Densification of the Optical Reference Frame (Commission 8)
Objectives and History
This group works towards obtaining high precision astrometry of optical sources and putting those on the system of the ICRS. This is being undertaken for the express purpose of increasing the density (number of stars per square degree) beyond that of the Hipparcos Catalogue, which defines the optical reference frame.
The Densification of the Optical Reference
Frame sub-group originated
under the International Celestial Reference System (ICRS) Working Group
sponsored by Division I of the International Astronomical Union. At the 2003 IAU
Assembly, the ICRS Working Group was essentially dissolved. The
of the Optical Reference Frame group was moved under
At the 2006 GA in Prague this WG was confirmed to continue for the
At left are links relevant to the
Densification sub-group, including a summary of the current status of Optical Astrometric Surveys.
last update: 2009 July 06