Get Ra/Dec; Get Alt-Az; Goto R.a/Dec; Goto Alt-Az - Celestron NexStar GPS Instruction Manual

Save Land Object:
Enter R.A. - Dec:
GoTo 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

Goto Alt-Az

- Allows you to enter a specific altitude and azimuth position and slew to it.
To store a set of coordinates (R.A./Dec) permanently into the NexStar database, save it as a
User Defined Object as described above.
Helpful
Hint
U U U U t t t t i i i i l l l l i i i i t t t t y y y y F F F F e e e e a a a a t t t t u u u u
U U U U t t t t i i i i l l l l i i i i t t t t y y y y F F F F e e e e a a a a t t t t u u u u
Scrolling through the MENU (9) options will also provide access to several advanced utility
functions within the NexStar such as; Periodic Error Correction , Anti-Backlash and Calibrate
Level.

Anti-backlash

the gears. This play is evident by how long it takes for a star to move in the eyepiece when the
hand control arrow buttons are pressed (especially when changing directions). The NexStar's
anti-backlash features allows the user to compensate for backlash by inputting a value which
quickly rewinds the motors just enough to eliminate the play between gears. The amount of
compensation needed depends on the slewing rate selected; the slower the slewing rate the
longer it will take for the star to appear to move in the eyepiece. Therefore, the anti-backlash
compensation will have to be set higher. You will need to experiment with different values; a
value between 20 and 50 is usually best for most visual observing, whereas a higher value may
be necessary for photographic guiding.
desired object is centered in the eyepiece, simply scroll to the "Save Sky Obj"
press ENTER. The display will ask you to enter a number between 1-25 to identify the object.
Press ENTER again to save this object to the database.
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
enter a number between 1-25 to identify the object. Press ENTER again to save this object to the
database.
You can also store a specific set of coordinates for an object just by entering the R.A. and
declination for that object. Scroll to the "Enter RA
display will then ask you to enter first the R.A. and then the declination of the desired object.
To go to any of the user defined objects stored in the database, scroll down to either GoTo Sky
Obj or Goto Land Obj Obj Obj Goto Land Obj Goto Land Goto Land
ENTER. NexStar will automatically retrieve and display the coordinates before slewing to the
object.
- Allows you to input a specific R.A. and declination and slew to it.
r r r r e e e e s s s s
r r r r e e e e s s s s
– All mechanical gears have a certain amount of backlash or play between
Save Land Obj" command and press ENTER. The display will ask you to Save Land Obj Save Land Obj
Enter RA- - - - DEC " Enter RA Enter RA
Obj and enter the number of the object you wish to select and press Obj Obj
22
Save Sky Obj" command and Save Sky Obj" Save Sky Obj"
DEC " command and press ENTER. The DEC " DEC "
GoTo Sky GoTo Sky GoTo Sky
M ENU
U T ILIT IE S
AN T I-BAC K LAS H
A Z M P O S IT IV E
A Z M N E G A T IV E
A L T P O S IT IV E
A L T N E G A T IV E
S LE W LIM IT S
S L E W A L T M A X
S L E W A L T M IN
CALIBRAT E M OT ORS
PE C
P L A Y B A C K
R E C O R D
DIR E CT ION BU T T ON S
A Z M B U T T O N S
A L T B U T T O N S
CALIBRAT E LE V E L
N O A L IG N M E N T
P R E S S E N T E R
LIG H T C ONT R OL
D IS P L A Y O F F
D IS P L A Y O N
K E Y P A D O F F
K E Y P A D O N
G PS ON /OFF
G P S O N
G P S O F F
FAC T OR Y S E T T IN G
P R E S S U N D O
P R E S S "0 "