User manual CELESTRON C100ED-RGT Supplementary Guide

[. . . ] The following is a supplemental addendum to the included instruction manual that explains the new features of Celestron's Advanced Series Telescopes. Please refer to this addendum for information concerning the new hand control features included with your telescope. Refer to the owner's manual for step-by-step instruction on assembling and using your telescope. The Advanced Series GT, computerized version of each telescope has a hand controller designed to give you instant access to all the functions that your telescope has to offer. With automatic slewing to over 40, 000 objects, and common sense menu descriptions, even a beginner can master its variety of features in just a few observing sessions. [. . . ] Selecting Constellation from the LIST menu will display all the constellation names that are above the user defined horizon (filter limits). Once a constellation is selected, you can choose from any of the database object catalogs to produce a list of all the available objects in that constellation. · · · To see information and data about the displayed object, press the INFO key. To see the next tour object, press the Up key. Direction Buttons The hand control has four direction buttons (3) in the center of the hand control which control the telescope's motion in Declination (north and south) and Right Ascension (east and west). The telescope can be controlled at nine different speed rates. Rate Button Pressing the RATE key (11) allows you to instantly change the speed rate of the motors from high speed slew rate to precise guiding rate or anywhere in between. The number 9 is the fastest rate (3º per second, depending on power source) and is used for slewing between objects and locating alignment stars. The number 1 on the hand control is the slowest rate (. 5x sidereal) and can be used for accurate centering of objects in the eyepiece and photographic guiding. To change the speed rate of the motors: · · Press the RATE key on the hand control. Press the number on the hand control that corresponds to the desired speed. The number will appear in the upper-right corner of the LCD display to indicate that the rate has been changed. The hand control has a "double button" feature that allows you to instantly speed up the motors without having to choose a speed rate. To use this feature, simply press the arrow button that corresponds to the direction that you want to move the telescope. While holding that button down, press the opposite directional button. The direction that a star moves in the eyepiece when a direction is pressed will change depending on which side of the Meridian the telescope tube is positioned. In order to change the direction of the arrow buttons, see Scope Setup Features later in this section. 1 2 3 4 5 = = = = = . 5x 1x (sidereal) 4x 8x 16x 6 7 8 9 = 64x = . 5º / sec = 2º / sec = 3º / sec Nine available slew speeds Setup Procedures The Advanced GT contains many user defined setup functions designed to give the user control over the telescope's many advanced features. All of the setup and utility features can be accessed by pressing the MENU key and scrolling through the options: Tracking Mode This allows you to change the way the telescope tracks depending on the type of mount being used to support the telescope. The telescope has three different tracking modes: EQ North Used to track the sky when the telescope is polar aligned in the Northern Hemisphere. Used to track the sky when the telescope is polar aligned in the Southern Hemisphere. When using the telescope for terrestrial (land) observation, the tracking can be turned off so that the telescope never moves. EQ South Off Tracking Rate In addition to being able to move the telescope with the hand control buttons, your telescope will continually track a celestial object as it moves across the night sky. The tracking rate can be changed depending on what type of object is being observed: Sidereal This rate compensates for the rotation of the Earth by moving the telescope at the same rate as the rotation of the Earth, but in the opposite direction. When the telescope is polar aligned, this can be accomplished by moving the telescope in right ascension only. Used for tracking the Sun when solar observing with the proper filter. Lunar Solar View Time-Site - Displays the current time and longitude/latitude downloaded from the optional CN-16 GPS receiver. It will also display other relevant time-site information like time zone, daylight saving and local sidereal time. Local sidereal time (LST) is useful for knowing the right ascension of celestial objects that are located on the Meridian at that time. [. . . ] Once Polar Align is complete, you must re-align your telescope again using any of the alignment methods described earlier. With the telescope set up and roughly positioned towards Polaris, align the mount using the Two- Star Alignment method. Select Polar Align from the Utilities menu and press Enter. 2. Based on your current alignment, the telescope will slew to where it thinks Polaris should be. Use the equatorial head latitude and azimuth adjustments to place Polaris in the center of the eyepiece. [. . . ]