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Appendix a – technical specifications – Celestron CGEM 1100 User Manual

Page 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