Celestia

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-- Title: Mark Local Group Galaxies
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function mark_LG_galaxies()
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--
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-- tables with the member galaxies of the Local Group
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--
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	local LG_big_galaxies = {"Milky Way", "M 31", "M 33"}
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	local LG_members = {"LMC","SMC","IC 10","NGC 6822","M 32","M 110","NGC 3109","NGC 185","IC 1613","NGC 147","Sextans A","Sextans B","WLM","Sagittarius dSph","Fornax dSph","Pegasus DIG","And VII","Leo I","Leo A","And II","And I","And VI","Sagittarius DIG","Aquarius Dwarf","Antlia Dwarf","Sculptor dSph","And III","Leo II","Cetus Dwarf","Sextans dSph","Phoenix Dwarf","LGS 3","Tucana Dwarf","Carina Dwarf","And V","UrsaMinor Dwarf","Draco Dwarf"}
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	for dso in celestia:dsos() do
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		for i,v in ipairs(LG_big_galaxies) do
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     		if dso:name() == v then
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        		dso:mark( "green", "disk",10, 1 )
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			end
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		end
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		for j,w in ipairs(LG_members) do			
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	  		if dso:name() == w then
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         		dso:mark( "red", "disk",5, 0.7 )
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	  		end
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		end
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	end
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end
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----------
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-- main -- 
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----------
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celestia:unmarkall()
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celestia:setrenderflags { markers = true }
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km2Mpc = 1/3.08568025e19
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MW = celestia:find("Milky Way")
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celestia:select(MW)
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--
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-- move observer to a distance of 5 Mpc from Milky Way
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--
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observer = celestia:getobserver()
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observer:gotodistance(MW, 5/km2Mpc,5)
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mark_LG_galaxies()
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wait(0)