Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 17

0.2X0.05ND Aperture

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Description

Supported neutral-density-filtered slit for use with bright objects with the echelle gratings. The dex ND factor is 2.0.

Special Considerations

Observations with this slit require a prior PEAKUP. This aperture can also be used with the CCD for ACQ/PEAKs.

Table 13.31: 0.2X0.05ND Throughputs

	% Throughput
1150	0.13
1350	0.40
1550	0.49
1750	0.46
1950	0.39
2150	0.41
2350	0.48
2550	0.56
2750	0.61
2950	0.63
3150	0.60

Aperture	Projected Length (arcsec) (MAMA E-modes)	Width (arcsec)
0.2X0.05ND	0.2	0.05

Figure 13.80: 0.2X0.05ND Aperture Throughput as a Function of Wavelength