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STIS Spectroscopic Capabilities

Grating/ Prism Spectral Range (Å) Dispersion
(Å/pix)		 Resolution Detector Plate Scale
("/pix)
Full Per Tilt Spatial Spectral
First Order Gratings
G140L 1150-1736 610 0.6 935-1440 FUV-MAMA 0.024  
G140M 1150-1740 55 0.05 11500-17400 0.029 0.036
G230L 1570-3180 1610 1.58 500-1005 NUV-MAMA 0.024  
G230M 1640-3175 90 0.09 9110-17500 0.029 0.035
G230LB 1685-3065 1380 1.35 615-1135 CCD 0.051  
G230MB 2000-3100 155 0.15 5550-10335 0.051  
G430L 2900-5700 2900 2.73 530-1040 0.051  
G430M 3025-5615 286 0.28 5330-10270 0.051  
G750L 5240-11490 5030 4.92 535-1170 0.051  
G750M 5450-11150 570 0.56 4870-9950 0.051  
Echelle Gratings
E140M 1150-1700 600 l/91,700 45,800 FUV-MAMA    
E140H 1150-1700 210 l/228,000 114,000 0.029 0.047
E230M 1575-3110 800 l/60,000 30,000 NUV-MAMA    
E230H 1650-3000 267 l/228,000 114,000 0.029 0.047
Prism
PRISM 1150-3000 1950 1.2-20 1000-26 NUV-MAMA    

To simplify instrument operation and calibration, only specific grating tilts with corresponding central wavelengths are implemented. There are also a few unsupported or unavailable central wavelengths.

Approximate wavelength solutions for the prism settings at 1200 and 2125 Å are available.

Issues to consider when choosing between G230LB and G230L or choosing between G230MB and G230M include relative sensitivity, read noise, plate scale, bright object limits, and detector PSF.

G750L and G750M are subject to long wavelength fringing for wavelengths > 7500 Å.

Spectral format plots for each combination of detector, optical element and central wavelength are available.

Only a portion of the full spectral range falls on the detector for the intermediate-resolution first-order and the echelle (except E140M) gratings. Therefore separate exposures must be taken for these gratings for full wavelength coverage.

STIS Shortcuts

Exposure Time Calculators
Instrument Handbook
Data Handbook
Call for Proposals
HST Primer
Phase II Instructions
ISRs
STIS Timeline

Program Status

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