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Tracer | B1.0 to RadPos | GSC2.3 to RadPos | DR5 to RadPos |
N | 1962 | 2028 | 300 |
![]() |
-35.2 ![]() |
+32.9 ![]() |
-4.5 ![]() |
![]() |
+123.5 ![]() |
+39.5 ![]() |
+13.9 ![]() |
A1 | +4.7 ![]() |
-6.6 ![]() |
-3.5 ![]() |
A2 | +5.9 ![]() |
+13.1 ![]() |
-19.4 ![]() |
A3 | +42.1 ![]() |
-29.0 ![]() |
+6.6 ![]() |
A4N | +123.0 ![]() |
20.9 ![]() |
1.6 ![]() |
A4S | +128.0 ![]() |
134.1 ![]() |
a For the catalogs USNO B1.0, GSC2.3, and SDSS DR5 relatively to the collected sample of sources with precise radio interferometric positions (Extended Radio Frame - RadPos, either from ICRF-Ext2, VCS6 or VLAC), are presented: the average offsets in right ascension and declination, the orientation angles (A1-A3) relative to the standard thriedron of equatorial coordinates, and
the equatorial biases (A4N and A4S, north and south of -20![]() |
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