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ICRF1-Ext.2 - The 2nd maintenance and extension of the ICRF1
The ICRF1 maintenance and extension catalogue, ICRF1-Ext.2, includes updated coordinates for the 608 extragalactic radio sources from the ICRF1, as well as the addition of 109 new sources. It incorporates VLBI data collected between May 1999 and May 2002, along with data from earlier observations.
| Content |
This dataset provides the equatorial coordinates of extragalactic radio sources observed at J2000.0 using Very Long Baseline Interferometry (VLBI). Number of objects: 717 | |
| Accuracy | The uncertainties in the coordinates are provided for each object and are given in the following ranges: | |
| Right Ascension [s] | 0.000017 - 0.017806 | |
| Declination ["] | 0.00025 - 0.20675 | |
| Updates |
Updates to the ICRF are released at irregular intervals, typically every few years. | |
| Public access |
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| Format |
For a detailed description of the format, refer to the contents of the data file. | |
| Documentation |
Fey, A. L.; Ma, C.; Arias, E. F.; Charlot, P.; Feissel‑Vernier, M.; Gontier, A.‑M.; Jacobs, C. S.; Li, J.; MacMillan, D. S. (2004). The Second Extension of the International Celestial Reference Frame: ICRF‑EXT.1. The Astronomical Journal, 127(6), 3587‑3608. https://doi.org/10.1086/420998 | |
| Product center | ||