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Appendix A - Technical Specifications
Optical Specification NexStar 8 GPS NexStar 11 GPS
Design Schmidt-Cassegrain Catadioptric Schmidt-Cassegrain Catadioptric
Aperture 8" (203.2mm) 11" (279mm)
Focal Length 2032mm 2800mm
F/ratio of the Optical System 10 10
Primary Mirror: Material
Coatings
Fine Annealed Pyrex
Starbright Coatings - 5 step multi-layer process
Fine Annealed Pyrex
Starbright Coatings - 5 step multi-layer
process
Secondary Mirror: Material
Coatings
Hand Figured Fine Annealed Pyrex
Starbright Coatings - 5 step multi-layer process
Hand Figured Fine Annealed Pyrex
Starbright Coatings - 5 step multi-layer
process
Central Obstruction 2.7" 3.75"
Corrector Plate: Material
Coatings
Optical Quality Crown Glass
A-R Coatings both sides
Optical Quality Crown Glass
A-R Coatings both sides
Highest Useful Magnification 480x (~4mm eyepiece) 660x (~4mm eyepiece)
Lowest Useful Magnification (7mm exit pupil) 29x (~70mm eyepiece) 40x (~70mm eyepiece)
Magnification: Standard Eyepiece ( 40mm Pl) 51x 70x
Resolution: Rayleigh Criterion
Dawes Limit
.68 arc seconds
.57 arc seconds
.50 arc seconds
.42 arc seconds
Photographic Resolution (theoretic at 410nm) 200 line/mm 200 line/mm
Light Gathering Power 843x 1593x
Near Focus w/ standard eyepiece or camera ~25 feet ~60 feet
Field of View: Standard Eyepiece
: 35mm Camera
.91º
1º x .68º
.66º
.72º x .50º
Linear Field of View (at 1000 yds) 47.5 ft. 34.5 ft.
Optical Tube Length 21" 25"
Weight of Telescope 42 lbs 65 lbs
Weight of Tripod 26 lbs 26 lbs
Electronic Specifications
Input Voltage
Maximum
Minimum
12 V DC Nominal
15 V DC Max.
9 V DC Min.
Power Supply Requirements 12 VDC-1.5A (Tip positive)
Cord Management Internal Slip Ring Design
Mechanical Specifications
Motor: Type
Resolution
DC Servo motors with encoders, both axes
.113 arc sec
Slew speeds Nine slew speeds: 3º /sec, 2º /sec, .5º/sec, 64x, 16x, 8x, 4x, 1x, .5x
Hand Control
Double line, 16 character Liquid Crystal Display
19 fiber optic backlit LED keypad
Fork Arm Dual Fork tine cast aluminum, with integrated hand control receptacle
Gears 5.625", precision bronze gears on both axes, 180 tooth
Bearings 9.5" Roller Azimuth Bearing
Optical Tube Carbon Fiber
Software Specifications
Software Precision 16 bit, 20 arc sec. calculations
Ports RS-232 communication port on hand control, Autoguider Port,
2 Auxiliary Port
Period Error Correction Permanently programmable
Tracking Rates Sidereal, Solar, Lunar
Tracking Modes Alt-Az, EQ North & EQ South
Alignment Procedures GPS Align, AutoAlign, Two-Star Align, Quick-Align, EQ North Align & EQ
South Align
Database 40,000+ objects, 50 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