Gemini Users Manual ii
3.3 Tracking ........................................................................................................ 26
3.3.1 Rates...................................................................................................... 26
3.3.2 Meridian Flip ........................................................................................ 32
3.3.3 RA Safety Limits .................................................................................. 32
3.3.4 GoTo Commands and Meridian Flips................................................... 33
3.4 Polar Alignment............................................................................................ 34
3.4.1 Definition .............................................................................................. 34
3.4.2 Techniques ............................................................................................ 34
3.4.3 Accuracy Required................................................................................ 36
3.5 Mount Modeling ........................................................................................... 37
3.5.1 Definition .............................................................................................. 37
3.5.2 System Startup Modes .......................................................................... 37
3.5.3 Modeling Parameters ............................................................................ 39
4 Considerations for Imaging ................................................................................... 40
4.1 Accuracy of Polar Alignment ....................................................................... 40
4.2 Guiding ......................................................................................................... 40
4.2.1 The Autoguider Port ............................................................................. 40
4.2.2 Manual Guiding .................................................................................... 41
4.2.3 Connecting an Autoguider to an Older Gemini .................................... 41
4.2.4 Connecting an Autoguider to a Newer Gemini..................................... 42
4.2.5 Software Guiding.................................................................................. 42
4.3 Periodic Error Control (PEC)........................................................................ 43
4.3.1 What is Periodic Error?......................................................................... 43
4.3.2 The PEC Submenu................................................................................ 44
4.4 Other Functions............................................................................................. 48
5 Gemini Command Menu Reference...................................................................... 49
5.1 Startup Mode Menu ...................................................................................... 49
5.1.1 Cold Start .............................................................................................. 49
5.1.2 Warm Start & Warm Restart................................................................. 50
5.2 The Main Menu............................................................................................. 50
5.2.1 Full Main Menu .................................................................................... 50
5.2.2 Reduced Main Menu............................................................................. 50
5.3 Subordinate Menu System ............................................................................ 51
5.3.1 Align Telescope .................................................................................... 51
5.3.2 Object Database .................................................................................... 54
5.3.3 Show Information ................................................................................. 58
5.3.4 {GoTo <object>} .................................................................................. 58
5.3.5 {Guide <object>}............................................................................. 58
5.3.6 Coordinates ........................................................................................... 58
5.3.7 Identify.................................................................................................. 60
5.3.8 Object Search........................................................................................ 61
5.3.9 Show Date/Time ................................................................................... 62
5.3.10 Setup ..................................................................................................... 63
5.4 QuickMenu ................................................................................................... 76
5.4.1 Focusing................................................................................................ 77
5.4.2 Set Photo/Visual Modes........................................................................ 77
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