iOptron GEM28 - Appendix A. Technical Specifications

32
Appendix A. Technical Specifications
Mount
German Equatorial Mount (GEM)
Payload*
Up to 28 lb (12.7kg), exclude counterweight
Mount weight
10 lb (4.5kg)
Payload/Mount weight
2.80
Structure Material
All metal, Casting + CNC machined
Periodic Error (PE)**
<±10 arcsec for GEM28
<0.3 arcsec rms for GEM28EC
PEC
Permanent PEC/Real-time PEC
Right Ascension worm wheel
Φ88mm, 144 teeth aluminum
Declination worm wheel
Φ88mm, 144 teeth aluminum
Right Ascension axis shaft
Φ35mm steel
Declination axis shaft
Φ35mm steel
Right Ascension bearing
Φ55mm ball bearing
Declination bearing
Φ55mm ball bearing
Worm gears
Φ15.2mm, brass
Motor drive
1.8° stepper motor, 128X microdivision
Resolution
0.17 arc seconds
Transmission
Synchronous belt
Latitude adjustment range
0º ~ 60º
Azimuth adjustment range
± 6º
Polar Scope
iPolar
TM
electronic polar scope or AccuAlign
TM
dark
field illuminated optical polar scope
Level indicator
Level bubble
Hand Controller
Go2Nova
®
8409 with 212,000 objects database
Tracking
Automatic
Speed
1×,2×,8×,16×,64×,128×,256×,512×,MAX(6°/sec)
Power consumption
0.5A(Tracking), 0.8A(GOTO)
Power requirement
12V, 5A
AC adapter
100V ~ 240V (included)
Wi-Fi
Built-in
Communication port
Yes (USB and Wi-Fi)
Autoguide port
Yes (ST-4 compatible)
Firmware upgrade
Yes
PC computer control
Yes
Dovetail saddle
3.8” spring loaded Vixen-style, center adjustable
Counterweight shaft
Φ20mm X306mm (M16)
Counterweight
10 lb (4.5kg)
Tripod
1.5" Stainless Steel(5kg), or LiteRoc
TM
1.75"(7.5kg)
GPS
Optional external 32-channel GPS
Autoguider
Optional external iGuider
Operation temperature
-10ºC ~ 40ºC
Warranty
Two year limited
* OTA size and length dependent, smaller than 6” in diameter recommended.
** Measured with encoder on bench, 10 minutes