Equinox Systems GEMINI Uživatelský manuál stáhnout pdf (Strana 25)

Gemini Users Manual 20

Make sure that you are certain of the identification of all stars that you use for alignment.

If you misidentify a star that is far from the correct star, Gemini will reject the

“Additional Alignment.” However, if you align on the wrong star that is close to the

correct star, Gemini will accept the erroneous “Additional Alignment,” and errors will be

introduced into the pointing model causing inaccurate GoTo operation. You can use the

Setup→Mount Parameters→Pointing Model→Undo Last Align command to undo the

most recent alignment done.

2.4.3.2 Slewing to and Aligning on your First Star

After you have chosen 3 alignment stars, you are ready to start the alignment process.

When you cold started, Gemini assumed that the mount was perfectly polar aligned,

level, in the counterweight down position, and that the telescope was pointing north (or

south in the southern hemisphere). It then built an initial model based on these

assumptions.

Select and GoTo the first of the chosen alignment stars. The easiest way to do this is to

select the “Align Telescope→GoTo Bright Star” from the menu. You can then use the

DEC buttons to scroll through the list of Bright Stars that are currently above the horizon.

When you see the name of the star you want to use, press the RA+ button, and Gemini

will slew close to that star. Depending on how well you polar aligned your mount and

assuming that your location, date, and time are all accurate, the target star may even be in

the field of view of a low power eyepiece. The Hand Controller will now be in Telescope

Control Mode, and you should use its buttons (with the aid of a finder scope if necessary)

to locate and center the star in your eyepiece. Once the star is centered, press the “Menu”

button to enter Menu Mode, and select “Align Telescope→Synchronize.” It will confirm

the object you are pointing to. Finally, press RA+ to complete the first step of alignment.

To summarize:

• Choose 3 alignment stars that differ in RA by at least one or two hours

• Select “Align Telescope→GoTo Bright Star”

• Select your first alignment star from the submenu

• Mount will slew close to that star

• Use Hand Controller buttons to center the star in the eyepiece

• Select “Align Telescope→Synchronize”

• Display will confirm the object to which you are pointing

• Press RA+ to complete the alignment

2.4.3.3 Additional Alignments

If you are satisfied with the rough accuracy of a one star alignment, you may skip this

section. Otherwise, you should now repeat a similar process with at least 2 more stars on

the same side of the meridian. Select “Align Telescope→GoTo Bright Star” from the

menu and select your next alignment star from the list of Bright Stars. Press RA+ to

GoTo that star, and again use the Hand Controller buttons to center the star in your

eyepiece. Now select “Align Telescope→Additional Align.” As before, Gemini will

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Equinox Systems GEMINI Uživatelský manuál Strana 25