COS Instrument Handbook for Cycle 24

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Chapter 8:
Target Acquisitions

8.1 Introduction

8.2 Target Acquisition Overview

8.3 ACQ/SEARCH Acquisition Mode

8.4 ACQ/IMAGE Acquisition Mode

8.5 ACQ/PEAKXD Acquisition Mode

8.5.1 Description

8.5.2 Effects of FUV Detector Y Walk

8.6 ACQ/PEAKD Acquisition Mode

8.7 Exposure Times

8.7.1 Imaging Acquisitions

8.7.2 Dispersed-Light Acquisitions

8.8 Centering Accuracy and Data Quality

8.8.1 Centering Accuracy and Wavelength Accuracy

8.8.2 Centering Accuracy and Photometric Precision

8.8.3 Centering Accuracy and Spectroscopic Resolution

8.9 Recommended Parameters for all COS TA Modes

8.10 Special Cases

8.10.1 Early Acquisitions and Preliminary Images

8.10.2 Extended or Multiple Targets

8.10.3 Offset Target Acquisitions

8.10.4 Acquisition Failure Actions and Diagnostics