broader understanding of certain concepts. See Chapters 2 through 4 of this manual for
further clarification.
5.3.1 Align Telescope
GoTo Bright Star
Reset Alignment*
Additional Align*
Synchronize
Polar Al. Assist*
Polar Axis Corr.*
Although "Align Telescope" is the first menu item encountered after a "Cold Start," it is
not necessarily the first that should be used. If Gemini has been powered on for the very
first time, has had its CMOS parameters reset, has been moved to a new geographic
location, or is about to be used in a different Hand Controller mode than previously
employed, "Setup" is the menu item that should be used first, and all needed parameters
should be entered therein.
After a "Cold Start," pressing the MENU button displays "Align Telescope" with a
limited submenu containing only "GoTo Bright Star" and "Synchronize." The remaining
items of the submenu become visible after the first star alignment.
5.3.1.1 GoTo Bright Star
GoTo Bright Star is a convenient way to slew to a bright star for the purpose of doing
an alignment. It is essentially equivalent to selecting a bright star from the Object
Database and executing a GoTo command.
Select "Align Telescope
GoTo Bright Star"
to
display a list of bright stars currently
above the horizon. Scroll through the list until a suitable alignment star is found. Then
press the RA+ button on the Hand Controller to select the star and cause the telescope to
slew toward it. When it arrives at the star, the LED displays FINISHED
and goes
blank.
If Gemini was powered on with the telescope polar aligned and in the Startup Position,
the targeted star will either be in the telescope's field of view or close to it. Center the
star in the field of view using the Hand Controller. Next, press the MENU button and
select "Align Telescope
Synchronize. When the selected star is confirmed on the
display, press the RA+ button again, and "Aligned!" appears, indicating that this first star
alignment was successful. This is the first in a series of alignments required to build a
pointing model for GoTo accuracy. This is the same procedure that you would use after a
Warm Start or Warm Restart, but rather than starting a pointing model, it
synchronizes the existing pointing model with the actual sky.
You can also use GoTo Bright Star to slew to stars for subsequent alignments after the
procedure described above. In this case, after executing the GoTo Bright Star
Gemini Users Manual
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