Space Telescope Imaging Spectrograph Instrument Handbook for Cycle 14

52X2 Aperture

---

Description

The last in the series of supported long slits used with the first-order gratings and prism and is a good slit for spectrophotometric observations of point sources. The small dip seen at 2000Å is likely due to uncertainties in the numerical calculation, and will not affect the absolute flux calibration.

Special Consideration

Observations using this slit do not need to be preceded by a PEAKUP. Be aware of effects of OTA scatter on the line profiles when observing point sources in the wide slits (see Section 13.7). Targets not centered on the slit along the spatial direction can experience significant shifts in wavelength.

Table 13.22: 52X2 Throughputs.

	% Throughput
1200	96.6
1800	98.1
2400	98.5
3000	98.7
3600	98.7
4200	98.8
4800	98.8
5400	98.8
6000	98.8
6600	98.8
7200	98.8
7800	98.8
8400	98.9

  

	Projected Length (arcsec)
Aperture	CCD	MAMA (M-modes)	MAMA (L-modes)	Width (arcsec)
52X2	52.0	28.0	25.0	2.0

Figure 13.69: 52X2 Aperture Throughput as a Function of Wavelength


 

	Space Telescope Science Institute http://www.stsci.edu Voice: (410) 338-1082 help@stsci.edu