Table 1
Optimal characteristics of the spatio-spectral encoding of the VEGA-3T/4T modes in medium spectral resolution.
| MODE | N ch | lc(mm) | OPD offsets (μm) |
|
|
|||
| 3T | 200 | ±1.8 | 0 -100 +150 |
| 4T | 200 | ±1.8 | 0 -100 +150 +250 |
Notes. The last column indicates the typical OPD offsets for pupils 1-2-3 or 1-2-3-4. The actual implementation could be different, thanks to the residual cophasing errors between VEGA and the infrared instruments.
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