Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 17

0.3X0.05ND 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 3.0.

Special Considerations

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

Table 13.32: 0.3X0.05ND Throughputs

	% Throughput
1150	0.017
1350	0.042
1550	0.044
1750	0.038
1950	0.032
2150	0.035
2350	0.044
2550	0.057
2750	0.067
2950	0.072
3150	0.064

Aperture	Projected Length (arcsec) (MAMA E-modes)	Width (arcsec)
0.3X0.05ND	0.3	0.05

Figure 13.81: 0.3X0.05ND Aperture Throughput as a Function of Wavelength