Technical data

Chapter 5 Starmap 23
dynamically change the limits as you zoom in and out to keep a manageable number of objects displayed. This is the
default setting for the program.
Hubble Stars
The Hubble Stars dialog allows you to enable and disable the display of stars from the Hubble Guide Star Catalog.
When enabled, Hubble stars are displayed when the field of view is smaller than 20 degrees. The Hubble catalog
includes stars beyond Magnitude 16, so displays can become very dense and redrawing can slow down. Performance
can be markedly improved by copying the GSC to your hard drive during installation. If you plan to use the GSC
frequently, we recommend it be installed on your hard drive. For occasional use, the catalog can be read from your
product CDROM.
Invert Screen Colors
The Invert Screen Colors command, toggles the display between normal white stars on a black field, to black stars on
a white field. In the Inverted Screen Colors command is checked, the display will appear more like many printed star
charts.
Mirror
The Starmap Mirror function flips the display in either the Horizontal or Vertical direction. This allows the map to be
drawn to match the view that is seen through the telescope.
Zoom
The field of view shown by the starmap display is changed by using the Zoom dialog box. The field of view may be
entered in degrees , fractions of degrees, or by selecting one of the sky coverage buttons.
Since the size of the display window is variable, the map is scaled to include the selected field of view in the smaller of
the x or y directions. If you desire a precise indication of the field of view of the telescope, select the Telescope Fields
item from the Options dialog box.
Options
The Options dialog box allows you to selectively enable a wide variety of features so that you can customize the
Starmap display.