stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.
It is being used in planetarium projectors. Just set your coordinates and go.
Stellarium creates fairly realistic views of the sky. The basic program has over 600,000 stars (roughly up to magnitude 9.9) with another 240 million available as an add on. This is the only free program that shows constellation groupings for other cultures. I loved the zoom in ability which would show actual images of planets and some deep space objects. I even located and zoomed in on an image of Saturn's moon Titan as well as the asteroid Ceres.
Stellarium provides many visual effects, including the Milky Way, twinkling stars, shooting stars, clouds, and light pollution. Several landscapes are included.
The telescope control plug in allows Stellarium to control a computerized telescope. The Satellites plug in calculates and renders satellites in Earth orbit from NORAD/TLE data.
I couldn't find the Comet 10P/Tempel 2 in Stellarium. It's catalog did seem a little weak in comets.
Download Stellarium
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