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Resolution and Wavelength Coverage
Resolutions and wavelength coverage (with the long camera)
40 l/mm grating1:
| order |
resolving power |
coverage (um) |
| 2 (0.95 - 1.40 um) |
800 x lambda |
0.32 |
| 1 (1.30 - 5.50 um) |
400 x lambda |
0.64 |
150 l/mm grating1:
| order |
resolving power |
coverage (um) |
| 3 (1.07 - 1.30 um) |
4700 x lambda |
0.055 |
| 2 (1.25 - 2.50 um) |
3100 x lambda |
0.08 |
| 1 (2.10 - 5.50 um) |
1550 x lambda |
0.16 |
Echelle1,2:
- Resolving power is 37000 at the optimum order.
- Coverage is 0.006 x lambda.
1: These are the resolving powers for the 1-pixel wide slit (0.609"). Half the values
when using the 2-pixel wide slit. They will be x4 lower when using the
4-pixel wide slit for extended object, but probably only x2 lower for guided
point sources.
2: There is no 4-pixel wide slit available for use with the echelle.
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