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APPENDIX A - TECHNICAL SPECIFICATIONS
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NexStar 90mm NexStar 127mm
Design Maksutov-Cassegrain Maksutov-Cassegrain
Aperture 90mm 127mm
Focal Length 1250mm 1500mm
F/ratio of the Optical System 14 12
Optical Coatings Fully Coated Fully Coated
Highest Useful Magnification 213x 300x
Resolution: Rayleigh Criterion
Dawes Limit
1.55 arc seconds
1.29 arc seconds
1.1 arc seconds
.91 arc seconds
Light Gathering Power 165x unaided eye 329x unaided eye
Field of View: Standard Eyepiece 1º .83º
Linear Field of View (at 1000
yds)
53feet 44 feet
Eyepiece Magnification: 50x (25mm)
139x (9mm)
60x (25mm)
167x (9mm)
Optical Tube Length 10 inches 12 inches
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Input Voltage 12 V DC Nominal
Batteries Required 8 AA Alkaline
Power Supply Requirements 12 VDC-750 mA (Tip positive)
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Motor: Type
Resolution
DC Servo motors with encoders, both axes
.26 arc sec
Slew speeds Nine slew speeds: 3º /sec, 2º /sec, 1º/sec, .64x, 32x, 16x, 8x, 4x, 2x
Hand Control Double line, 16 character Liquid Crystal Display
19 fiber optic backlit LED buttons
Fork Arm Cast aluminum
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Software Precision 16 bit, 20 arc sec. calculations
Ports RS-232 communication port on hand control
Tracking Rates Sidereal, Solar and Lunar
Tracking Modes Alt-Az, EQ North & EQ South
Alignment Procedures Sky Align, Auto 2-Star, 2-Star, One-Star, Solar System Align
Database 99 user defined programmable object.
Expanded information on over 200 objects
Total Object Database 4,033 Objects
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