Celestron NexStar HC - Manual (Page 21)

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Sidereal This rate compensates for the rotation of the earth by moving the
telescope at the same rate as the rotation of the earth, but in the opposite
direction. When the telescope is polar aligned, this can be accomplished
by moving the telescope in Right Ascension only. When mounted in Alt-
Az mode, the telescope must make corrections in both R.A. and
declination.
Lunar Used for tracking the moon when observing the lunar landscape.
Solar Used for tracking the Sun when solar observing using a proper solar filter.
King As light passes through our atmosphere, atmospheric refraction affects the
apparent motion of objects across the sky. The King rate takes this into
account and compensates for the refraction of the atmosphere.
User Objects
The NexStar can store up to 20 different user defined objects in its memory. The objects can
be daytime land objects or an interesting celestial object that you discover that is not included
in the regular database. There are several ways to save an object to memory depending on
what type of object it is:
.
Save Sky Object: The NexStar stores celestial objects to its database by saving its right ascension and
declination in the sky. This way the same object can be found each time the telescope is
aligned. Once a desired object is centered in the eyepiece, simply scroll to the "Save Sky
Save Sky Save Sky Save Sky
O O O Obj bj bj bj " " " " command and press ENTER. The display will ask you to enter a number between 1-9
to identify the object. Press ENTER again to save this object to the database.
Save Land Object: The NexStar can also be used as a spotting scope on terrestrial objects. Fixed land objects
can be stored by saving their altitude and azimuth relative to the location of the telescope at
the time of observing. Since these objects are relative to the location of the telescope, they
are only valid for that exact location. To save land objects, once again center the desired
object in the eyepiece. Scroll down to the "Save Land Obj
Save Land Obj Save Land Obj Save Land Obj" command and press
ENTER. The display will ask you to enter a number between 1-9 to identify the object. Press
ENTER again to save this object to the database.
GoTo Sky Object: To go to any of the user defined sky objects stored in the database, scroll down to "GoTo
GoTo GoTo GoTo
Sky Sky Sky Sky Obj Obj Obj Obj" and enter the number of the object you wish to select and press ENTER.
NexStar will automatically retrieve the coordinates and slew to the object.
GoTo Land Object: To go to any of the user defined land objects stored in the database, scroll down to "GoTo
GoTo GoTo GoTo
Land Land Land Land Obj Obj Obj Obj" and enter the number of the object you wish to select and press ENTER.
NexStar will automatically retrieve the coordinates and slew to the object.
To replace the contents of any of the user defined objects, simply save a new object using one of the existing identification
numbers; NexStar will replace the previous user defined object with the current one.
Get RA/DEC
- Displays the right ascension and declination for the current position of the telescope.
Get Alt-Az
- Displays the relative altitude and azimuth for the current position of the telescope.
Goto R.A/ Dec - Allows you to input a specific R.A. and declination and slew to it.