Sky ChartsConfiguration details |
Configuring the appearance of objects
The section "Colors" gives you the option of choosing the appearance, in color, black and white, or red. The selection "Invisible" displays labels without displaying the objects. The sky color can be fixed as defined in the first section or be set to automatically change to reflect the actual sky luminosity. You can also change the sky color for the different twilight phases by clicking in the blue rectangles after "Automatic" has been selected.
The next selection lets you adjust the size of the
stars according to their magnitude. Use the buttons
brightness +/- and contrast +/- to alter the absolute
or relative size of the stars. The "Reset" button
returns the contrast and brightness to their default
values.
The box "Bitmap stars" controls the display mode for
the stars. Once selected you can also change the
bitmap file used to draw the stars. The file
MediumLightColor resets the image to the default
value. Some of these files are available with the
program but you can also create your own. Next, select "Show" if you want to display the Milky Way and the desired isophote line or hash. The nebulae drawing can be a color symbol as defined in the first section or a gray surface. If you select the gray surface you can adjust the gray level used to represent the various surface brightnesses of the objects.
The last line lets you choose the file containing the
description of your local horizon.
Selecting "Invisible" removes all objects below the
horizon of the chart. "Ground Color" permits you to
choose the color of the chart below the horizon. Labelling objects It is possible to assign a label to the type of object that has been selected: If the option "Display" is checked, then a label is displayed for all selected objects. The option "Options" lets you choose the information you want to display (name, magnitude, coordinates), where the information is displayed (left or right), the label text color and size, and the type of object that is to be displayed. The magnitude limit prevents displaying a label for fainter objects. The option "Short Name" will use the shortest posible name for the label, i.e. a greek letter for the bright stars.
Free Label
The "Add Label" option of the chart popup menu (right
click on chart) lets you enter text anywhere in the
chart. Select the label position relative to the
cursor position, the color and size. Then type the
text you want.
Simulation:
If you don't know your observatory coordinates click
"Map" and select your location on the map using the
mouse. Projection types
The available projections are:
by E. Griessen, AIPS memo 27
The selected projection described up to here can be
modified according to the header of the file in FITS
format containing WCS when you load such an
image. Displaying images
The image is loaded in a preview window. You can
modify the display tresholds (min and max), the color
palette (composite colors LUT and intensity tables
ITT) and zoom a portion of the image using the
mouse. For FITS format files, which contain the coordinates RA, DE or GLAT, GLON (i.e. the images provided from DSS-ESO or IRAS) the program uses the coordinates and the projection from the header of the FITS format to automatically position the image in relation to the current chart. Please note that it is only possible to zoom a section of the image from the preview window and not on the main screen, otherwise the automatic positioning does not work. For other image formats it is necessary to place the image on the chart manually. You can of course use the function "Online Resources "to download an image directly from the Internet.
It is possible to derive the initial thresholds from
the information contained in the file header, from
the lowest and highest values or from the average
plus one or two standard deviation values. The right mouse button clicked on a file name displays the header of the file in the format FITS or PIC.
For bitmap formats check the option "Bitmap Palette" from the selection box "Image Color". In this case all the other functions are disabled. Otherwise and if the image is a 24 bit format, the program generates a gray level from the average of all the RGB planes (plane=0) or each color independently (plane=1,2,3). In both cases the image can be modified as FITS or PIC format files. You can save the current image in a file in BMP format and reuse it later with the same appearance.
The following formats are supported: The OK button loads the image into the current chart.
Bulk calculation of asteroids
Online Resources
This menu takes you directly to the Internet
resources.
The following resources are available: Images corresponding to displayed chart: - SkyView : Images in all wave lengths - ESO Skycat Digitized Sky Survey : Palomar atlas for the whole sky. The image dimension is limited to 1600 square minutes. The size of the corresponding file is 2.5 KB multiplied by the square size in minutes. - ESO Skycat Digitized Sky Survey 2: The same survey but with a 15 micron scan rather than 25 micron. The pixel resolution is 1 arcsec instead of 1.7 arcsec. The files are three times bigger. Extraction of large star catalogs: The data requested from these catalogs corresponding to the current chart is stored in a temporary file and automatically defined as catalog according to the magnitude, the disabling is done in this panel. HST Guide Star Catalog (20,000,000 stars) - CDS VizieR: Stars up to the magnitude 15. The field is limited to 5 degrees or 5000 stars.
- ESO Skycat: Stars
up to magnitude 15. The field is limited to 2 degrees
or 1000 stars. USNO-A (526,000,000 stars) - CDS Vizier: USNO-A2.0 Stars up to magnitude 20. The field is limited to 2 degrees or 5000 stars. - ESO Skycat: USNO-A1.0 Stars up to magnitude 20. The field is limited to 2 degrees or 5000 stars. GSC 2.2 (455,851,237 stars) - STSCI GSC 2.2: Stars up to magnitude 18.5. The field is limited to 1 degree or 5000 stars.
Comets and asteroids
You can carefully modify some default options in the
file EXTRES.INI. If you want to use a proxy server
follow these instructions: HEASARC SkyView
This panel gives you the ability to directly obtain a
sky image corresponding to the current chart.
Do not modify the default value of "Coord" and
"Field" if you want an image for the current
chart.
Pixel X and Pixel Y represent the number of pixels of
the image. If these two fields are empty, then the
resolution of the catalog will be used. If you plan to keep the file for later use, give it a name in the corresponding field but do not modify the extension ".fit".
Estimation of the file size: |