Equinox Systems GEMINI Manuel d'utilisateur Page 70
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Gemini Users Manual 65
5.3.10.2.1 Tracking Speed
This menu item allows you to set the speed and method used to track objects in the sky.
You can select any of the following tracking speeds:
• Sidereal
• Lunar
• Solar
• Adaptive King
• None/Terrestrial
• Closed Loop
• Comet Tracking
Enter RA Rate
Enter DEC Rate
Train Tracking
Calculate Rates
{Activate}
"Sidereal" speed causes the telescope to track in right ascension (RA) at the rate of the
Earth's rotation. It is therefore an accurate tracking rate for stars and other deep space
objects.
"Lunar" speed causes the telescope to track the right ascension component of the lunar
trajectory. Since the Moon has a non-circular orbit and moves in both RA and Dec.
relative to Earth, "Lunar" tracking speed is calculated for the apparent movement of the
Moon within the next hour. Especially if the Moon is near the horizon, reselecting Lunar
tracking speed a while later will result in a slightly different tracking speed because
refraction and parallax play a large role.
"Solar" speed is very close to sidereal speed, but slightly more accurate for observing the
Sun. It is, however, so close, that visual observers of the Sun can usually use sidereal
speed without difficulty. As with “Lunar” tracking, “Solar” speed takes into account the
changes caused by the elliptic orbit of the Earth, and adapts the tracking rate accordingly.
"Adaptive King" speed is an enhancement of the fixed King Rate. Its purpose is to take
refraction into account when observing near the horizon, thereby adapting the tracking
rate for the apparent change in an object's position. See Chapter 3, section 3.3.1.2 of this
manual for a more complete explanation.
"None/Terrestrial" stops all telescope tracking. It can be used for terrestrial observing, or
when it is desirable to stop the telescope from moving without powering Gemini off.
"Closed Loop" tracking is a tool for keeping an object centered in the field of view (1)
when the mount is not accurately polar aligned or (2) when an object moves slowly with
respect to the background sky, and its coordinates are downloaded cyclically. Gemini
accomplishes this by comparing the apparent modeled coordinates of the object being
tracked with the actual coordinates of the telescope, and makes slow RA and Dec.
- Users Manual 1
- Table of Contents 2
- 1 Introduction 6
- 1.2 Features 7
- 1.3 What’s New in Level 4? 10
- 2 Getting Started 13
- 2.2 Installation 14
- 2.2.3 Encoders 15
- 2.2.4 Power Requirements 16
- 2.3.1 Controls 16
- 2.3.3 QuickMenu 18
- 2.4 Basics of Operation 19
- 2.4.1.2 Startup Position 20
- 2.4.2 Power On and Setup 20
- 2.4.2.2 Completing Startup 23
- 2.4.2.3 Preferences 23
- 2.4.4 Normal Operation 27
- 2.5 Next Steps 28
- 3.1.2 Precession 30
- 3.2 How the Sky Moves 31
- 3.3 Tracking 31
- 3.3.1.1 Predefined Rates 32
- Training Comet Tracking 35
- Timer Values 35
- PC Controlled Tracking 36
- 3.3.2 Meridian Flip 37
- 3.3.3 RA Safety Limits 37
- 3.4 Polar Alignment 39
- 3.4.3 Accuracy Required 41
- 3.5 Mount Modeling 42
- 3.5.3 Modeling Parameters 44
- 4.2 Guiding 45
- 4.2.2 Manual Guiding 46
- 4.2.5 Software Guiding 47
- 4.3.2 The PEC Submenu 49
- 4.3.2.1 Train PEC 49
- 4.3.2.2 Clear Data 50
- 4.3.2.3 Turn PEC On/Off 50
- 4.3.2.4 Delay Correction 50
- 4.3.2.5 Drift Correction 51
- 4.3.2.6 Smooth Data 52
- 4.3.2.7 Average Data 52
- 4.4 Other Functions 53
- 5.1 Startup Mode Menu 54
- 5.2 The Main Menu 55
- 5.3 Subordinate Menu System 56
- 5.3.1.2 {Reset Alignment} 57
- 5.3.1.3 {Additional Align} 57
- 5.3.1.4 Synchronize 58
- 5.3.1.5 {Polar Al. Assist} 58
- 5.3.1.6 {Polar Axis Corr.} 58
- 5.3.2 Object Database 59
- 5.3.2.1 Database Use 59
- 5.3.2.2 Accuracy and Epochs 60
- 5.3.2.3 Credits 60
- 5.3.2.6 IC (Index Catalog) 61
- 5.3.6.1 RA/DEC Display 64
- 5.3.6.2 Enter RA/DEC 64
- 5.3.6.3 Az/El Display 64
- 5.3.6.4 Enter Az/El 65
- 5.3.6.5 Set Bookmark 65
- 5.3.6.6 {GoTo Bookmark #n} 65
- 5.3.7 Identify 65
- 5.3.8 Object Search 66
- 5.3.8.2 Wobble Object 67
- 5.3.9 Show Date/Time 67
- 5.3.9.2 Julian Date 67
- 5.3.10 Setup 68
- 5.3.10.1 Hand Controller 69
- 5.3.10.2 Mount Parameters 69
- 5.3.10.2.1 Tracking Speed 70
- 5.3.10.2.2 Moving Speeds 71
- 5.3.10.2.5 Mount Type 72
- 5.3.10.2.8 {Pointing Model} 75
- 5.3.10.3 Encoder 76
- 5.3.10.4 Alarm/Buzzer 76
- 5.3.10.5 UTC Date/Time 77
- 5.3.10.6 Credit Info 77
- 5.3.10.7 Restore Defaults 78
- 5.3.10.8 Dim Display 78
- 5.3.10.9 Geogr. Location 78
- 5.3.10.9.5 Store Site 79
- 5.3.10.9.6 Load Site 79
- 5.3.10.10 Communication 80
- 5.3.10.10.2 Sync or Align 80
- 5.4 QuickMenu 81
- 5.4.1 Focusing 82
- 5.4.4 Centering 82
- 5.4.5 Park Mount! 83
- 5.4.6 Meridian Flip 83
- 5.4.7 Exit w/o Change 83
- 6 Serial Communication 85
- 6.2 Hand Controller port 87
- 6.3 Serial Command Sets 88
- 6.5.1 Telescope Driver 90
- 6.5.3 Coordinate Epoch 90
- 6.6 Using Control Programs 91
- 7 Troubleshooting 92
- 7.2 Debug Mode 96
- 8 Appendices 97
- QuickMenu 101
- Cold Start Setup Menu 101
- *Reduced Menu 101
- 8.2 Catalogs 102
- 8.3 Alignment Star List 103
- 8.4 Serial Line Protocol 105
- • Right Ascension 112
- • Declination {+ 112
- • the object name (up to 10 112
- Gemini Native Commands 116
- 8.5 Serial Communications 129
- 8.6 Autoguider Port 130
- 8.7 Encoder Port 132
- Connecting End Switches 133
- 8.8 Feature Port 134
- 8.9 Motor Connector Pinouts 135
- RJ-45 Connector 135
- DIN Connector 135
- 8.10 Power Connector Pinout 136
- Power Connector 136
- 8.11 Upgrading the EPROM 137
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