Image quality for a point source is characterized in terms of encircled energy/intensity vs. radius.
| Detector | Filter | |||
|---|---|---|---|---|
| CCD | Clear | Long Pass | OIII | OII |
| NUV-MAMA | Clear CIII |
Quartz CN182 |
MgII | CN270 |
| FUV-MAMA | Clear | Quartz | SrF2 | LyA |
| Detector | Filter | |||
|---|---|---|---|---|
| CCD | Clear | Long Pass | OIII | OII |
| NUV-MAMA | Clear CIII |
Quartz CN182 |
MgII | CN270 |
| FUV-MAMA | Clear | Quartz | SrF2 | LyA |
| Detector | Filter | |||
|---|---|---|---|---|
| CCD | Clear | Long Pass | OIII | OII |
| NUV-MAMA | Clear CIII |
Quartz CN182 |
MgII | CN270 |
| FUV-MAMA | Clear | Quartz | SrF2 | LyA |
Spectroscopic image quality for point sources is characterized in terms of encircled energy or spatial profiles.
| Encircled Energy Tables | Spatial Profile Plots |
| G140L, G140M, G230L, G230M | G140L, G140M, G230L, G230M |
| G230LB, G230MB | G230LB, G230MB |
| G430L, G430M, G750L, G750M | G430L, G430M, G750L, G750M |
| E140M, E230M | E140M, E230M |
| E140H, E230H | E140H, E230H |
Coronagraphic imaging with STIS reduces PSF wings by an order of magnitude several arcsec from the source.
The NUV-MAMA detector PSF has broader wings than the FUV-MAMA PSF because the NUV photocathode coating is on the dewar window instead of directly on the microchannel plate surface.
A new geometric-distortion solution for the NUV-MAMA has been obtained and a new geometric distortion table is in full use by the OTFR system.
First-order spectra of point sources contain weak satellite spectra of PSF Airy rings. Separation increases with wavelength.