5
6. Now you will see the beginning of the list of alignment stars contained in the
LX200’s memory.
There are 33 choices in alphabetical order so it may save you time over the course
of the semester to learn where some bright stars with names beginning with A and
B are in the sky.
Before you choose a star find it in the sky and if you are not yet familiar with
bright stars and constellations it might be worth double checking that you have
the correct star with the instructor or TA.
Press the Next key to move the arrow down the list of stars until you get to the
one you want (if you go past it use the Previous key to go back up)
Select the star by pressing enter
7. The display will read (Center “the star you chose in step 6” and then press ENTER)
You may move the telescope manually: UNLOCK the Dec and RA clamps and
point the telescope towards the star. Sight along the telescope and adjust the
telescope until you can see the star in the finder, then fine tune until it is centered
in the finder and then the eyepiece.
Or you may move the telescope electronically: Make sure the speed is set to
SLEW (this button on the keypad should be lit up). Use the N, S, E, and W
buttons to move the telescope until it is aimed at the star. When you can see it in
the finder, switch the speed to FIND to center it in the finder. Then change the
speed again to CNTR and center the star in the eyepiece.
The more carefully you center the star in the eyepiece, the more precisely your
telescope will be aligned. Early in the semester when you will be looking at
bright objects and not using the telescopes internal object library to find faint
objects, it is not important to align the telescope too precisely. Just make sure that
the star is somewhere near the center of the eyepiece. Later in the semester, when
you may want to rely on the telescope to find very faint objects, a more precise
alignment will be necessary.
Once you have centered the star in the eyepiece, press enter. Try not to delay too
much between centering the star and pressing enter since at this point the
telescope is not yet tracking the stars and thus if you wait too long the star will
drift out of the center of the eyepiece.
8. Repeat steps 6 and 7 for the second star EXCEPT FROM THIS POINT ON DO
NOT UNLOCK THE RA AND DEC CLAMPS AND ATTEMPT TO MOVE
THE TELESCOPE MANUALLY. This will result in the telescope “forgetting”
where it is pointed and you will need to start the alignment process all over. Move
the telescope only by using the keypad at speeds SLEW, FIND, or CNTR in
directions N, S, E, and W.
9. After you have completed aligning the second star, the display should read
(TELESCOPE/OBJECT LIBRARY). You are ready to use the telescope for
observation now!
(38 Seiten)
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