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Celestron CGX-L EQUATORIAL Manual

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ENGLISH | 15
Tips for Adding Calibration Stars:
• Although for casual observing it is not necessary to add
calibration stars, it is recommended that you add as many
as three calibration stars for optimal point accuracy.
• Choosing calibration stars that are near the celestial
equator offer the better results than stars near the
celestial poles.
• Although it is not necessary to use calibration stars if the
telescope mount has not been moved since its original
alignment/calibration, it may be necessary to recalibrate
the telescope if the optical tube has been removed for
any reason.
Note: Meridian – The Meridian is an imaginary line in the
sky that starts at the North celestial pole and ends at the
South celestial pole and passes through the zenith. If you are
facing south, the meridian starts from your Southern horizon
and passes directly overhead to the North celestial pole.
Quick-Align
Quick-Align uses all the date and time information entered at
startup to align the telescope. However, instead of slewing to
the alignment stars for centering and alignment, the telescope
bypasses this step and simply models the sky based on the
information given. This will allow you to roughly slew to the
coordinates of bright objects like the Moon and planets and
provides the telescope with information needed to track
objects in any part of the sky (depending on accuracy of
polar alignment). Quick-Align is not meant to be used to
accurately locate small or faint deep-sky objects or to track
objects accurately for astroimaging.
To use Quick-Align, simply select Quick Align from the
alignment options and press ENTER. The telescope will
automatically use the entered date/time parameters to align
itself with the sky and display Alignment Successful.
Note: Once a Quick-Align has been done, you can use
the Re-alignment feature (see below) to improve your
telescope’s pointing accuracy.
Last Alignment
The Last Alignment method will automatically recall the last
stored index positions to continue using the alignment that
was saved when the telescope was last powered down.
This is a useful feature should your telescope accidentally
lose power or be powered down.
Re-Alignment
The mount has a re-alignment feature which allows you to
replace any of the original alignment stars with a new star or
celestial object. This can be useful in several situations:
• If you are observing over a period of a few hours, you may
notice that your original two alignment stars have drifted
towards the west considerably. (Remember that stars are
moving at a rate of 15° every hour). Aligning on a new star
that is in the eastern part of the sky will improve your pointing
accuracy, especially on objects in that part of the sky.
• If you have aligned your telescope using the Quick-Align
method, you can use Re-Align to align on actual objects
in the sky. This will improve the pointing accuracy of your
telescope without having to re-enter additional information.
• If you have used the computer-assisted polar alignment
method and have manually moved the mount, it may
be necessary to re-align the mount for improved
pointing accuracy.
To replace an existing alignment star with a new alignment star:
1. Select the desired star (or object) from the database and
slew to it.
2. Carefully center the object in the eyepiece.
3. Once centered, press the BACK button until you are at
the main menu.
4. With CGX Ready displayed, press the ALIGN key on
the hand control to select Alignment Stars from the list
of options.
5. The display will then ask you which alignment star you
want to replace. Use the UP and Down scroll keys to
select the alignment star to be replaced. It is usually best
to replace the star closest to the new object. This will
space out your alignment stars across the sky.
6. Press ALIGN to make the change.
… 15 …


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