Equinox Systems GEMINI Manuel d'utilisateur télécharger pdf (Page 57)

Gemini Users Manual 52

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 defines a reference point and 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”

command and centering the object, you should next select “Align Telescope→Additional

Align.”

5.3.1.2 {Reset Alignment}

Occasionally, the observer wants to clear Gemini's current pointing model, and build the

model again. To clear Gemini's pointing model while retaining an original first (one) star

alignment, GoTo a star (using either "Align Telescope→GoTo Bright Star" or using

"GoTo <object>"), center it in the telescope's field of view, and then execute "Align

Telescope→Reset Alignment."

There is no displayed confirmation that the model has been reset. Instead, Gemini

presents you with the last selected object for alignment. For this reason, before doing a

"Reset Alignment," it is best to slew to the star that you want to be the first in your new

model. If you select “Reset Alignment” but do not want to reset the pointing model at

this time, escape from the Menu Mode by pressing the MENU button.

5.3.1.3 {Additional Align}

Use this function to add other alignment objects to Gemini’s pointing model.

IMPORTANT: You must already be pointing at the object on which you wish to align

before using this command. You should use either the "Align Telescope→Goto Bright

Star" command or the "GoTo <object>" command to point the telescope to a known

object, center it, and then execute “Additional Align.” After selecting “Additional Align,”

Gemini responds by verifying the object by name. Now press the RA+ button, and

Gemini displays the mount’s offset from the pole in both elevation (E) and azimuth (A),

which were calculated as a result of the alignment object.

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Equinox Systems GEMINI Manuel d'utilisateur Page 57