Click the ‘Tool’ icon located on the toolbar to open the setting dialog. Select “Stars” in the left column to
open the star setting pane.
The main StellarWindow star catalog is called the “Hipparcos and Tycho2 Catalog” containing
approximately 2.6 million stars covering up to those of the 16th magnitude. There
are two different display modes to display these stars: Photo Simulation Mode and Actual View Mode.
When using StellarWindow in the Standard Mode, the Photo Simulation Mode is set by default
while the Actual View Mode is set when using StellarWindow in the Light Mode.
Actual View Mode
With this mode, the magnitudes of the stars recorded in
the star chart are accurately reproduced to enable the actual
view of the starry sky to be reproduced. An applicable
darkest magnitude*1can be specified optionally. It is reported
that setting the darkest magnitude within the range
of 2 to 3 is suitable to reproduce the actual starry sky observed in Tokyo. The tones of the
Milky Way photos (designed to be used as the screen background) and the photos of nebulas
and star clusters are quite dark as a result of the reproduction of the actual view.
The Actual View Mode is the default display mode when using StellarWindow in the Light
Mode. In addition to achieve light operations, this mode is also useful to reproduce the actual
starry sky and to use StellarWindow solely to perform celestial body searches.
Photo Simulation Mode
In order to reproduce a photo of the starry sky, this mode
simulates the photo shooting process of the starry sky by
means of calculations. While an optional darkest magnitude
cannot be specified with this mode *2, a parameter ranging from 1.0 to 2.0*3
can be selected to specify the amount of stars subject to display. The default parameter is set at 1.4. The larger this figure becomes the greater the amount of stars becomes apparently. It is also the case that the
larger this figure becomes the brighter the stars become apparently. After changing the parameter
value, click the “Recalculation” button to confirm the new value. It may take some
time to complete the recalculation procedure.
The photos of the Milky Way, nebulas and star clusters are displayed with almost no darkening
effect. The Photo Simulation Mode is the default display mode when using Stellar-
Window in the Standard Mode.
By default, the names and Bayer codes of the stars displayed do not appear on the screen.
Tick the boxes “Overlay star name” and “Overlay Bayer code” locating on the “Display setting”
screen so that the common names and Bayer codes of the stars displayed are overlaid
on the images appearing on the main screen.
Light green are set as the default overlay display colors to describe star names and Bayer
codes. As shown in the screenshot below, optional colors can be selected by clicking the
“Color well” located on the setting screen.
Screenshot showing the stars’ names and Bayer codes overlaid on the images
As the initial setting, no information is overlaid on the images appearing on the screen. The display setting for star names and Bayer codes can be carried out separately.
Light greenare set as the default overlay display colors to describe star names and Bayer codes. As shown in the screenshot below, optional colors can be selected by clicking the
“Color well” located on the setting screen.
Click the Color well button to open the color selection dialog.
Using the color selection dialog, the desired color can be selected by
clicking the color spectrum or inputting a numeric figure ranging from ‘0’
to ‘255’ applicable individually to the shades of red, green and blue.
The amount of stars to be loaded into the star chart can be restricted for the purpose of memory saving. This is able to save a maximum of approximately 80MB memory capacity. In the Light Mode, the maximum memory saving setting
is enabled by default while this is not the case of the Standard Mode.
Memory saving setting
The memory saving setting screen. It is recommended only for experienced users to change the memory saving setting.
When specifying the darkest magnitude of stars subject to display, the memory capacity required is exhibited in the bottom of the setting screen. Click the “Setting” button so that the darkest magnitude specified is recorded. Restart
StellarWindow to enable the new memory saving setting.
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*1 Setting of the darkest magnitude
A magnitude of the darkest
stars can be specified
optionally. The smaller
the magnitude becomes
the brighter the stars
become. The default darkest
magnitude is set at 7.0.
Stars darker than those of
the 7th magnitude (=stars
of magnitudes that are
larger than 7.0) are therefore
not displayed. It may
be necessary to specify a
magnitude smaller than
7.0 when reproducing the
actual view of the starry
sky observed in a big city
such as Tokyo.
*2 Darkest magnitude
setting applicable to
the Photo Simulation
Mode
While there is no direct
setting dialog,the darkest
magnitude applicable
when using the Photo
Simulation Mode can
be specified through a
different setting feature.
To achieve this, enable the
memory saving feature
(explained later in this
section) and specify the
darkest magnitude so that
any stars of magnitudes
darker than the darkest
magnitude specified are
not loaded. In this manner,
the darkest magnitude
applicable to the memory
saving feature works as
that applicable to photo
simulation calculations.
This allows the user
using a PC with a limited
memory capacity or low
specifications to use the
Photo Simulation Mode.
*3 Parameters
designed to determine
the amount of stars
subject to display
In principle, parameters
designed to determine
the amount of stars to be
displayed on the screen
are in proportion with the
photo shooting exposure
time. StellarWindows’
photo simulation calculation
process however
adopts photology differing
from that applicable to
the actual photo shooting
(i.e. stars that are too
bright are peaked out with
StellarWindow). These
parameters are therefore
not strictly in proportion
with the photo shooting
exposure time.
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