Handleiding Meade ETX-90AT (pagina 53 van 60) (Engels)

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5. Press ENTER repeatedly until “Setup: Align” displays.

6. Press the Scroll Down key repeatedly until "Setup: Telescope" displays. Press

ENTER. “Telescope: Telescope Model” displays.

7. Press the Scroll Down key repeatedly until "Telescope: Mount" displays. Press

ENTER. “Scope Mounting: Alt/az” displays.

8. Press the Scroll Down key once. "Scope Mounting: Alt/az" displays. Press ENTER.

"Telescope: Mount" displays again.

9. Press Mode once. “Setup: Telescope” displays.

10. Press the Scroll Down key once. "Setup: Targets" displays.

11. Press ENTER. "Targets: Terrestrial" displays. Press one of the Scroll keys once.

"Targets: Astronomical" now displays.

12. Use the Arrow keys to locate a bright star in the night sky. Use the viewfinder (

2, Fig.

1) to help line up on the star. You may choose any unobstructed, bright star for the

purposes of this example. Use Autostar's Arrow keys to center the star in the

eyepiece. Once the star is centered, press ENTER to select "Astronomical." The

telescope's tracking motors then engage. It may take the tracking motors several

seconds to begin tracking. When they do, it may be necessary to once again center

the star in the eyepiece. The tracking motors will then keep the star you have chosen

in the center of the eyepiece.

13. Press and hold the ENTER key for a few seconds and then release to stop

tracking. You may repeat the procedure to locate another star or object using the

Arrow keys. Then press ENTER to re-engage the tracking motors.

Caution: Do not move the tripod or adjust the latitude setting while

observing or the mounting alignment will be lost. The telescope's motor drive dis-

engages when the Horizontal and the Vertical lock levers are unlocked and

re-engages when the levers are relocked.

Autostar Polar Alignment

Autostar provides three different (manual) methods for polar alignment: Easy,

One-Star and Two-Star.

Easy Polar Alignment

Two alignment stars are chosen by Autostar based on the date, time and location. First,

choose "Polar" from the "Setup: Telescope: Mount" menu. The rest of the

procedure is identical to the Alt/Az EASY (TWO-STAR) ALIGN, page 19.

One-Star Polar Alignment

Polar One-Star Alignment requires some knowledge of the night sky. Autostar

provides a database of bright stars and one star from this database is chosen by the

observer for alignment. Polaris is chosen by Autostar. First, choose "Polar" from the "Setup:

Telescope: Mount" menu. The rest of the procedure is almost identical to the Alt/Az

ONE

STAR ALT/AZ ALIGNMENT, page 38, except that Autostar prompts you to point the

telescope at Polaris and center it in the telescope eyepiece.

Two-Star Polar Alignment

Polar Two-Star Alignment requires some knowledge of the night sky. Autostar provides a

database of bright stars and two stars from this database are chosen by the observer for

alignment. First, choose "Polar" from the "Setup: Telescope: Mount" menu. The rest of the

procedure is almost identical to the Alt/Az TWO STAR ALT/AZ ALIGNMENT, page 39.

Locating the Celestial Pole

To get basic bearings at an observing location, take note of where the Sun rises (East) and

sets (West) each day. After the site is dark, face North by pointing your left shoulder toward

where the Sun sets. To precisely point at the pole, find the North Star (Polaris) by using the

Big Dipper as a guide (Fig. 49).

Important Note: For almost all astronomical observing requirements,

approximate settings of the telescope’s latitude and Polar axis are

acceptable. Do not allow undue attention to precise Polar Alignment of the

telescope to interfere with your basic enjoyment of the instrument.

Fig. 46: Set latitude.

Fig. 47: Example of Polar

Alignment. Note that the face

of the tilt-plate points North.

North

Celestial

Pole

North

Celestial

Pole

Fig. 48: Example of Polar

Alignment. Note that the face

of the tilt-plate points North.

This is the Polar home

position.

Important Note:

In order to select any of

three polar alignment

options, you must first

select "Polar" in the

"Mount" option of the

"Setup: Telescope" menu.

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