Handleiding Meade ETX-90AT (pagina 19 van 60) (Engels)

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Which One’s the Alignment Star?

If you’re not familiar with objects in the night sky, how can you be sure if the star

in your eyepiece is really the alignment star?

The rule of thumb is that an alignment star is usually the brightest star in that

area of the sky. If you perform a GO TO to an alignment star and you're not sure

if you have located the alignment star or it isn't in the eyepiece, look through your

viewfinder. When you view an alignment star in the viewfinder, it stands out

dramatically from the rest of the stars in that portion of the sky. The viewfinder

will help you locate a star more quickly than the eyepiece, because it has a much

wider field of view than the eyepiece. Using Autostar, set the slew speed to 6

(push Number key 6) or higher and use the Arrow keys to center the alignment

star in the viewfinder. If your viewfinder has been aligned with the telescope, the

alignment star should now be in the eyepiece. Set the slew speed to 4 or less

and center the star in the eyepiece. Also see the

SPIRAL SEARCH tip, page 20.

ETX TIPS

Important Note: Before aligning the telescope, you MUST first initialize

Autostar, as described in

INITIALIZING AUTOSTAR, page 18. See MOVING

THROUGH AUTOSTAR’S MENUS, page 17, for a description of how

Autostar’s keys operate.

How to perform the Easy Align Procedure

If you have just performed the initialization procedure, go to step 6.

1. Sun Warning: Press the key prompted by Autostar to accept.

Getting Started: Press ENTER to continue.

3. Enter Date: Enter the current date, then press ENTER.

4. Enter Time: Enter the current time. Select "AM," "PM," or 24-hour clock (blank).

Then press ENTER.

Daylight Savings: Select “Yes” or “No,” then press ENTER.

6. Alignment Option Screen: “Setup: Align” displays. Press ENTER.

7. Select Alignment: “Align: Easy” displays. Press ENTER.

8. Set Home Position: Autostar then prompts you to set the telescope in the Alt/Az

Alignment home position (if necessary). To set your telescope in the "Alt/Az"

home position:

• Loosen the telescope’s vertical lock (

6, Fig. 1).

• Level the tripod head. See Step #3g, page 12. Level the optical tube by

lining up 0° on the Dec setting circle (

16, Fig. 1) with the Dec pointer

(the small molded triangle under the setting circle).

• Retighten the vertical lock (6, Fig. 1) to a firm feel only.

• Unlock the horizontal lock (9, Fig. 1).

• Grasp the telescope by a fork arm and rotate the telescope counterclockwise

until it stops.

• Turn the telescope clockwise until a fork arm is directly over the computer

control panel.

• Re-lock the R.A. lock (

9, Fig. 1).

• Lift and rotate the telescope and tripod until they point North. Press ENTER.

See LOCATING THE CELESTIAL POLE, page 53 for more information.

9 . Star Alignment: Autostar chooses two stars to align upon. When the telescope

slews to the first star for alignment, it may not appear in the field of view in the

eyepiece. Try to locate the star using the viewfinder (

2, Fig. 1). The alignment star

should be easily recognized and be the brightest star in the area of the sky where

the telescope is pointing. Look through the viewfinder and use the Arrow keys to

move the telescope until the star is visible. Then center the star in the eyepiece.

Press ENTER. Repeat the procedure for the second alignment star.

Important Note:

The first time you use

your telescope or if you

are experiencing any

problems with pointing

accuracy, follow the

procedure described in

APPENDIX C: TRAINING

THE DRIVE

, page 56, to

insure accurate pointing

and tracking.

Tip:

The GO TO key also

allows you to perform a

spiral search." A spiral

search is useful when the

telescope slews to an

object, but that object is

not visible in the eyepiece

after the telescope

finishes its search. (This

sometimes occurs during

an alignment procedure.)

Press GO TO when the

telescope stops slewing.

The telescope begins to

move in a spiral pattern at

a very slow speed around

the search area. Look

through the

eyepiece and when the

object does become

visible, press MODE to

stop the spiral search.

Then use the Arrow keys

to center the object.

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