1. STScI
2. HST
3. Two Gyro Mode Handbook

	HST Two-Gyro Handbook

Table of Contents

Acknowledgments

Chapter 1: Introduction to Two Gyro-Mode

1.1 Introduction

1.2 Two-Gyro Pointing Jitter and Image Quality

1.3 Guide Star Acquisitions

1.4 Scheduling and Target Visibility

1.5 Science Instrument Performance

Chapter 2: Planning Observations in Two-Gyro Mode

2.1 All-Sky Availability of Fixed Targets

2.1.1 Overview

2.1.2 All-sky Availability Movie

2.1.3 Number of Available Days During the Course of a Year

2.2 Scheduling Considerations and Visibility Periods for Fixed Targets

2.2.1 Overview

2.2.2 Unconstrained Fixed-Target Observations

2.2.3 Constrained Fixed-Target Observations

2.2.4 Examples

2.3 Verifying Scheduling Constraints for Phase I

2.4 Two-Gyro Orbit Calculations for Phase I

2.5 Continuous Viewing Zones

2.6 Moving Targets