Orion ATLAS EQ-G User Manual download pdf (Page 9)

consult section 6 of this manual and attempt to polar align the

mount more accurately.

Tracking can be deactivated or activated at any time the Atlas

EQ-G mount is receiving power. In order to deactivate tracking,

simply press and hold the Guide button then press the Slow

button on the controller. Pressing the same button combination

will reactivate tracking at the default (sidereal) rate.

There are three tracking rates used by the dual-axis control-

ler:

Sidereal rate tracking is the default tracking rate for the Atlas

EQ-G mount. Celestial objects are tracked using this rate

which is equivalent to the rate of the Earth’s rotation.

Solar rate tracking is used to track the Sun over a long period

of time. Solar rate tracking is activated by pressing and holding

the Slow speed button, then the Right directional button.

Warning: Never look directly at the Sun through your tele-

scope or its finder scope, even for an instant, without a

professionally made solar filter that completely covers the

front aperture of the instrument, or permanent eye dam-

age could result. Young children should use this telescope

only with adult supervision.

Lunar rate tracking is used to track the Moon at its rate of

apparent motion across the sky. Lunar rate tracking is activat-

ed by pressing and holding the Slow button, then the Down

directional button.

Note: Solar and Lunar tracking rates can only be used when

the Atlas EQ-G has tracking activated. If tracking is deacti-

vated, you must first activate tracking by holding the Guide

button then pressing the Slow button.

Setting the Slewing Speed

In order to conveniently center an object in your telescope’s

finderscope or eyepiece, you can set the speed rate at which

the motors slew (move) the telescope when the directional

buttons are pressed. The three speed buttons located near the

top of the hand controller are used to set the slewing rates of

the mount.

The slewing speed buttons each have two different speeds

assigned to them. The slewing speed employed is dependent

on whether or not the dual-axis controller has tracking activat-

ed or deactivated (by holding the Guide button then pressing

the Slow button).

With tracking activated, the Guide button will slew the Atlas

EQ-G mount at a very slow speed equal to 1.5x sidereal rate.

This speed rate will generally be used to guide a telescope

while imaging with a camera. You can also change the Guide

button speed rate to be slightly faster or slower (see “Setting

the Guiding Speed”). If tracking is deactivated, pressing the

Guide button will set the Atlas EQ-G to slew at 32x sidereal

rate; this speed is too fast for guiding during imaging.

By pressing the Slow button with tracking activated, the Atlas

EQ-G will slew at 4x sidereal rate. With tracking deactivated,

pressing the Slow button will set the Atlas EQ-G mount to slew

at 64x sidereal rate.

With tracking activated, the Fast button will set the Atlas EQ-G

mount to slew at 8x sidereal rate. If tracking is not activated,

pressing the Fast button will set the Atlas EQ-G to slew at

800x sidereal rate; this is a very fast speed that can be used to

slew the mount from object to object across the sky.

Figure 9-1. Atlas EQ-G mount faceplate.

Power indicator light

12V DC

power jack

Power

switch

Autoguider

modular

jack

Hand controller serial jack

Figure 9-2. The Atlas EQ-G Dual-Axis hand controller

Speed

buttons

Directional

buttons

Set button

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Orion ATLAS EQ-G User Manual Page 9

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