Quasars plugin

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Line 60: Line 60:
  | Fixed few bugs (stabilization of code)
  | Fixed few bugs (stabilization of code)
  | ''0.1.3''
  | 0.1.4
  | ''0.11.4''
  | 0.11.4
  | Added GUI to plug-in
  | Added GUI to plug-in
| ''0.1.5''
| ''0.12.0''
| Use new rendering engine of core

Revision as of 10:46, 9 September 2012



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

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)

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.)

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

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

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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