The ICRS constitutes the set of prescriptions and conventions together with the modelling required to define at any time a triad of axes. The System is realised by VLBI estimates of equatorial coordinates of a set of extragalactic compact radio sources, the International Celestial Reference Frame ( ICRF). The ICRS can be connected to the International Terrestrial Reference System (ITRS) by use of the IERS Earth Orientation Parameters (EOP).
| Contents | Equator/Pole and origin of Right Ascension. | |
| Accuracy | Pole: | 50 mas |
| Origin of R.A.: | 10 mas | |
| Updates | / | |
| Public access | http://hpiers.obspm.fr/icrs-pc/newwww/index.php | |
| Format | / | |
| Documentation | IERS Technical Note No. 23 IERS Conventions 2003, IERS Technical Note 32: 2. Conventional Celestial Reference System and Frame (PDF, 160KB, Not barrier-free file.) (not accessible) [PDF, 160 KB] http://hpiers.obspm.fr/icrs-pc/newwww/index.php | |
| Product Centre | IERS ICRS Centre | |
