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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.

Contact: Tom Kerr. Updated: Tue Jan 25 11:08:56 HST 2005

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