Celestron 80GTL manual Object Catalog, Selecting an Object, Slewing to an Object, Tour Mode

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Object Catalog

Selecting an Object

Now that the telescope is properly aligned, you can choose an object from any of the catalogs in the NexStar's database. The hand control has a key designated for each of the catalogs in its database. There are two ways to select objects from the database; scrolling through the named object lists and entering object numbers:

•Pressing the LIST key on the hand control will access all objects in the database that have common names or types. Each list is broken down into the following categories: Named Stars, Named Object, Double Stars, Variable Stars and Asterisms. Selecting any one of these options will display an alpha-numeric listing of the objects under that list. Pressing the Up and Down keys (10) allows you to scroll through the catalog to the desired object.

•Pressing any of the catalog keys (M, CALD, NGC, or STAR) will display a blinking cursor below the name of the catalog chosen. Use the numeric key pad to enter the number of any object within these standardized catalogs. For example, to find the Orion Nebula, press the "M" key and enter "042".

•Pressing the PLANET button will allow you to use the UP and DOWN arrow keys to scroll through and select the eight planets as well as the moon.

To download a list of all the stars contained in the STAR Catalog with SAO number cross references, logon to our web site at www.celestron.com.

Slewing to an Object

Once the desired object is displayed on the hand control screen, you have two options:

•Press the INFO Key. This will give you useful information about the selected object such as magnitude, constellation and fascinating facts about many of the objects.

The speed at which information scrolls across the hand control display can be changed while the information is being viewed:

Press the “1” key repeatedly to speed up the scroll speed. Press the “4” key repeatedly to slow down the scroll speed.

Press the “7” key to freeze and unfreeze the information on the display.

•Press the ENTER Key. This will automatically slew the telescope to the coordinates of the object. While the telescope is slewing to the object, the user can still access many of the hand control functions (such as displaying information about the object).

If you slew to an object that is below the horizon, NexStar will notify you by displaying a message reminding you that you have selected an object outside of your slew limits (see Slew Limits in the Utility Features section of the manual). Press UNDO to go back and select a new object. Press ENTER to ignore the message and continue the slew. The NexStar hand control will only display objects that are below the horizon if the Filter Limits are set below 0º in altitude. See Filter Limits in the Utility Feature section of the manual for more information on setting the filter limits.

Caution: Never slew the telescope when someone is looking into the eyepiece. The telescope can move at fast slew speeds and may hit an observer in the eye.

Object information can be obtained without having to do a star alignment. After the telescope is powered on, pressing any of the catalog keys allows you to scroll through object lists or enter catalog numbers and view the information about the object as described above.

Tour Mode

The NexStar includes a tour feature which automatically allows the user to choose from a list of interesting objects based on the date and time in which you are observing. The automatic tour will display only those objects that are within your set filter limits. To activate the Tour mode, press the TOUR key (6) on the hand control. The NexStar will display the best objects to observe that are currently in the sky.

•To see information and data about the displayed object, press the INFO key.

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Contents NexStar 80GTL Table of Contents Telescope Maintenance Page NexStar 80GTL Refractor Telescope Assembling the NexStar NexStar 80 GTLBalancing the Telescope tube Attaching the Telescope to the TripodErect Image Diagonal Eyepiece FocusingStar Pointer Finderscope Protective plastic cover over the battery see figure Star Pointer InstallationStar Pointer Operation Using your Solar Filter Installation and UseCleaning and Storage About the FilterOutlet Battery Pack Powering the NexStarAttaching the Hand Control HandNexStar GT Hand Control Hand Control Operation Alignment ProcedureAuto-Align Hints HelpfulTwo Star Alignment Quick-Align NexStar Re-AlignmentTour Mode Object CatalogSelecting an Object Slewing to an ObjectDirection Buttons Set Up ProceduresRate Button Alt-Az EQ NorthEQ South OffUtility Features HintPage NexStar Ready Focusing Correct image as viewed when Using erect image diagonalDetermining Field of View General Observing HintsObserving the Moon Lunar Observing HintsObserving the Planets Planetary Observing HintsSolar Observing Hints Observing Deep Sky ObjectsTerrestrial Land Viewing Terrestrial Land Viewing HintsSky Illumination SeeingCare and Cleaning of the Optics Page LPR Filter #94126A Appendix a Technical Specifications Opttiicall SpeciiffiicattiionGlossary of Terms Page Page Appendix C RS-232 Connection Communication ProtocolAppendix D Maps of Time Zones Page Page Page Page Page Page Page Celestron TWO Year Warranty

80GTL specifications

The Celestron 80GTL is a powerful and compact telescope designed for both amateur astronomers and experienced stargazers. It combines modern technology with user-friendly features, making it an excellent choice for those looking to explore the night sky. With its 80mm aperture, the 80GTL captures enough light to reveal a variety of celestial objects, from the moon’s craters to distant galaxies.

One of the standout characteristics of the Celestron 80GTL is its innovative Altazimuth mount. This mount provides smooth and precise movements in both horizontal and vertical directions, allowing users to easily track celestial objects as they move across the sky. The setup is quick and straightforward, making it ideal for beginners who may be intimidated by more complex mounts.

The telescope is equipped with Celestron’s StarScope system, which includes a computer-controlled GoTo mount. This feature allows users to automatically locate and track over 40,000 celestial objects with the push of a button. The included hand controller is intuitive and easy to navigate, giving users instant access to stars, planets, and deep-sky objects. This technology not only enhances the viewing experience but also helps novice astronomers learn about the universe with guided tours through the night sky.

Another notable feature of the Celestron 80GTL is its sturdy construction and lightweight design. Made from high-quality materials, it boasts durability while remaining portable for easy transport. Weighing just under 10 pounds, this telescope can be taken on camping trips or excursions, allowing users to enjoy astronomy in various locations.

Additionally, users will appreciate the 80GTL’s fully coated glass optics which provide excellent image quality and contrast. The included 25mm and 10mm eyepieces offer different magnifications, catering to diverse viewing preferences. Whether observing the rings of Saturn or the detail of lunar landscapes, the 80GTL promises clear and sharp images.

In summary, the Celestron 80GTL is a highly capable telescope, combining an accessible design with advanced technologies. Its user-friendly GoTo mount, quality optics, and lightweight build make it an exceptional option for anyone wishing to delve into the wonders of the cosmos, ensuring both enjoyment and education in the field of astronomy.
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