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Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 22 > Chapter 14: ImagingReference Material > F25SRF2D1—FUV-MAMA, Longpass Pseudo-Aperture

F25SRF2D1—FUV-MAMA, Longpass Pseudo-Aperture
Description
This is the same physical aperture as the F25SRF2 aperture and has become available for use with the FUV-MAMA detector to minimize the contribution from the dark current when observing very faint targets. This aperture moves the target 2 arcseconds above the bottom edge of the FUV-MAMA. It is yet to be determined if the throughput for a target at this position is significantly different from that obtained at the standard position.
Special Considerations
Usage of this slit is only allowed with the G140L and G140M gratings. For more information on throughputs, encircled energy, etc., please refer to the information for “F25SRF2—FUV-MAMA, Longpass”.

Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 22 > Chapter 14: ImagingReference Material > F25SRF2D1—FUV-MAMA, Longpass Pseudo-Aperture

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