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Occasionally, OGS will have for sale quality pre-owned astronomical instrumentations. This month you will find the following pre-owned products featured.

Science Center Observatory Closing. Available Immediately!   

RC24-140FN Complete Dome! This 5 year old system is for sale with a 1 Year "Brand New"  OGS performance warranty. This a complete turnkey system is an astronomer's dream.

This systems Features:

    24" Ritchey-Chretien Tube Assembly with invar spacing rods and electronic secondary focus.

    140FT, OGS's top of the line mount with PC-TCS Control System and Nano Stepping motors.

    Complete Dome with Comsoft's dome control system fully integrated with PC-TCS for 100% remote control.


PC-TCS Controller
PC-TCS is a Personal Computer based Telescope Control System designed for use with moderate to large permanently mounted  astronomical telescopes. The software will run on all IBM-class computers.

PC-TCS provides the observer with a highly flexible battery of motion control functions handsomely matching the demands of astronomical observing. As much as possible, system complexity is minimized by the use of a "Menu Driven" user interface that, in most cases, requires only single keystrokes to make the telescope perform complex tasks.
Learn more about PC-TCS>>

And all PC-TCS-controlled OGS telescope systems will script with the integration of this ASCOM compliant operating system. 
Learn more about ASCOM>> 


Click on pictures  for a larger image.



Optical System
Primary Diameter 24.0"
Specular Precision 1/25, or better, wave front RMS  
Mirror Substrate Near-zero expansion ceramic
Focal Ratio f/8.0
Image Scale 42.1 arc sec/mm
Tube Diameter 29"
Tube Length 66"
Tube Cooling 12 V DC fans (active cooling)
Material AL 
Focuser Tube I.D. 4.2"
Available Back Focus 11.5"
Secondary Diameter 8.5"
Sec. Focus Range (electric standard)  12"
Focus Stabilization, w. Al tube Invar 36


OGS-140 Fork
Aux. Instrument Cap. 75 lbs.
Tracking Precision <1 arc sec RMS (after modeling)
Pointing Precision <30 arc sec RMS (after modeling)
R. A. Drive 18" 570 tooth worm gear & ball bearing worm
DEC Drive 15" 360 tooth worm gear & ball bearing worm
Shafts 6.0" (140mm at R. A.  bearing ends; 75mm at DEC ends)
Motors Five-phase nano-step
Axis Intersection 72" from base of pier (at 40)
Fork Swing Clearance 18"
Weight (system) 1025 lbs.
R. A. Counterweights 2 x 5 lbs.
Pier 32" high, typically (custom heights available)
Fasteners 18-8 stainless steel