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Stellarium
Stellarium is a free software or more exactly a shareware (because you can donate them some money to support their efforts) that uses an intuitive and user-friendly graphic interface. Since its first release in 2004, it is very appreciated by amateur astronomers but also by professionals who find in it a powerful tool to simulate astronomical events in the past, present (in real time or fast pacing) or in the future, specially educators and science historians among others.
By default, Stellarium can display more that 600000 stars but extra catalogs allow to display up to 177 million stars up to magnitude ~18. There are over 80000 deep sky objects (DSO) and in option you can add extra catalogs including more than 1 million DSO.
Stellarium also displays asterisms and illustrations of the constellations for more than 20 different cultures, pictures of nebulae (including the full Messier, NGC and IC catalogs), major galaxies including clusters of galaxies, the Milky Way, and a very realistic atmosphere, sunrise and sunset glows, and of course planets and their moons. If needed you can download parameters of all existing comets and asteroids (via F2, Plugins, Solar System Editor, Confure..) but have at your disposal several gigabytes of free disk space.
Stellarium can simulate the sky in the past or in the future but with limitations. According to the Stellarium User Guide 2017, Appendix E, thanks to VSOP87 analytical ephemeris model (via F2) that matches with the run DE200 from NASA JPL, you can simulate the sky between 4000 BC and 8000 AD with accuracy. Nch prism plus 6 00 24. But for most planetary events, you can only get the highest accuracy (about 1') for the last 2000 years or even less : between 500-3500 AD for Galilean satellites, between 1826-2047 AD for the Earth's Moon, and between 1885-2099 AD for Pluto (cf. Appendix E page 294).
Outside these ranges, the excessive extrapolations don't give accurate positions (don't try to simulate a celestial event like an solar eclipse or a transit 50000 years in the past or you will probably miss it !).
Knowing its relative limitations, Stellarium is very impressive by its ability to simulate without apparent slowness the movement and the aspect of almost any kind of celestial body in high resolution.
| At left, picture of Saturn and six of its satellites taken by Jamie Cooper on January 26, 2006 with a Celestron Schmidt-Cassegrain C14 telescope 356 mm f/10 equipped with a webcam. It is the stacking of several color photos. At right, the simulation with Stellarium by the author. |
Once downloaded and installed, you need to enter your location (or later via F6), adjust your time zone, and select a background panorama. You can also replace that panorama with one of the many provided by users (cf. Landscapes) or use your own panoramic HD picture that you will copy in a subfolder of landscapes in Stellarium in PNG format 2048x275 pixels (via F4, Landscape. See this tutorial on YouTube).
Optionally you can configure via the menus F2 (Display) and F4 (Configure), tens of secondary parameters like the language, the brightness of the sky glow, the brightness and scintillation of stars, the limit magnitude of stars, the frequency of meteors, labels (size, color, density), display pictures of DSO, the location of pulsars, novaes, quasars, exoplanets and add catalogs of tens of others deep sky objects (M, IC, NGC, Abell, PGC, UGC, ESO, etc).
To be up-to-date, in addition you can download from external sources, additional data like orbital parameters of comets and asteroids (via F2, Plugins, Solar System Editor, Configure) and TLE of artificial satellites (via F2, Plugins, Satellite, Configure), and ask to display them at startup or not.
| A left, the comet Neowise (C/2020 F3) pictured by a member of ASA Astrosysteme on July 12, 2020 by ~23h UT. At right, the simulation with Stellarium by the author. |
You can also display the outlines of the constellations or only their name or even the drawing of the constellations. If need you can change you location via F6. These parameters are saved as your default settings (via F2). The location of your configuration files depends on your platform (cf. also the wiki).
By default, Stellarium displays the sky for the current location and time and optional for all activated data, e.g. DSO, meteor showers, and plugins like satellites, comets, asteroids, extra catalogs, etc. Thus, the default application loads much faster than a version loading tens of catalogs gathering several gigabytes of data.
If needed, you can disable these plugins via the icons displayed at the bottom of the screen or even remove extra catalogs.
At any moment, you can change the time from the panel display at the bottom left (via F5). Then, according to your needs you can use the bottom panel to select or unselect additional objects (planets, DSO, satellites, etc), track them, etc.
| At left, the Halley comet close to quasar NGC 5128 simulated by the author with Stellarium pictured (overexposed) by A.Gomes from CTIO on, April 15, 1986. At right, the simulation for April 14, 1986 at 12h UT as seen from CTIO in Chili. It is the best match that we got. We investigated the reasons for which there is a small difference of position and were unable to match at 100% with the date of the picture (took ~12 hours later). According to Stellarium developers it could be explained by the fact that we used recent orbital parameters and not those for April 1986, and also by the variable amount of dust and gas ejected by the comet that slowly modify its orbit. |
When selected (via the I key), the built-in DSO images being not saved in their highest resolution and are compressed to prevent using too much space on disk, at high zoom or magnification, their medium quality becomes apparent. So you cannot really zoom and explore the Milky Way richest star fields, HII regions or the clusters of galaxies of Coma or Virgo as if you were at the eyepiece of a scope. However, Stellarium provides a good start to prepare a possible night session.
If you plan to observe the sky through a scope, Stellarium provides a telescope view mode that simulates the field of view of your scope with the selected eyepiece or camera (but you need first select an celestial object then go to the upper right panel and select the tool). This function also supports binoculars.
This tool is also useful to check the field of view of your optical system on that celestial body before starting your session or before planning the purchase of that specific eyepiece, scope or DSLR or CCD camera.
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Simulations in the past. At left, the Great Comet simulated by the author with Stellarium for December 6, 1577. It is located in the Little Horse as displayed in Cornelius Gemma's illustration in his book 'De prodigiosa specie, naturaquae cometae' (after page 66). At right, simulation of the conjunction between Venus and Jupiter on August 12, 2 BC at 3:15 AM local time in Bethlehem in order to find a celestial event that could explain the 'Star of Bethlehem'. See other simulations in this page written in French. |
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At last, Stellarium can control the mount of a telescope thanks to the ASCOM interface. In that objective, Stellarium provides a night mode (a red screen via Ctrl+N), and in addition, you can adjust the brightness of stars. When all connections are established a pointer 'Scope' is incrusted in the current view showing where the scope is pointing.
Stellarium is available for Windows 7 and above, Mac OS X 10.12.0 and above, and Linux. It requires a computer with a 3D graphic card supporting OpenGL 3.0 and GLSL 1.3 or OpenGL ES 2.0, 512 MB RAM and at least 420 MB on disk (plus enough space for the tens of extra catalogs). The download of some catalog can last several minutes, even using a fiber optics connection at 100 Mbps (12.5 MB/s).
There is also a nice and intuitive web version : Stellarium-web.
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If you plan to observe the sky through a scope, Stellarium provides a telescope view mode that simulates the field of view of your scope with the selected eyepiece or camera (but you need first select an celestial object then go to the upper right panel and select the tool). This function also supports binoculars.
This tool is also useful to check the field of view of your optical system on that celestial body before starting your session or before planning the purchase of that specific eyepiece, scope or DSLR or CCD camera.
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Simulations in the past. At left, the Great Comet simulated by the author with Stellarium for December 6, 1577. It is located in the Little Horse as displayed in Cornelius Gemma's illustration in his book 'De prodigiosa specie, naturaquae cometae' (after page 66). At right, simulation of the conjunction between Venus and Jupiter on August 12, 2 BC at 3:15 AM local time in Bethlehem in order to find a celestial event that could explain the 'Star of Bethlehem'. See other simulations in this page written in French. |
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At last, Stellarium can control the mount of a telescope thanks to the ASCOM interface. In that objective, Stellarium provides a night mode (a red screen via Ctrl+N), and in addition, you can adjust the brightness of stars. When all connections are established a pointer 'Scope' is incrusted in the current view showing where the scope is pointing.
Stellarium is available for Windows 7 and above, Mac OS X 10.12.0 and above, and Linux. It requires a computer with a 3D graphic card supporting OpenGL 3.0 and GLSL 1.3 or OpenGL ES 2.0, 512 MB RAM and at least 420 MB on disk (plus enough space for the tens of extra catalogs). The download of some catalog can last several minutes, even using a fiber optics connection at 100 Mbps (12.5 MB/s).
There is also a nice and intuitive web version : Stellarium-web.
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A support is available on line to SourceForge.net. The Stellarium User Guide is available in HTML and in PDF format published in 2009 and 2017.
