Table 3
Basic performance statistics for Gaia DR2.
| Data product or source type | Typical uncertainty |
|---|---|
| Five-parameter astrometry (position & parallax) | 0.02–0.04 mas at G < 15 |
| 0.1 mas at G = 17 | |
| 0.7 mas at G = 20 | |
| 2 mas at G = 21 | |
| Five-parameter astrometry (proper motion) | 0.07 mas yr−1 at G < 15 |
| 0.2 mas yr−1 at G = 17 | |
| 1.2 mas yr−1 at G = 20 | |
| 3 mas yr−1 at G = 21 | |
| Two-parameter astrometry (position only) | 1–4 mas |
| Systematic astrometric errors (averaged over the sky) | <0.1 mas |
| Gaia-CRF2 alignment with ICRF | 0.02 mas at G = 19 |
| Gaia-CRF2 rotation with respect to ICRF | <0.02 mas yr−1 at G = 19 |
| Gaia-CRF2 alignment with ICRF | 0.3 mas at G < 12 |
| Gaia-CRF2 rotation with respect to ICRF | <0.15 mas yr−1 at G < 12 |
| Mean G-band photometry | 0.3 mmag at G < 13 |
| 2 mmag at G = 17 | |
| 10 mmag at G = 20 | |
| Mean GBP- and GRP-band photometry | 2 mmag at G < 13 |
| 10 mmag at G = 17 | |
| 200 mmag at G = 20 | |
| Median radial velocity over 22 months | 0.3 km s−1 at GRVS < 8 |
| 0.6 km s−1 at GRVS = 10 | |
| 1.8 km s−1 at GRVS = 11.75 | |
| Systematic radial velocity errors | <0.1 km s−1 at GRVS < 9 |
| 0.5 km s−1 at GRVS = 11.75 | |
| Effective temperature Teff | 324 K |
| Extinction AG | 0.46 mag |
| Colour excess E(GBP − GRP) | 0.23 mag |
| Radius | 10% |
| Luminosity | 15% |
| Solar system object epoch astrometry | 1 mas (in scan direction) |
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.