Open Access
Table 1
Summary of EST future capabilities based on the technical requirements presented in Sect. 4.
| Telescope | On axis Gregorian telescope |
| Aperture | 4.2 m with a central obscuration of 1.1 m |
| Secondary mirror | ASM with 5 degrees of freedom (piston, δx, δy, and tip-tilt) |
| Mount | Altitude-azimuth mount |
| FOV | 125″ diameter |
| AO | MCAO |
| Spatial resolution | Diffraction limited at 0.025″ at 500 nm |
| Polarimetric accuracy | 5 × 10−4 of Ic |
| Polarimetric sensitivity | 3 × 10−5 of Ic |
| Spectral range | 380-2300 nm |
| Observations | Multi-wavelength simultaneous observations |
| Coudé lab | Non-rotating platform |
| Instruments | 1. Integral Field Spectropolarimeters, |
| 2. Tunable Imaging Spectropolarimeters, | |
| 3. Fixed Band Imagers | |
| Polarimeters | Polarimeter(s) in the blue, visible, red and near-infrared |
| Lifetime | At least two Hale solar cycles, i.e. 44 yr |
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