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Table 6.
Main geometric properties of the Metis mirrors.
| Mirror | Shape of the surface | Nominal |
Measured |
Clear aperture (Diameter, mm) | ||
|---|---|---|---|---|---|---|
| R (mm) | k | R (mm) | k | |||
| M1 | Concave ellipsoid with a central hole | 272.000 | −0.662 | 272.003 | −0.662 | Annular from 88 to 160 |
| M2 | Concave ellipsoid with a central hole | 312.385 | −0.216 | 312.388 | −0.216 | Annular from 131 to 216 |
| M0 | Concave spherical | 1600 | 0 | 1596.34 | 0 | 71 |
Notes. R is the curvature radius and k is the conic constant.
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