Central Wavelength or Range if Grating or Prism Used [Wavelength]

Cycle 19 Phase II Proposal Instructions

HST Phase II Proposal Instructions for Cycle 19 > Chapter 5: Visits, Exposures and Exposure Groups > 5.12 Central Wavelength or Range if Grating or Prism Used [Wavelength]

5.12 Central Wavelength or Range if Grating or Prism Used [Wavelength]

If a linear ramp filter, quadrant filter, grating, or prism is to be used, the central wavelength should be entered. NICMOS exposures do not require a central wavelength or range.

Wavelengths should be expressed in Å in the observed frame (but the units should be omitted). Use vacuum wavelengths below 2000 Å, and air wavelengths above 2000 Å.

For STIS and COS exposures, the central wavelength must obey one of the legal spectral element/wavelength combinations given in Table 9.2: Supported Central Wavelengths for STIS Gratings and Table 13.3: COS Spectral Elements and Central Wavelengths.