Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 17

52X0.05 Aperture

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Description

This slit is supported with use of the first-order gratings and prism and provides the best spatial and spectral resolution of the long slits. This aperture is the 2 pixel wide slit in the dispersion direction for the MAMA first-order modes.

Special Considerations

Observations with this slit require a PEAKUP prior to science observations. The actual width of this aperture is 34 milliarcsec instead of 50 milliarcsec, the value suggested by its name. Special pseudo-apertures have been defined to minimize detector effects such as background and CTE. See next page for more information.

Table 13.18: 52X0.05 Throughputs

	% Throughput
1200	20.83
1600	41.0
2000	46.4
2400	49.4
2800	50.6
3200	50.5
3600	49.6
4000	48.3
4400	46.9
4800	45.2
5200	43.5
5600	41.7
6000	40.0
6400	38.3
6800	36.8
7200	35.3
7600	33.9
8000	32.8
8400	31.7

	Projected Length (arcsec)
Aperture	CCD	MAMA (M-modes)	MAMA (L-modes)	Width (arcsec)
52X0.05	52.0	28.0	25.0	0.034

Figure 13.65: 52X0.05 Aperture Throughput as a Function of Wavelength.