Celestron Compustar Manual de instrucciones descargar pdf (Pagina 31)

through the autoguiding software. Set the exposure time for the guiding camera so that the star is

imaged well, but not saturated. Typical exposures would be 1-3 seconds. You may have to click

on the guide star using the mouse to let the software know where your chosen guide star is on the

chip. Some autoguiding programs automatically select the brightest star on the chip.

Figure 17. An autoguider settings window. This menu has places to set calibration times

for both X and Y axes, as well as autoguider output control to the Shoestring connector.

This menu also has places to enter backlash settings for the X and Y axes . Other functions,

such as enabling simultaneous corrections in the X and Y axes, which the Compustars are

able to do, are under the advanced menu tab.

You will have to specify a calibration time for both the X (RA) and Y (Dec) axes (Figure 17).

This tells the software how many seconds you want it to activate the X and Y drives via their

relay switches during each calibration maneuver. When you activate the calibration routine, the

autoguiding software will begin by taking the commanded exposure through the guide camera. It

will then determine the initial position of the center of the guide star on the guiding chip with

sub-pixel accuracy. The software then commands the mount to move for the specified calibration

time in one direction along the X axis. The autoguider computer then takes another exposure

through the guiding camera and measures the new position of the guide star with sub-pixel

accuracy. It then attempts to return the guide star to its original position as closely as possible,

followed by measuring the new position of the guide star. Next, it repeats this entire process

moving the star in each direction along the Y axis, measuring the new position of the star after

each move. In other words, it measures the guide star‟s position after it activates the +X, -X, +Y,

and –Y relays in the relay box for the specified time periods. You will hear the relays inside the

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Celestron Compustar Manual de instrucciones Pagina 31