Table 5
Euclid image quality performance (VIS channel).
| Variable | STOP | In-orbit | Required |
|---|---|---|---|
| FWHM ["’] | 0.146 | 0.141±0.006a | 0.155 |
| Ellipticity |e| | 0.074 | 0.024 (0.05)b | 0.14 |
| R2 [arcsec2] | 0.053 | 0.048 (0.050)b | 0.055 |
| δϵ | 1.5 × 10−3 | − | 2 × 10−3 |
| δR2/R2 | 1.5 × 10−3 | − | 2 × 10−3 |
Notes. The STOP performance values were calculated before launch; they are worst cases and do not belong to the same realisation. The in-orbit ellipticity and FWHM values were derived from a VIS frame taken from the early release observations (ERO) programme; the in-orbit R2 were measured from VIS frames during telescope alignment. (a)uncertainty range is based on the minimum and maximum measured values in the field. (b)average value, the maximum value in the field is given between parentheses.
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