# Celestia Add-on for Gliese 581 (alternate name Wolf 562)
# Place this file in the Celestia extras folder
# For versions of Celestia newer than 1.3 comment out the b description
# For version of Celestia 1.5 and up comment out b and C
# Gas giant radii are usually unknown and I have aproximated 581b,d from their solar analogs
# The radius of Gliese 581c and other data comes from the paper
# "The HARPS search for southern extra-solar planets : XI. An habitable super-Earth (5 
# MEarth) in a 3-planet system", by S. Udry et al.
# http://obswww.unige.ch/~udry/udry_preprint.pdf
# Update 22-04-09 Gliese 581e is now added. Information is from this paper
# http://www.exoplanets.ch/Gl581_preprint.pdf
# Orbital data for Gliese 581d is also updated

"b" "Wolf 562"
{
	#Texture "gasgiant.jpg"
	#NightTexture "gasgiantnight.jpg"
	#Uncomment these textures if you are using Celestia 1.3 or earlier
        #Comment out entire section if using Celestia 1.4 or higher

	Texture "exo-class4.*"
	NightTexture "exo-class4night.*"

	Mass       15.6     # M.sin(i) = 15.6 Earth
	Radius     25559    # Based on Uranus

	InfoURL "http://exoplanet.eu/planet.php?p1=Gl+581&p2=b"

	EllipticalOrbit {
		Period          0.0147
		SemiMajorAxis   0.041
		Eccentricity    0.02
		ArgOfPericenter 273
		MeanAnomaly     83 #use default
	}

	# likely to be in captured synchronous rotation
}

AltSurface "limit of knowledge" "Wolf 562/b"
{
	Texture "extrasolar-lok.jpg"
}
"c" "Wolf 562"
{
	Texture "ganymede.*"
	# Using Ganymede as it may be giant ice world
        # NightTexture "gasgiantnight.jpg"

	Mass       5.07     # M.sin(i) = 5.07 Earth
	Radius     9567     # 1.5 Earth radi, from paper

	InfoURL "http://exoplanet.eu/planet.php?p1=Gl+581&p2=c"

	EllipticalOrbit {
		Period          0.0354
		SemiMajorAxis   0.073
		Eccentricity    0.16
		ArgOfPericenter 267
		MeanAnomaly     83
	}

	# likely to be in captured synchronous rotation
}

AltSurface "limit of knowledge" "Wolf 562/c"
{
	Texture "ganymede.*"
	OverlayTexture "ganymede-lok-mask.png"
}
"d" "Wolf 562"
{
	#Texture "gasgiant.jpg"
	#NightTexture "gasgiantnight.jpg"
	#Uncomment these textures if using Celestia 1.3 or earlier
        

	Texture "exo-class4.*"
	NightTexture "exo-class4night.*"

	Mass       8.34     # M.sin(i) = 8.3 Earth
	Radius     24766    # Based on Neptune

	InfoURL "http://exoplanet.eu/planet.php?p1=Gl+581&p2=d"

	EllipticalOrbit {
		Period          0.18289
		SemiMajorAxis   0.22
		Eccentricity    0.38
		ArgOfPericenter 295
		MeanAnomaly     83
	}

	
}

AltSurface "limit of knowledge" "Wolf 562/d"
{
	Texture "extrasolar-lok.jpg"
}
"e" "Wolf 562"
{
	#Texture "gasgiant.jpg"
	#NightTexture "gasgiantnight.jpg"
	#Uncomment these textures if using Celestia 1.3 or earlier

	Texture "mercury.*"

	NightTexture "mercurynight.*"

	Mass       1.9     # M.sin(i) = 8.3 Earth
	Radius     12756.28    # Based on 2xEarth

	InfoURL "http://exoplanet.eu/planet.php?p1=Gl+581&p2=d"

	EllipticalOrbit {
		Period          0.008622
		SemiMajorAxis   0.03
		Eccentricity    0.0
		ArgOfPericenter 0
		MeanAnomaly     83
	}

	
}

AltSurface "limit of knowledge" "Wolf 562/e"

{
	
             Texture "mercury.*"
	
             OverlayTexture "mercury-lok-mask.png"

}