at Great Shefford from 2003 March until 2003 August for all reductions reported to the MPC wherever possible. This catalogue is currently only available by downloading small parts over the web from http://www.nofs.navy.mil/data/FchPix/ . Astrometrica can use this catalogue directly.

USNO A2.0 contains 526 million stars and is used for telescope position synchronisation by Pinpoint from within Maxim DL/CCD during observing runs. It is obsolete for astrometric purposes as it does not include stellar proper motion information but at 5.9Gb is easily held on a hard disk and has good all-sky coverage.


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