CGE PRO Computerized Telescopes
Celestron's newest line of observatory class German equatorial telescopes
The CGE Pro computerized series is Celestron's newest line of observatory class German Equatorial telescopes. Offered with 9.25", 11" and 14" aperture Schmidt Cassegrain optical tubes, they all come mounted on the new state of the art CGE Pro GoTo mount.Learn More »
The German Equatorial mount has long been the favored choice of astronomy buffs and astrophotographers because of its stability and portability. More stable because the center of gravity is directly over the center of its base, more portable because it can be broken down into smaller component parts for easy storage and transportation.
For astrophotography, the German Equatorial mount offers easier balancing, unlimited space at the rear of the telescope tube to mount a camera, and whole sky access. Now you can enjoy all of the NexStar software and database features with the extra stability and portability of a German Equatorial mount.
CGE PRO Tracking Data
The following graphs display R.A. worm gear tracking accuracy of the CGE Pro Equatorial mount in 4 conditions: Figure 1 – Raw unguided tracking that isolates the periodic error; Figure 2 – Tracking with Permanent Periodic Error Correction (PPEC) enabled; Figure 3 – Guided tracking with an autoguider; and Figure 4 – Guided tracking with an autoguider and PPEC enabled. Data was acquired from Celestron’s engineering team using an EdgeHD 800 optical tube and NexImage camera at f/10. This data represents the typical performance of a CGE Pro under average seeing conditions from urban skies in Torrance, CA. Figure 2 has a cubic fit applied to the graph, and Figures 1, 3 and 4 have linear drift removed (to better show repeatable error). All Figures show 22 minutes of tracking, which covers 4 full rotations of the CGE Pro R.A. worm gear.
Figure 1. This graph displays the R.A. worm gear tracking accuracy for a typical CGE Pro equatorial mount. The graph shows 4 periods of the worm gear which yields about +/-7 arc seconds of periodic error. The minimal periodic error is both very predictable and gradual, allowing short unguided images to be taken, or much longer exposures with extremely accurate tracking when used with an autoguider.
Figure 2. With the CGE Pro’s Permanent Periodic Error Correction (PPEC) enabled, most of the periodic error is eliminated, leaving behind lesser tracking errors caused by atmospheric turbulence, wind, and opto-mechanical flexure. PPEC brings the CGE Pro’s R.A. tracking accuracy to about +/-2 arc seconds, allowing even longer unguided exposures (for uses like Hyperstar imaging).
Figure 3. Autoguiding with the CGE Pro provides consistent tracking accuracy to within +/-2 arc seconds under average seeing conditions. Autoguiding provides an easy way to sustain long-exposure astro-images without excessive tracking error or drift.
Figure 4. With autoguiding and PPEC enabled, we can take full advantage of the CGE Pro’s stability and tracking accuracy. Even under average seeing conditions, PPEC + autoguiding easily yields tracking accuracy of less than +/-2 arc seconds. Note that tracking errors of the mount have dropped so far below the noise floor set by the seeing conditions that they cannot be quantitatively distinguished from zero. This combination will provide the best tracking accuracy, resulting in sharp, round stars in your astro-images.
CGE PRO Product Tour Video