Quasars plugin

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  | Improvements for performance. Added <tt>marker_color</tt> parameter.
  | Improvements for performance. Added <tt>marker_color</tt> parameter.
| 0.1.14
| 0.13.3
| Improvements for performance and code refactoring.

Latest revision as of 08:15, 26 April 2015


[edit] Description

The Quasars plugin provides visualization of some quasars brighter than 16 visual magnitude. A catalogue of quasars compiled from "Quasars and Active Galactic Nuclei" (13th Ed.) (Veron+ 2010).

Example (3C 249.1, also known as LEDA 2821945 or 4C 77.09): qso_3c_249.1.jpg

[edit] Using the Quasars plugin

  1. Enable the tool by clicking the tool-bar button "Load at startup"
  2. Find the quasar by their designation (3C 249.1 as example)

[edit] Section [Quasars] in config.ini file

You can edit config.ini file by yourself for changes of the settings for the Quasars plugin - just make it carefully!

ID Type Version Description
Plugin Stellarium
last_update string 0.1.1+ 0.11.2+ Date and time of last update
update_frequency_days int 0.1.1+ 0.11.2+ Frequency of updates, in days
updates_enable bool 0.1.4+ 0.11.4+ Enable updates of quasars catalog from Internet
url string 0.1.1+ 0.11.2+ URL of quasars catalog
enable_at_startup bool 0.1.10+ 0.12.2+ Enable displaying of quasars at startup of planetarium
distribution_enabled bool 0.1.4+ 0.11.4+ Enable distribution mode for the quasars
flag_show_quasars_button bool 0.1.10+ 0.12.2+ Enable displaying quasars button on toolbar
marker_color R,G,B 0.1.13+ 0.13.0+ Color for marker of the quasars (for the distribution mode)

[edit] Catalog of quasars

You can modify the catalog.json file manually using a text editor. If you are using Windows, it is strongly recommended to use an advanced text editor such as Notepad++ to avoid problems with end-of-line characters. (It will also color the JSON code and make it easier to read.)

Warning: Before editing your catalog.json, make a backup copy. Leaving out the smallest detail (such as a comma or forgetting to close a curly bracket) will prevent Stellarium from starting.

The path to the directory which contains catalog.json is something like:

  • C:\Users\UserName\AppData\Roaming\Stellarium\modules\Quasars (Windows Vista, Windows 7)
  • C:\Documents and Settings\UserName\Application Data\Stellarium\modules\Quasars (Windows XP)
  • HomeDirectory/Library/Preferences/Stellarium/modules/Quasars (Mac OS X)
  • ~/.stellarium/modules/Quasars (Linux)

(Note that this is a hidden folder, so in order to find it you may need to change your computer's settings to display hidden files and folders.)

[edit] Format of catalog

To add a new quasar, open a new line after line 5 and paste the following, note commas and brackets, they are important:

             "Quasar designation":
                   "RA": "Right ascension (J2000)",
                   "DE": "Declination (J2000)",
                   "Amag": value of absolute magnitude,
                   "Vmag": value of visual magnitude,
                   "z": value of Z (redshift),
                   "bV": value of B-V colour

For example, record for 3C 249.1:

             "3C 249.1":
                   "RA": "11h04m13.8s",
                   "DE": "+76d58m58s",
                   "Amag": -25.1,
                   "Vmag": 15.72,
                   "z": 0.313,
                   "bV": -0.02

[edit] Version history

Plug-in version Stellarium version Significant changes
0.1.1 0.11.2 First public version of plugin
0.1.2 0.11.3 Fixed few bugs (stabilization of code)
0.1.4 0.11.4 Added GUI to plug-in
0.1.5 0.12.0 Use new rendering engine of core
0.1.10 0.12.2 Added the button to toggle quasars on toolbar. Improvements for search tool. Updated code.
0.1.13 0.13.0 Improvements for performance. Added marker_color parameter.
0.1.14 0.13.3 Improvements for performance and code refactoring.

[edit] How you can help

We are welcome bug reports, feature requests and feedback through the usual channels (trackers, forums and so on).

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