Celestron CGEM - 925 Computerized Telescope CGEM Series Manual - Page 56

Appendix A - Technical Specifications

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Appendix A - Technical Specifications CGEM Series Specifications: Optical Design Focal Length Finderscope Mount Eyepiece Star Diagonal Accessory tray Tripod 11097 CGEM 800 11098 CGEM 925 11099 CGEM 1100 203mm (8") SchmidtCassegrain 2032mm F/10 6x30 CGEM Computerized Equatorial 25mm Plossl (81x) 1.25" Yes 2" Stainless Steel 235mm (9.25") SchmidtCassegrain 2350mm F/10 6x30 CGEM Computerized Equatorial 25mm Plossl (94x) 1.25" Yes 2" Stainless Steel 280mm (11") SchmidtCassegrain 2800mm F/10 9x50 CGEM Computerized Equatorial 40mm Plossl (70x) 1.25" Yes 2" Stainless Steel Technical Specs Highest Useful Magnication Lowest Useful Magnification Limiting Stellar Magnitude Resolution: Rayleigh Dawes Limit Light Gathering Power Field of View: standard eyepiece Linear FOV (@1000 yds) Optical Coatings - Standard Secondary Mirror Obstruction by Area by Diameter Optical tube length Telescope Weight 480x 29x 14 .68 arc seconds .57 arc seconds 843x unaided eye .64º 33.6 ft. Starbright XLT Coating 2.7" 11% 34% 17 inches 88 lbs 555x 34x 14.4 .59 arc seconds .49 arc seconds 1127x unaided eye .55º 29 ft. Starbright XLT Coating 3.35" 13% 36% 22 inches 113 lbs 660x 40x 14.7 .50 arc seconds .42 arc seconds 1593x unaided eye .61º 32 ft. Starbright XLT Coating 3.75" 12% 34% 24 inches 120 lbs CGEM Mount Additional Specifications Hand Control Motor: Type Max Slew Speed Software Precision Hand Control Ports Motor Ports Tracking Rates Tracking Modes Alignment Procedures Database Complete Revised NGC Catalog Complete Messier Catalog Complete IC Catalog Complete Caldwell Abell Galaxies Solar System objects Famous Asterisms Selected CCD Imaging Objects Selected SAO Stars Total Object Database Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons DC Servo motors with encoders, both axes 5º/second 24bit, 0.08 arcsec calculation RS-232 communication port on hand control Aux Port, Autoguide Ports Sidereal, Solar and Lunar EQ North & EQ South 2-Star Align, 1-Star Align, Solar System Align, Quick Align, Last Align 40,000+ objects, 400 user defined programmable objects. Enhanced information on over 200 objects 7,840 110 5,386 109 2,712 9 20 25 29,500 45,492 56

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Appendix A – Technical Specifications
CGEM Series
11097
11098
11099
CGEM 800
CGEM 925
CGEM 1100
Specifications:
Optical Design
203mm (8") Schmidt-
Cassegrain
235mm (9.25") Schmidt-
Cassegrain
280mm (11") Schmidt-
Cassegrain
Focal Length
2032mm F/10
2350mm F/10
2800mm F/10
Finderscope
6x30
6x30
9x50
Mount
CGEM Computerized
Equatorial
CGEM Computerized
Equatorial
CGEM Computerized
Equatorial
Eyepiece
25mm Plossl (81x)
25mm Plossl (94x)
40mm Plossl (70x)
Star Diagonal
1.25"
1.25"
1.25"
Accessory tray
Yes
Yes
Yes
Tripod
2" Stainless Steel
2" Stainless Steel
2" Stainless Steel
Technical Specs
Highest Useful Magnication
480x
555x
660x
Lowest Useful Magnification
29x
34x
40x
Limiting Stellar Magnitude
14
14.4
14.7
Resolution: Rayleigh
.68 arc seconds
.59 arc seconds
.50 arc seconds
Dawes Limit
.57 arc seconds
.49 arc seconds
.42 arc seconds
Light Gathering Power
843x unaided eye
1127x unaided eye
1593x unaided eye
Field of View: standard eyepiece
.64º
.55º
.61º
Linear FOV (@1000 yds)
33.6 ft.
29 ft.
32 ft.
Optical Coatings - Standard
Starbright XLT Coating
Starbright XLT Coating
Starbright XLT Coating
Secondary Mirror Obstruction
2.7"
3.35"
3.75"
by Area
11%
13%
12%
by Diameter
34%
36%
34%
Optical tube length
17 inches
22 inches
24 inches
Telescope Weight
88 lbs
113 lbs
120 lbs
CGEM Mount
Additional Specifications
Hand Control
Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons
Motor: Type
DC Servo motors with encoders, both axes
Max Slew Speed
5º/second
Software Precision
24bit, 0.08 arcsec calculation
Hand Control Ports
RS-232 communication port on hand control
Motor Ports
Aux Port, Autoguide Ports
Tracking Rates
Sidereal, Solar and
Lunar
Tracking Modes
EQ North & EQ South
Alignment Procedures
2-Star Align, 1-Star Align, Solar System Align, Quick Align, Last Align
Database
40,000+ objects, 400 user defined programmable objects.
Enhanced information on over 200 objects
Complete Revised NGC Catalog
7,840
Complete Messier Catalog
110
Complete IC Catalog
5,386
Complete Caldwell
109
Abell Galaxies
2,712
Solar System objects
9
Famous Asterisms
20
Selected CCD Imaging Objects
25
Selected SAO Stars
29,500
Total Object Database
45,492