Table 1
Summary of the comparison between the Gaia parallaxes and the external catalogues.
| Catalogue | Nb | Outliers | ⟨G⟩ | ϖ difference | ϖcor difference | ϖcor uwu | |
|---|---|---|---|---|---|---|---|
| HIPPARCOS | 62484 | 0.15% | 8.2 | −0.089 ± 0.003 | −0.068 ± 0.002 | 2.4 ± 0.4 | |
| VLBI | 40 | 8% | 8.3 | −0.01 ± 0.01 | 0.02 ± 0.01 | 2.0 ± 0.4 | |
| HST | 49 | 27% | 12.2 | 0.01 ± 0.02 | 0.03 ± 0.02 | 1.9 ± 0.3 | |
| RECONS | 427 | 3% | 12.6 | −0.8 ± 0.06 | −0.8 ± 0.06 | 1.54 ± 0.06 | |
| Gaia Cepheids | 1372 | 1% | 15.7 | −0.028 ± 0.0007 | 0.006 ± 0.0007 | 1.22 ± 0.02 | |
| Gaia RRLyrae | 318 | 2% | 18.1 | −0.030 ± 0.008 | −0.001 ± 0.008 | 1.04 ± 0.05 | |
| APOGEE | 3453 | 2% | 18.6 | −0.046 ± 0.003 | −0.007 ± 0.003 | 1.19±0.02 | |
| SEGUE Kg | 2491 | 0.04% | 17.3 | −0.029 ± 0.002 | 0.004 ± 0.001 | 1.07±0.02 | |
| LMC | 52795 | 0.7% | 19.2 | −0.023 ± 0.0003 | 0.003 ± 0.0003 | 1.3 ± 0.004 | |
| LMC Vr | 318 | 1.6% | 12.8 | −0.004 ± 0.001 | 0.015 ± 0.001 | 2.17 ± 0.09 | |
| SMC | 26480 | 1.3% | 16.4 | −0.0255 ± 0.0002 | 0.0055 ± 0.0002 | 1.26 ± 0.006 | |
| SMC Vr | 114 | 9.6% | 12.5 | −0.006 ± 0.001 | 0.016 ± 0.001 | 1.5 ± 0.1 | |
| Draco | 427 | 0% | 19.3 | −0.024 ± 0.005 | 0.0002 ± 0.006 | 1.09 ± 0.04 | |
| Sculptor | 1286 | 0.08% | 19.1 | −0.011 ± 0.005 | 0.015 ± 0.004 | 1.09 ± 0.03 | |
| Sextans | 528 | 0% | 19.4 | −0.015 ± 0.01 | 0.01 ± 0.01 | 1.00 ± 0.03 | |
| Carina | 865 | 0% | 19.8 | −0.014 ± 0.005 | 0.012 ± 0.005 | 1.03 ± 0.02 | |
| Antlia II | 159 | 0% | 18.9 | −0.025 ± 0.012 | −0.0006 ± 0.01 | 0.89 ± 0.05 | |
| Fornax | 2660 | 0.6% | 18.8 | −0.013 ± 0.003 | 0.011 ± 0.003 | 1.16 ± 0.03 | |
| LeoII | 185 | 0% | 19.8 | 0.005 ± 0.03 | 0.02 ± 0.03 | 1.0 ± 0.05 | |
| LeoI | 328 | 0.3% | 19.6 | −0.063 ± 0.02 | −0.05 ± 0.02 | 1.11 ± 0.04 | |
| all dSph | 7174 | 0.3% | 19.0 | −0.017 ± 0.002 | 0.008 ± 0.002 | 1.09 ± 0.01 | |
| ICRF3 | 3172 | 0.06% | 18.9 | −0.023 ± 0.002 | 0.001 ± 0.002 | 1.10 ± 0.01 | |
| LQRF | 8231 | 0.03% | 19.1 | −0.024 ± 0.0006 | −0.0015 ± 0.0006 | 1.063 ± 0.003 | |
| RFC2016cnoU | 3705 | 0.05% | 18.9 | −0.022 ± 0.002 | 0.002 ± 0.002 | 1.090 ± 0.01 |
Notes. We present the total number of stars used in the comparison (Nb) as well as the percentage of outliers excluded (at 5σ, in violet if higher than 10%) as well as the median G of the sample. The parallax differences (ϖG − ϖE, in mas), the parallax difference with the correction of Lindegren et al. (2021a) applied (ϖcor) and the unit-weight uncertainty (uwu) that needs to be applied to the uncertainties to adjust the differences are indicated in violet when they are significant (p-value limit: 0.01) and higher than 10 μas for the parallax difference and 10% for the uwu. For the HIPPARCOS catalogue, in addition to the uwu, a systematic uncertainty of 0.5 mas has yet to be quadratically added.
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