====== Deep Sky ======

===== Guide content =====

  * **[[quick_start_guide|Installation]]**
  * **[[quick_start_chart|The Chart]]**
  * **[[quick_start_solar_system|The Solar System]]**
  * **Deep Sky Objects**
  * **[[quick_start_telescope|Driving a telescope]]**
  * **[[quick_start_server|Cartes du Ciel-SkyChart as an application server]]**

===== Stars =====

You can switch on/off the display of stars with the **Chart -> Show Objects -> [[menuchart#show_objects|Show stars]]** dialog box or the {{en:documentation:i56.png|}} icon in the object bar.

You can modify the star appearance by the **Setup -> [[display#display1|Display Mode]]** dialog box or the {{en:documentation:i34.png|}} icon in the object bar (this modifies also the appearance of deep sky objects ).

**//Advanced =>//** You can find more options in the **Display Colour** tab of **Setup ->  [[display#display1|Display]]** dialog box.

You can increase the amount of stars to be shown by the {{en:documentation:i52.png|}} icon, clicking it adds 0.5 to the maximum magnitude limit. To decrease the number of displayed stars, click the {{en:documentation:i53.png|}} icon to decrease the maximum magnitude limit by 0.5. These icons are positioned in main bar.

**//Advanced =>//** You can set the maximum magnitude limit for stars by the FOV ranges in **Setup -> Chart, coordinates -> [[chart_coordinates#object_filter|Object Filter]]**.\\
You can show the proper motion of stars by **Setup -> [[display#lines|Lines]]**.



===== Deep Sky Objects =====

You can switch on/off the display of deep sky objects with the **Chart -> Show Objects -> [[menuchart#show_objects|Show Deep Sky Objects]]** dialog or the {{en:documentation:i57.png|}} icon in the object bar.\\ 
Nebulae outlines (such as M42 in Orion) can be display with the **Chart -> Show Objects -> [[menuchart#show_lines|Show Lines]]** dialog box or the {{en:documentation:lignes.png|}} icon in the object bar.

The appearance of feep sky objects can be modified by the **Setup -> [[display#display1|Display Mode]]** dialog box or the {{en:documentation:i34.png|}} icon in the object bar (this modifies also the appearance of the stars.)

**//Advanced =>//** You can find more options in the **Display Colour**, **Deep sky object Colour** tabs of **Setup -> [[display#display1|Display]]** menu.

You can increase the amount of deep sky objects to be displayed by the {{en:documentation:i54.png|}} icon, clicking it adds 0.5 to maximum magnitude limit. Clicking the {{en:documentation:i55.png|}} icon decreases the maximum magnitude limit by 0.5. These icons are positioned in the main bar.

**//Advanced =>//** You can select the display of deep sky objects by maximum magnitude limit and maximum size in arcminutes by FOV ranges in **Setup -> Chart, coordinates -> [[chart_coordinates#object_filter|Object Filter]]**.







===== Catalogs =====

The standard //Cartes du Ciel-SkyChart// installation comes with: 
  * **Bright Stars Catalog** which contains 9096 stars to a maximum magnitude of 6.5 (461 k). 
  * **SAC** which contains 10,600 deep sky objects (2.6 MB) 

**//Advanced =>//** Many other catalogs can be dowloaded from **[[http://sourceforge.net/project/showfiles.php?group_id=64092&package_id=208104|SourceForge //Cartes du Ciel-SkyChart// Catalog Download Page]]**. Some of the supplementary catalogs overlap or objects can't be drawed with a large FOV, so you can choose catalogs to activate according to your needs in **Setup -> Catalog** menu (**[[catalog#cdc_stars|CdC Stars]]** and **[[catalog#cdc_nebulae|CdC Deep Sky]]** tabs). \\

For details about downloading extra catalogs, see [[installation_of_extra_catalogs|Installation of extra catalogs]]. \\
For configuration of extra catalogs in //Cartes du Ciel-SkyChart//, see [[catalog|Catalog]]



===== Pictures =====

To obtain a more realistic appearance of deep sky objects rather than symbols, you have to download from **[[en:download#pictures]]** an excerpt of RealSky pictures corresponding to the SAC catalog content and install it. This is not bundled with //Cartes du Ciel-SkyChart//, because of it size.\\
Then, you have to build the pictures database with **Setup -> Pictures -> [[pictures#object|Object]]** tab (scan directory).

Many of the pictures are sized around 1°x1°, so they are only visible with a FOV below 30°. You can switch the display of pictures between on or off by the **Chart -> Show Objects -> [[menuchart#show_objects|Show pictures]]** dialog box or the {{en:documentation:i58.png|}} icon on the object bar.




===== DSS/RealSky =====

For any particular deep sky object, you can download a picture from the **[[http://archive.eso.org/dss/dss|DSS Site]]** by the {{en:documentation:i81.png|}} icon in the object bar.\\ 
It is temporary stored in **Your_profile\documents\Cartes du Ciel\pictures\$temp.fit** as defined in the **Setup -> [[pictures#dss_realsky|Pictures DSS/RealSky]]** tab (temporary file).\\ 
You can choose to display these pictures by the {{en:documentation:i77.png|}} icon in the object bar.

**//Advanced =>//** You can set more options in the **Setup -> Pictures -> [[pictures#dss_realsky|DSS RealSky]]** dialog box.