Technical
Information
The technical information on this page is for reference only. Please
contact manufacture for latest information and verification depending on your application.
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The Celestron
Ultima 8 PEC Specifications
Celestron International |
| Design |
Schmidt-Cassegrain
Catadioptric |
| Nominal Focal Length |
80.6 inches, 2048mm |
| Nominal Focal Ratio |
f10 |
| Effective Aperture |
8 inches, 203.2mm |
| Central Obstruction |
2.75" |
| Light Gathering Power |
843X Theoretical, Approx. 634X Actual over unaided human
eye with 7mm entrance pupil. |
| Primary Mirror |
8.25" Diameter, f1.9, Radius
32", Spherical of fine annealed Pyrex® |
| Secondary Mirror |
2.25" Diameter, Radius 9.7,
Spherical (final hand figuring yields a slight asphere) of fine annealed Pyrex® |
| Mirror Coatings |
Celestron "Starbright®": 5
step multilayer |
| Corrector Lens |
8" Aperture, 0.190" thick,
optical quality crown glass, true aspheric Schmidt curve each side, Mgf2 AR coatings each
side |
| Highest Useful Magnification |
Approx. 480x with eyepiece or
"negative" lens/Eyepiece combination |
| Lowest Typical Magnification |
37x (1.34 degrees) with 2" 55mm
Plossl (5.46mm Exit Pupil), or 32X (1.33 degrees) with 1.25" 40mm Plossl with f6.3
Reducer/Corrector (6.30mm Exit Pupil) |
| Resolution, Visual |
Rayleigh Criterion: 0.68 arc seconds,
Dawes Limit: 0.57 arc seconds |
| Resolution, Film |
182 lines per mm |
| Back Focus |
18 + or - 5 inches |
| Optimum Back Focus |
Approx. 4 inches; with f6.3
Reducer/Corrector 4" from rear of Reducer |
| Near Focus |
Approx. 25' (Camera or Visual) |
| Optical Tube Dimension |
Length 16", Diameter 9", Front
Cell Diameter 9-1/8" |
| Optimum Back Focus |
Approx. 4 inches; with f6.3
Reducer/Corrector 4" from rear of Reducer |
| Image Scale (CCD or Film) |
100 arc seconds per mm, 64 arc seconds per mm |
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The Celestron Advanced Astromaster Serial Connection Schematic
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Model
ST-7CCD Specifications
Santa Barbara Instrument Group |
CCD |
Kodak KAF-0401E
+ TI TC-211 |
Pixel
Array |
765 x 510
pixels, 6.9 x 4.6 mm |
Total
Pixels |
390,000 |
Pixel
Size |
9 x 9
microns |
Full
Well Capacity (ABG) |
~50,000 e- |
Full
Well Capacity (NABG) |
~100,000 e- |
Dark
Current |
1e¯/pixel/sec
at 0° C |
Antiblooming |
Standard
(non ABG as option) |
| Shutter |
Electromechanical |
Exposure |
0.11 to 3600 seconds, 10ms
resolution |
Correlated
Double Sampling |
Yes |
A/D Converter |
16 bits |
A/D Gain |
2.3e¯/ADU |
Read Noise |
15e¯ RMS |
Binning Modes |
1 x 1, 2 x 2, 3 x 3 |
Pixel
Digitization Rate |
30 kHz |
Full Frame
Acquisition |
under 13 seconds |
| Field of View |
12 x 8 arcminutes |
Pixel Size |
.9 x .9 arcseconds |
Limiting
Magnitude |
Magnitude 14 in 1 second |
(for 3
arcsec FWHM stars) |
Magnitude 18 in 1 minute |
Cooling -
standard |
Single Stage
Thermoelectric, Active Fan, -25 C from Ambient Min. |
Cooling -
optional |
Two Stage
Thermoelectric, Active Fan, Liquid Assist, -40 C from Ambient Min. |
Temperature
Regulation |
±0.1°C |
Power |
5 VDC at 1.5 amps, ±12
VDC at 0.5 amp desktop power supply included |
Computer
Interface |
Standard Parallel Port |
Computer
Compatibility |
PC - MS-DOS, Windows 95/98/NT, Macintosh
With Optional MAC SCSI adaptor |
Guiding |
Dual CCD Self-Guiding |
| Optical Head |
5 inches
diameter x 3 inches 12.5 cm diameter x 7.5 deep 2 pounds/0.9 Kg |
CPU |
All electronics integrated
into Optical Head, No CPU |
| Mounting |
T-Thread,
1.25" and 2" nosepieces included |
Backfocus |
0.92
inches/2.3 cm |
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Model
5.5 Observatory |
| Manufactured from 1/8 inch polyester impregnated ISO
Thermal Reinforced Glass Fiber incorporating the maximum U.V. inhibitors available with
F.R.P. technology. Finish is White Gel-Coat except inside dome which is painted black
Gel-Coat
Observatory Dimensions:
| Base Diameter: 7ft |
Dome Diameter: 5.5 ft |
Door: 27 x 47 inches |
| Height: 103 inches |
Shutter: 20 inches |
Dome Rotation: (8) 3 inches diameter wheels |
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Advanced
Astromaster |
| Digital setting circle for Telescope including optical
encoders and integrated computer and object database. Serial connection allows interface
to PC in support of planetarium packages like "The Sky" from Software Bisque. |
| Dimensions 3.6'' x 5.8" x 1.3" |
Weight: 8 ounces |
Operating Temperature: 10C to +5-C |
| Display: LED |
Display Resolution .1 degree |
Database 10,000 objects. NGC, IC, ESO,UGC,Planets |
| Encoders: RA 4000 step (.09 Degree resolution). DEC 2160 step
(.17 degree resolution) |
Sampling Rate: .4 millisecond |
Power: 5.1 to 12 Volts DC |
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Pier |
| The pier is a custom manufactured by a local
fabricator. Telescoping arm was designed by Boyd Observatories. Pier is filled with sand
for vibration dampening. Pier's unique design allows for maximizing floor space. |
| Total Weight: 160 pounds |
Height: 60 inches |
6" x 6" x 1/8" thick steel channel |
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Base plate: 10" x 10" x 1/2" |
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Telescope Control & Acquisition System Schematic