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iOptron GEM28 User Manual

iOptron GEM28
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5.6.3. PEC Data Integrity
This function will check the recorded PEC data integrity.
5.7. Edit User Objects
Besides various star lists available in the hand controller, you can add, edit or delete your own user-
defined objects. This is especially useful for newly found comets. You can also add your favorite
observation object into the user object list for easy sky surfing. Up to 60 comets and other user objects can
be stored.
5.7.1. Enter a New Comet
Press MENU => Edit User Objects to set user objects.
Select User Defined Comet to add/browse/delete the user-defined comet list. Find the orbit
parameters of a comet in the SkyMap format. For example, the C/2012 ISON has an orbit parameter:
No.
Name
Year
M
Day
q
e
ω
Ω
I
H
G
C/2012
S1 ISON
2013
11
28.7960
0.0125050
1.0000030
345.5088
295.7379
61.8570
6.0
4.0
Select Add a New Comet to add a new one:
The hand controller will display the parameter entry screen:
Enter the parameters using the arrow buttons and number keys. Press ENTER and a confirmation
screen will be displayed. Press ENTER again to store the object under the assigned user object number, or
press BACK button to cancel.
5.7.2. Enter Other Objects or Observation List
Press MENU => Edit User Objects to set user objects.
Select “Other Objects” to enter you own object:
User Defined Comet
Other Objects
Date: 2000-01-00.0000
q: 0.000000 e: 0.000000
ω: 000.0000 Ω: 000.0000
i: 000.0000
Add a New Comet
Browse Comets
Delete a Comet
Clear All Comets
User Defined Comet
Other Objects

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iOptron GEM28 Specifications

General IconGeneral
Payload Capacity28 lbs (12.7 kg)
Mount Weight10.4 lbs (4.7 kg)
RA Worm Gear MaterialBrass
DEC Worm Gear MaterialBrass
Tracking RateSidereal, Lunar, Solar
Autoguiding PortYes
Communication PortUSB
Tracking Accuracy± 5 arcsec
Weight10.4 lbs (4.7 kg)
Mount TypeEquatorial
RA Worm Wheel180 teeth
DEC Worm Wheel180 teeth
Motor DriveStepper motor
Power Requirement12V DC
GPSBuilt-in
Polar ScopeYes, included
Counterweight ShaftØ20 mm
Worm Gear Period600 seconds

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