ASTRO-PHYSICS 400GTO Manuel d'instructions de montage - Page 4

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INTRODUCTION

The 400GTO German equatorial mount offers many fine features to provide superb performance in a compact, portable

package.

The DC servo motor drive with GTO computer system, including the keypad controller with its digital display screen and

DigitalSky Voice software offer extraordinary sophistication for today's observer. Whether you enjoy visual astronomy

exclusively or plan an aggressive astrophotography or CCD imaging program, this mount will allow you to maximize your

night out under the stars.

The advanced keypad features allow you to slew automatically to objects in a wide range of databases as well as to any

RA/Dec coordinate. A large selection of common names for stars and other objects makes your selection a snap. The rapid

slew rate of 5 degrees per second (1200x) allows you to locate objects very quickly and accurately. You will be very pleased

with the intuitive operation of this controller. There are no complicated sequences of keystrokes to remember. It is so easy

to use that even if you don't use it for a few months, you will feel at home with the keypad very quickly.

DigitalSky Voice software provides additional capabilities to control the movement of your telescope by using two-way

verbal communication with a microphone or by a few clicks of your computer mouse (or touchpad). You can remain at the

eyepiece while you direct your telescope with verbal commands. DigitalSky Voice is an observing companion who guides

you through the universe offering suggestions of objects that are fun and interesting to observe.

In order to maximize your pleasure on your first night out, we recommend that you familiarize yourself with the assembly

and basic operation of the mount indoors. The temperature will be comfortable, the mosquitoes at bay, and you'll have

enough light to see the illustrations and read the manual. Please take particular note of counterbalancing, use of the

clutches and operation of the keypad controller.

Why Polar Alignment is Important

Compensation for the Earth's rotation

If you were to take a long exposure

photograph with Polaris (often called the

North Star) in the center of the field, you

would discover that all stars seem to revolve

around Polaris. This effect is due to the

rotation of the earth on its axis. Motor driven

equatorial mounts were designed to

compensate for the earth's rotation by

moving the telescope at the same rate and

opposite to the earth's rotation. When the

polar axis of the telescope is pointed at the

celestial pole (polar aligned) as shown in

Diagram

1, the mount will follow (track) the

motions of the sun, moon, planets and stars.

As a result, the object that you are observing

will appear motionless as you observe

through the eyepiece or take astrophotos.

Diagram 1