Celestron NexStar HC manual Appendix a Technical Specifications

Page 39

Appendix A - Technical Specifications

Optiicall Speciifiicatiion

Design

 

Maksutov-Cassegrain Catadioptric

Aperture

 

4 inches (102mm)

Focal Length

 

52 inches (1325mm)

F/ratio of the Optical System

13

 

Primary Mirror:

Diameter

102mm

 

Coatings

Multi-layer coating process

Secondary Mirror Spot Size

1.25"

 

Secondary Obstruction

34.4% by diameter; 11% by area

Corrector Plate:

Material

BK-7 Optical Glass

 

Coatings

A-R Coatings both sides

Highest Useful Magnification

240x

( ~ 6mm eyepiece)

Lowest Useful Magnification (7mm exit pupil)

15x

( ~ 80mm eyepiece)

Resolution: Rayleigh Criterion

1.36 arc seconds

Dawes Limit

1.14 arc seconds

Photographic Resolution

140 lines/mm

Light Gathering Power

212x unaided eye

Near Focus standard eyepiece or camera

~ 20 feet

Field of View: Standard Eyepiece

1.0º

 

: 35mm Camera

1.51º x 1.04º

Linear Field of View (at 1000 yds)

52.5 feet

Magnification: Standard Eyepiece

55x

 

: Camera

27x

 

Optical Tube Length

13.5 inches

Weight of Telescope

11 Lbs.

Ellectroniic Speciifiicatiions

Input Voltage

12

V DC Nominal

Maximum

18 V DC Max.

Minimum

8 V DC Min.

Batteries Required

8 AA Alkaline

Power Supply Requirements

12

VDC-750 mA (Tip positive)

Mechaniicall Speciifiicatiions

Motor: Type Resolution

Slew speeds

Hand Control

Fork Arm

DC Servo motors with encoders, both axes

.26 arc sec

Nine slew speeds: 4º /sec, 2º /sec, 1º/sec, .5/sec, 32x, 16x, 8x, 4x, 2x

Double line, 16 character Liquid Crystal Display 19 fiber optic backlit LED buttons

Cast aluminum, with integrated hand control receptacle

Software Speciifiicatiions

Software Precision

16 bit, 20 arc sec. calculations

Ports

RS-232 communication port on hand control

Tracking Rates

Sidereal, Solar, Lunar and King

Tracking Modes

Alt-Az, EQ North & EQ South

Alignment Procedures

AutoAlign (2-star alignment)

Database

25 user defined programmable object.

 

Enhanced information on over 100 objects

 

 

Total Object Database

4,033

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Image 39
Contents Page Celestial Coordinate System Telescope Maintenance Some of the many standard features of the NexStar include Flip Mirror Focuser Knob Direction Buttons Page Assembling the NexStar Powering the NexStarFlip Mirror Control Focuser Knob Hand ControlEyepiece EyepieceStarPointer DiagonalStar Pointer Finderscope with Mounting Bracket Star Pointer FinderscopePage Hand Control Rate Button Utility FeaturesGuideStar Software NexStar Hand Control Hand Control Operation Alignment ProcedureEnter More Information Object CatalogSelecting an Object Slewing to an ObjectTour Mode Direction ButtonsObserving Tip Setup Procedures User Objects Helpful Utility FeaturesNexStar Ready Image Orientation Focusing Calculating MagnificationDetermining Field of View General Observing Hints Celestial sphere seen from the outside showing R.A. and DEC Celestial Coordinate SystemMotion of the Stars Definition Polar Alignment with optional WedgeAttaching a Camera to the NexStar Photography with the NexStarFinding the North Celestial Pole Observing the Planets Observing the MoonTransparency Observing the SunObserving Deep Sky Objects Seeing ConditionsSeeing Care and Cleaning of the Optics Super Modified Achromatic SMA Eyepieces 11/4 Page Page Appendix a Technical Specifications Appendix B Glossary of Terms Page Page Appendix C Maps of Time Zones Page Page Page Page Page Page Page Celestron ONE Year Warranty Page Addendum to Nexstar Telescope Manual

NexStar HC specifications

The Celestron NexStar Hand Controller (HC) is an advanced control unit designed to enhance the astronomical observation experience for both novice and experienced stargazers. This innovative device is an integral part of the NexStar telescope series and offers a range of features that simplify the process of locating celestial objects.

One of the main features of the NexStar HC is its user-friendly interface. The controller is equipped with a large, illuminated LCD screen that displays essential information clearly, even in low-light conditions. The layout is intuitive, allowing users to quickly familiarize themselves with its functions. The keypad includes dedicated buttons for common tasks, making it easy to navigate the expansive database of celestial objects.

The NexStar HC boasts an impressive database containing over 40,000 celestial objects, making it a powerful tool for astrophotography and observational astronomy. Users can access planets, stars, galaxies, and nebulae at the touch of a button. The built-in database allows for precise and efficient locating of objects, significantly reducing the time spent searching the night sky.

One of the standout technologies featured in the NexStar Hand Controller is the GoTo functionality. This advanced tracking technology enables the telescope to automatically locate and track celestial objects with high precision. By entering the desired object into the controller, users can allow the telescope to autonomously adjust its position, providing a hassle-free experience.

Additionally, the NexStar HC supports various alignment methods, including SkyAlign, AutoAlign, and One-Star Align. These alignment techniques assist in calibrating the telescope for optimal tracking and positioning. The SkyAlign method, in particular, allows users to point the telescope at any three bright stars, and the HC will calculate the telescope's location in relation to those stars, making alignment accessible even for beginners.

The NexStar Hand Controller is also compatible with Celestron’s StarSense technology, enabling automatic alignment using a smartphone. This feature allows users to refine their observations seamlessly and provides a modern twist to traditional stargazing methods.

Other notable characteristics include programmable go-to tracking speeds and the ability to save user-defined locations. The controller’s ergonomic design ensures comfort during long observing sessions, while the robust build quality guarantees durability.

In summary, the Celestron NexStar Hand Controller combines a wealth of features and cutting-edge technologies to enhance the stargazing experience. Its user-friendly interface, extensive database, versatile alignment methods, and compatibility with advanced tracking systems make it an indispensable tool for anyone looking to explore the wonders of the night sky.