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2-year Telescope Warranty

C9 1/4-SGT (XLT) Computerized Telescope

Item # 11046-XLT

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Planetary and Lunar Imaging Long Exposure Astrophotography Planetary and Lunar Observation Deep Sky Observation
 Advanced Series GT Computerized Telescopes

Availability: In stock

$1,999.00
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Schmidt-CassegrainComputerized German EquatorialAperture
235
mm
Focal Length
2350
mm
Highest Useful Magnification
555
x
All-Star Polar Alignment Flash Upgradeable NexRemote StarBright XLT

Quick Overview

Features

General Features

  • 9.25 Schmidt-Cassegrain telescope
  • Starbright XLT high transmission coatings
  • 6x30 finderscope to help accurately find objects
  • Heavy Duty (CG-5GT) computerized German Equatorial mount
  • Ultra sturdy 2" diameter steel tripod with accessory tray
  • Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
  • “The SkyX – First Light Edition” astronomy software with a 10,000 object database, printable sky maps and 75 enhanced images

Computerized Mount Features

  • Proven NexStar computer control technology
  • 40,000 object database with over 100 user-definable objects and expanded information on over 200 objects
  • Custom database lists of all the most famous deep-sky objects by name and catalog number; the most beautiful double, triple and quadruple stars; variable stars; solar system objects and asterisms
  • DC Servo motors with encoders on both axes
  • Flash upgradeable hand control software and motor control units for downloading product updates over the Internet
  • Autoguider port for long exposure astrophotography
  • Double line, 16-character Liquid Crystal Display Hand Control with backlit LED buttons for easy operation of goto features
  • Compatible with optional NexRemote telescope control software, for advanced control of your telescope via computer
  • RS-232 communication port on hand control to control the telescope via a personal computer
  • GPS-compatible with optional SkySync GPS Accessory (93969)

C9 1/4-SGT (XLT) Computerized Telescope

Details

The C9 1/4-SGT telescope combines the unequaled optical excellence of a Celestron 9 1/4" Schmidt-Cassegrain telescope with our computerized CG-5 German Equatorial mount for the ultimate economical astrophotography system.

The 9 1/4" was specifically designed for visual infinity focus when using 2" eyepieces and has an optimized baffle system to benefit astrophotography by minimizing vignetting at the edge of the field of view.  Its longer primary focal length and lower magnification secondary mirror contribute to a flatter field of view at the focal plane and helps to further reduce optical aberrations.

This C9 1/4 optical system comes with our premium StarBright® XLT coatings.  The optimized baffling system benefits astrophotography and gives high contrast views of the planets.  With 33% more light gathering than the 8" model, the C9 1/4-S is compatible with the complete line of Celestron photographic and visual accessories.

Mounted on the Advanced GT Series computerized mount, this telescope has some high performance software and hardware features.  Operated by our proven NexStar® computer control technology the telescope has a 40,000+ object database with 100 user-definable objects and expanded information on over 200 objects. Custom database lists of all the most famous deep-sky objects by name and catalog number; the most beautiful double, triple and quadruple stars; variable stars; solar system objects and asterisms.

Using the RS-232 communication port on the hand control, you can control the telescope via a personal computer and our new flash upgradeable hand controls allow you to update your telescope's operating software via the Internet.  An Autoguider port is also included for astrophotography.

CG-5 Mount - Precision engineered for stability

Our new German Equatorial mount has precision worm gears on both axes for extremely smooth stability.  The key element that makes this system the most stable in its class is the NEW heavy-duty tripod with larger and more substantial legs that offer excellent damping characteristics for more stable views.  The CG-5 also has a convenient latitude scale for easier alignment and an optional polar finder scope for the ultimate in precision alignments.

Additional Information

Optical Design Schmidt-Cassegrain
Aperture (mm) 235 mm (9.25 in)
Focal Length (mm) 2350 mm (93 in)
Focal Ratio 10
Eyepiece 1 (mm) 25 mm (0.98 in)
Magnification 1 94 x
Finderscope 6x30
Star Diagonal 1.25
Mount CG-5 Equatorial
Accessory Tray Yes
Tripod 2 inch Stainless Steel
Power Supply Car Battery Adapter
Highest Useful Magnification 555 x
Lowest Useful Magnification 34 x
Limiting Stellar Magnitude 14.4
Resolution (Rayleigh) 0.59 arc seconds
Resolution (Dawes) 0.49 arc seconds
Photographic Resolution 200 line/mm
Light Gathering Power 1127 x
Angular Field of View (deg) 0.55 °
Linear Field of View (@1000 yds) 29 ft (8.84 m)
Secondary Mirror Obstruction 3.35 in (85 mm)
Secondary Mirror Obstruction by Diameter 36 %
Secondary Mirror Obstruction by Area 13 %
Optical Coatings Starbright Coating/XLT
Optical Tube Length 22 in (559 mm)
Telescope Weight 73 lbs (33 kg)
Counterweights 2-11 lbs
Motor Drive DC Servo motors with encoders, both axes
Slew Speeds 3°/sec
Tracking Rates Sidereal, Solar and Lunar
Tracking Modes EQ North and EQ South
Alignment Procedures AutoAlign, 2-Star Alignment, Quick Align
Software Precision 24 bit, 0.08 arcsec calculation
Motor Ports Aux Port, Autoguide Ports
Communication Ports RS-232 communication port on hand control
Computer Hand Control Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons
Database 40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects

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Knowledge Base

  1. What size of scope is best for different kinds of objects?
  2. Aperture
  3. Focal length
  4. Contrast
  5. Light gathering power and magnitude limit
  6. Telescope-Astronomy Resources on the Web
  7. What does magnitude mean?
  8. Exit pupil
  9. What are diffraction-limited optics?
  10. What is the focal ratio? How is it related to the f-stop?
  11. Near focus
  12. Field of view
  13. Magnification or power
  14. Resolution - resolving power
  15. Optical design aberrations
  16. How do I align the SCT's corrector plate and secondary?
  17. Why don't the images I see through my telescope look the same as photos I see taken with the same type of telescope?
  18. How far can I see with a telescope?
  19. How do you determine a telescope's magnification?
  20. Rough polar alignment
  21. Why do I need polar alignment?
  22. Accurate polar alignment
  23. Precise polar alignment
  24. Polar alignment for the southern hemisphere
  25. I upgraded-reflashed my hand control and now I'm not getting the control functions for my mount, but for another mount. What happened? How can this be fixed?
  26. I upgraded-reflashed my Advanced GT hand control and now I'm not getting the control functions for my mount, but for another mount. What happened? How can this be fixed?
  27. I hibernated my GOTO mount. When I powered back up and woke up the scope, it did not point as accurately as before. What gives?
  28. I'm using a focal reducer and can't seem to focus my SLR camera on my Schmidt-Cassegrain telescope (SCT). What am I doing wrong?
  29. I'm doing photography with an eyepiece, using my camera with and without a lens. What are the f-numbers of my setup for the afocal and eyepiece projection methods?
  30. Which screws are safe to remove for mounting an accessory finderscope on my Celestron Schmidt-Cassegrain telescope (SCT)?
  31. What are the pros and cons of adding aftermarket collimating screws to my Schmidt-Cassegrain telescope (SCT)?
  32. Can my NexStar hand control be repaired instead of replaced?
  33. What is back focus? What problems does it cause for visual and photographic use of my scope? What are related focus issues?
  34. I need to box up my scope and ship it. What's the best way to pack it?
  35. Why won't my image erecting eyepiece or image erecting diagonal always give right side up images with my scope?
  36. My image shifts when I'm focusing my Schmidt-Cassegrain telescope (SCT) and after I get a great focus, the focus will change. What is happening?
  37. What is field rotation? How does it affect my scope's viewing and imaging?
  38. Why do I need to guide my telescope for photography? Don't accurate alignment and firmware functions like periodic error correction (PEC) take care of it all?
  39. My GPS-equipped scope is showing the wrong time information. How do I correct this?
  40. What is a star party? Where do I find information on star parties in and around my area?
  41. I "accidentally" took apart my eyepiece, removing the lens that goes closest to my eye. Help! How do I put it back together?
  42. I am using a SkyScout Connect with my Celestron GOTO telescope. Do I still need to align my scope?
  43. I am using a GPS with my Celestron GOTO telescope. Do I still need to bother with SkyAlign?
  44. I'm looking at my Celestron scope and it has a serial number on it. Can you tell me the model, type and year it was made?
  45. I want to use the focal reducer/corrector with an aftermarket eyepiece holder. What is the best spacing, focal length, etc?
  46. How do I use the setting circles on my Celestron German equatorial mount?
  47. How do I use the RA and Dec vernier scales on my Advanced GT (AS-GT) mount's setting circles?
  48. What are the specifications for an AC adapter that will work with Celestron's
  49. What is LST? Where do I find it in my GOTO scope's menu?
  50. When I use IDENTIFY with my GOTO scope, what is it showing me?
  51. I'm upgrading my Celestron Advanced GT or CGE German equatorial mount (GEM) to firmware version GEM 4.15 or later. How does the new firmware's All-Star polar alignment work with my mount?
  52. MY Advanced GT mount is moving in the wrong direction when I use the direction arrows. What is wrong? How can I change the direction of the direction buttons?
  53. Is there any way to run Celestron's window-based drivers and software on Macs?
  54. My images with a CCD camera are showing black or white streaks on the brighter stars. They are all bloomed out. What's wrong with my scope?
  55. Where can I download the unified ASCOM drivers for Celestron?
  56. What is the operating temperature range for Celestron's telescopes?
  57. My NexStar hand control displays "Offset Too Large" when I'm trying to change my scope's alignment. What does this mean? How to I fix the issue?
  58. How much will the addition of a focal reducer increase my scope's field of view?
  59. My Celestron software won't run on my Windows 7 computer. Help!
  60. I need information on the RS-232 (serial) commands for NexStar controlled telescopes.
  61. I have two scopes I want to use side-by-side or tandem with my Celestron CGE - CGE Pro - CGEM - Advanced GT mount. Can I do that?
  62. What are the instructions for getting my CN-16 or SkySync GPS working with my Celestron GOTO mount?
  63. When should I use the CALIBRATE MOUNT utility? What does it do?
  64. I have a Celestron GOTO scope, a Mac and an autoguider. I want to autoguide with the scope. Is your autoguider port Mac-compatible?
  65. How do you stop a GOTO slew in progress? Is there a better way than turning off power or pulling the power plug?
  66. The autoguiding port diagram in my manual is different than the diagram for the NexGuide connection. Are these differences important?
  67. How do I set RA limits for my Advanced GT Mount?
  68. How do I collimate my Advanced Series GT Schmidt-Cassegrain telescope (SCT)?
  69. Is there an easy way to adjust the three collimation screws on my Advanced Series Schmidt-Cassegrain telescope (SCT)?
  70. How do I properly store my Advanced GT Schmidt-Cassegrain telescope (SCT)?
  71. What's a quick summary of All-Star polar alignment with CGEM - CGEM DX, CGE, CGE Pro and Advanced GT Series mounts?
  72. Can I use PEC with the Advanced GT Mount?
  73. What is the size of the threading holding the visual back to my Schmidt-Cassegrain telescope? Is it the same for all Celestron SCTs?
  74. How do I remove the optics from the optical tube assembly (OTA) of my Schmidt-Cassegrain telescope (SCT)?
  75. How do I remove the optics from the optical tube assembly (OTA) of my Schmidt-Cassegrain telescope (SCT)?
  76. The standard visual back on my Schmidt-Cassegrain telescope (SCT) has threads on the outside of the barrel. What are these threads for?
  77. How do I program my flash upgradeable hand control? What about motor control upgrades?

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An award-winning legacy brand for over 50 years, Celestron has grown to become the world’s leading telescope maker, and enjoys brand-name recognition among serious amateur astronomers for superior optics, outstanding design, and innovative technology. Celestron also develops a wide range of exciting products and technologies that enhance the science, outdoor and educational markets. At Celestron, we strive to inspire a sense of wonder, knowledge and fun in our customers and throughout our company.

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