User manual CELESTRON NEXSTAR 4GT

[. . . ] Addendum For NexStar GT Hand Control Section Of The Owner's Manual. The following is an addendum to the NexStar GT section of the owner's manual that explains the current operation and added features to your NexStar hand control. Please refer to these pages for specific information regarding telescope alignment and hand control functions. Celestron International Technical Support Dept. Torrance, CA 90503 310-328-9560 www. celestron. com Celestron International, 2835 Columbia Street, Torrance, CA 90503 · Phone (310) 328-9560 · Fax (310) 212-5835 The Hand Control The NexStar GT's hand controller is designed to give you instant access to all the functions the NexStar has to offer. With automatic slewing to over 4, 000 objects, and common sense menu descriptions, even a beginner can master its variety of features in just a few observing sessions. [. . . ] Once the alignment star is centered in the field of view of the eyepiece, press the ALIGN key (2) to accept this position. NexStar will then ask you to select and center a second alignment star and press the ALIGN key. It is best to choose alignment stars that are a good distance away from one another. Select the desired star (or object) from the database and slew to it. Carefully center the object in the eyepiece. Once centered, press the UNDO button until you are at the main menu. With NexStar Ready displayed, press the ALIGN key on the hand control. The display will then ask you which alignment star you want to replace. Use the UP and Down scroll keys to select the alignment star to be replaced, and press ENTER. It is usually best to replace the star closest to the new object. This will space out your alignment stars across the sky. Press ALIGN to make the change. 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. 6 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. [. . . ] U T ILIT IE S S E T U P T IM E -S IT E AN T I-BAC K LAS H A Z M P O S IT IV E A Z M N E G A T IV E A L T P O S IT IV E A L T N E G A T IV E S LE W L IM IT S SLEW ALT M AX S L E W A L T M IN D IR E C T ION BU T T ON S AZM BUTTO NS ALT B UTTO NS LIG H T C ON T R OL D IS P L A Y O F F D IS P L A Y O N K E Y P A D O FF KEY PAD ON S E LE C T M OD E L Setup Time-Site - Allows the user to customize the NexStar display by changing time and location parameters (such as time zone and daylight savings). Anti-backlash ­ All mechanical gears have a certain amount of backlash or play between the gears. This play is evident by how long it takes for a star to move in the eyepiece when the hand control arrow buttons are pressed (especially when changing directions). The NexStar's anti-backlash features allows the user to compensate for backlash by inputting a value which quickly rewinds the motors just enough to eliminate the play between gears. The amount of compensation needed depends on the slewing rate selected; the slower the slewing rate the longer it will take for the star to appear to move in the eyepiece. [. . . ]