COS Instrument Handbook for Cycle 26 |

help@stsci.edu |

Cosmic Origins SpectrographInstrument Handbook for Cycle 26 > Chapter 1: An Introduction to COS > 1.3 COS Quick Reference Guide

Table 1.1: COS Instrument Characteristics

Table 1.2: COS Detector Characteristics

Cs2Te (semi-transparent) MgF2 (re-entrant) 85 × 10 mm (two) 25.6 × 25.6 mm 16,384 × 1024 (two) 1024 × 1024 1024 × 1024 6 × 10 pix 3 × 3 pix 7.4 μs The dark rate varies with time. The reported values are measured as of December 2017. FUVA and FUVB values differ slightly (see Table 7.1).Count rates higher than these limits will trigger a detector shut-down. Bright-object screening limits are lower. See Chapter 10.

Table 1.3: COS Calibration Accuracies

15 km s–1 15 km s–1 150 km s–1 175 km s–1 15 km s–1 15 km s–1 With updated dispersion solutions, the wavelength scales for the FUV M gratings are now accurate to 7 km s–1. See the COS website for more details.

Table 1.4: Useful Figures and Tables

HST focal plane and COS aperture

Cosmic Origins SpectrographInstrument Handbook for Cycle 26 > Chapter 1: An Introduction to COS > 1.3 COS Quick Reference Guide