Celestron 4 - page 18

• Pressthe RATE key on the hand control. The LCD will display the current speed rate.

• Pressthe number on the hand control that correspondsto the desired speed.

Thehand control has a "double button" feature that allows you to instantly speed up the motors without having to choosea

speed rate. To use this feature,simply press the arrow button that corresponds to the direction that youwant to move the

telescope. While holding that button down, press the oppositedirectional button. This will increase the speed to the

maximumsl ew rate.

The NexStar contains many user defined setup functions designed to give the user control over the telescope's many

advancedfeatures. All of the setup and utilityfeatures can be accessed by pressing the MENU key and scrolling through the

options:

Tracking Mode - Oncethe NexStar is aligned the tracking motors will automatically turn on and begin tracking

thesky. However, the tracking can be turned off for terrestrial use:

Alt-Az Thisi s the default tracking rate and is used when the telescope is placed on

a flat surface or tripod without the use of an equatorial wedge. The

telescopemust be aligned with two stars before it can track in Alt-Az.

EQNorth Used to track the sky when the telescope is polar aligned using an

equatorialwedge in the Northern Hemisphere.

EQSouth Used to track the sky when the telescope is polar aligned using an

equatorialwedge in the Southern Hemisphere.

Off When using the telescope for terrestrial(land) observation, the tracking

canbe turned off so that the telescope never moves.

Tracking Rate - Inaddition to being able to move the telescope with the hand control buttons,the NexStar will

continually track a celestial object as it moves across the night sky. The tracking rate can be changed

dependingon what type of object is being observed:

Sidereal This rate compensates for the rotation of the earth by moving the

telescope atthe same rate as the rotation of the earth, but in the opposite

direction. When the telescope is polar aligned, this can be accomplished

bymoving the telescope in Right Ascension only. Whenmounted in Alt-

Az mode, the telescope must make corrections in both R.A. and

declination.

Lunar Usedfor tracking the moon when observingthe lunar landscape.

Solar Usedfor tracking the Sun when solar observing using a proper solar filter.

View Time-Site -View Time-Site will display the last savedtime and longitude/latitude entered in the hand control.

Sidereal Time –Displaysthe Sidereal time for your current time and location. Thisis useful for knowing the right

ascension of celestialobjects that are located on the local meridian at that t ime.

Filter Limits – When an alignment is complete, the NexStar automatically knows which celestial objects are abo ve the

horizon. As a result, when scrolling through the databaselists (or selecting the Tour function), the NexStar hand control

will display only those objectsthat are known to be above the horizon when you are observing. You can customize the

object database by selecting altitude limitsthat are appropriate for your location and situation. For example, if you are

observingfrom a mountainous location where the horizon is partially obscured, youcan set your minimum altitude limit to

read+20º. This will make sure that the hand controlonly displays objects that are higher in altitude than 20º.