Table 9.
Number of ICRF3 defining sources at each frequency band and statistics about coordinate uncertainties, correlation coefficients between right ascension and declination, and the error ellipse size (semi-major axis) for these sources.
Statistics for all defining sources |
Statistics for the common defining sources |
||||||||
---|---|---|---|---|---|---|---|---|---|
Frequency | Number of | Coordinate uncertainty | Correlation | Error ellipse | Coordinate uncertainty | Correlation | Error ellipse | ||
band | sources | α cos δ | δ | coeff. | (μas) | α cos δ | δ | coeff. | (μas) |
(μas) | (μas) | (μas) | (μas) | ||||||
S/X | 303 | 36 | 41 | 0.07 | 41 | 33 | 35 | 0.06 | 35 |
K | 193 | 63 | 120 | 0.28 | 122 | 60 | 113 | 0.27 | 115 |
X/Ka | 176 | 62 | 92 | 0.40 | 98 | 62 | 92 | 0.40 | 97 |
Notes. Statistics are provided for all defining sources in each catalog and for the 171 defining sources common to the three catalogs. All values reported in columns 3–10 are median values.
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