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Table 1
Characteristics of the catalogs.
| No. sources | |||||
|
|
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| Total | ICRF2 | Defining | Mean declination | ||
|
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|||||
| ICRF2 | 3414 | 3414 | 295 | 9.5° | |
| aus2013a | 2949 | 2912 | 291 | 11.3° | |
| bkg2013a | 3294 | 3097 | 287 | 11.9° | |
| gsf2012a | 3708 | 3413 | 295 | 8.4° | |
| iaa2012a | 2943 | 2796 | 292 | 8.7° | |
| opa2013a | 3580 | 3375 | 295 | 9.3° | |
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