Table 2
Summary of the comparison between the TGAS parallaxes and the external catalogues.
| Catalogue | Outliers | ϖ difference | ϖ extra dispersion |
|
|
|||
| Hipparcos | 0.09% | −0.094 ± 0.004 | 0.580 ± 0.005 |
|
|
|||
| VLBI | 0/9 | 0.083 ± 0.12 | – |
| HST | 2/19 | −0.11 ± 0.19 | 0.6 ± 0.2 |
| RECONS | 0/13 | −1.04 ± 0.58 | −0.9 ± 0.5 |
| VLBI & HST & RECONS | 2/41 | −0.08 ± 0.12 | 0.42 ± 0.13 |
|
|
|||
| Cepheids | 0/207 | −0.014 ± 0.014 | −0.18 ± 0.01 |
| RRLyrae | 0/130 | −0.07 ± 0.02 | −0.16 ± 0.02 |
| Cepheids & RRLyrae | 0/337 | −0.034 ± 0.012 | −0.17 ± 0.01 |
|
|
|||
| RAVE | 47/5144 | 0.070 ± 0.005 | −0.06 ± 0.02 |
| APOGEE | 0/2505 | −0.060 ± 0.006 | −0.12 ± 0.01 |
| LAMOST | 6/317 | −0.01 ± 0.02 | −0.17 ± 0.02 |
| PASTEL | 1/218 | 0.05 ± 0.02 | 0.10 ± 0.05 |
| APOKASC | 0/969 | −0.070 ± 0.009 | −0.15 ± 0.01 |
|
|
|||
| LMC | 2/142 | 0.11 ± 0.02 | −0.14 ± 0.03 |
| SMC | 0/58 | −0.12 ± 0.05 | −0.09 ± 0.09 |
|
|
|||
| ICRF2 QSO auxiliary solution | 1/2060 | −0.046 ± 0.010 | −0.17 ± 0.01 |
Notes. The number of outliers (at 5σ) vs. the total number of stars is presented. The parallax difference (ϖG−ϖE, in mas) and the extra uncertainty (in mas) that needs to be quadratically added or subtracted to the data to adjust the residuals are indicated in red when they are significant and in green when they are not (p-value limit: 0.01). A global estimate of the parallax offset as given by the weighted average of these various tests is −0.036 ± 0.002 mas, very similar to the estimate found using quasars, and the median of the extra dispersion is −0.14 ± 0.08 mas.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.