Astronomy Specialist

PLANEWAVE CDK700 OBSERVATORY SYSTEM

$275,000.00

 

Prices do not include shipping costs. Contact us for exact shipping prices before purchasing. 

 

PlaneWave Instruments brings a fully automated observatory class telescope to the market with the CDK700, a 0.7 meter Alt-Az telescope system, combining the revolutionary CDK optical design that founded PlaneWave Instruments with an innovative direct-drive alt/az mount technology that sets a new standard for small observatory telescopes.

CDK700 Features

  • Pinpoint stars out to a 70mm image circle
  • Ultra-low thermal expansion fused silica optics
  • Dual Nasmyth focus, allowing simultaneous mounting of two instruments or easy switching between visual and imaging use
  • Direct-drive motors on each axis for smooth, fast, and virtually silent movement of the telescope
  • High resolution encoders on each axis for precise positioning
  • Zero backlash
  • Zero periodic error
  • PointXP mount modelling software
  • Field de-rotator / rotational field framing

 An alt/az mount is inherently more stable than an equatorial mount since there is no cantilevered mass, nor are there any large protruding counterweights to create a dangerous hazard in a public observatory. An alt/az telescope is also considerably more compact than its equatorial counterpart, allowing a larger telescope to fit in a smaller enclosure. The mass it takes to make a rigid alt/az mount is substantially less, leading to cost savings.

Unlike German Equatorial mounts, there are no meridian flips to deal with. You can image from horizon to horizon continuously if desired. Alt/Az is more intuitive to use and no polar alignment is needed. Besides, it is the way the professionals do it!

Benefits of Nasmyth focus

The Nasmyth Focus is along the altitude axis so there are virtually no balancing issue as you change out equipment. Eyepieces remain at a constant wheelchair-accessible height, greatly simplifying access to the telescope for public observatories. The rotating tertiary mirror allows you to switch from one Nasmyth port to the other in just seconds, allowing observers to easily transition between imaging and visual use.

Rotating tertiary mirror

The CDK700 includes an integrated rotator for the tertiary mirror, with magnetic locks to position the mirror precisely for either Nasmyth focus position. The rotator can move from one port to the other in under 10 seconds.

Direct drive motors and encoders

Direct Drive motors mean that there are no gears to cause backlash and periodic error. With high-resolution encoders providing the feedback for the direct drive motors, not only will the telescope track without periodic error or have any backlash at all, but the mount will be able to counter against wind gusts. The direct drive motors can move the telescope at incredible speeds for tracking satellites or just to minimize target acquisition time.

 

Optical system

Aperture 700 mm (27.56")
Focal length
4540 mm
Focal ratio
f/6.5
Central obstruction
47% of the primary mirror diameter
Backfocus from mounting surface
309 mm
Optical performance (400-900 nm)
1.8μ RMS at 25 mm on-axis; 4.4μ RMS at 21 mm off-axis; 6.8μ RMS at 35 mm off-axis
Image scale
22μ per arcsecond
Optimal field of view 70 mm image circle
Construction
Dual truss structure with Nasmyth focus
Fully baffled field 60 mm
Weight 544 kg
Dimensions 93.73″ H x 43.25″ W x 39″ D


Primary mirror

Optical diameter
700 mm
Outer diameter 714.38 mm
Material
Fused silica (quartz)
Core diameter
203 mm
Edge thickness
57.15 mm
Radius of curvature 4115 mm

 

Secondary mirror

Optical diameter
312.4 mm
Outer diameter 317.5 mm
Material
Fused silica (quartz)
Thickness
25 mm
Cell
3 point RTV
Radius of curvature 2961 mm

 

Tertiary mirror

Optical major diameter
152.4 mm
Thickness
25 mm
Material
Fused silica (quartz)

 

Mechanical structure

Fork assembly
Single piece U shaped fork arm assembly for maximum stiffness
Azimuth bearing
20" diameter thrust bearing
Altitude bearing
2 x 8.5" OD ball bearings
Optical tube
Dual truss structure with Nasmyth focus

 

Motion control

Motor control
Industrial grade Parker brushless motor control system and built in electronics
Motors
Direct Drive 3 Phase Axial-Flux Torque Motors
Encoders
10 inch disk built into both axes with stainless steel encoder tape on the circumference with reader yields 16 million counts per revolution of the telescope. Translates to about 0.08 arcsecond resolution.
Motor torque
Approximately 30 ft-lbs continuous; 60 ft-lbs peak
Drive electronics
Capable of controlling up to 4 high speed encoders, limit switch inputs, homing switch inputs, controls two additional motors for accessories, two brake outputs and 16 digital and 2 analogue inputs
Control software Incorporates PointXP mount modelling software by Dave Rowe All ASCOM compatible.

 

System performance

Pointing accuracy 10 arcsecond RMS with PointXP Model
Pointing precision
2 arcsecond
Tracking accuracy
<1 arcsecond error over 10 minute period
System natural frequency
10 Hz or greater
Field de-rotator accuracy
3 microns of peak to peak error at 35mm off-axis over 1 hour of tracking (18 arcsec)


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