# This file contains the orbital elements in Celestia's SSC format.
# for Comet 81P/Wild-2
#
# The orbital information was obtained from 
# JPL's Stardust Web site at
# http://stardust.jpl.nasa.gov/comets/wildephem.html
# by Selden Ball seb+cel@lns.cornell.edu 
#
"Comet 81P/Wild 2" "Sol"
{
	Class "comet"
	Mesh "asteroid.cms"
	Texture "asteroid.jpg"
	Radius 2.0
        Albedo 0.2
	EllipticalOrbit
	{
		Period              6.38617822  # calc: (q/(1-e))**1.5
		PericenterDistance  1.58261762  
		Eccentricity        0.54022152
		Inclination         3.242623  
		AscendingNode     136.156087  
		ArgOfPericenter    41.768428  
                MeanAnomaly         0.0
		Epoch         2450575.127381  
	}
}
# http://www.bdl.fr/ephem/comets/HTML/english/CIA0008.html
"Comet 81P/Wild 2 2003" "Sol"
{
	Class "comet"
	Mesh "asteroid.cms"
	Texture "asteroid.jpg"
	Radius 2.0
        Albedo 0.2
	EllipticalOrbit
	{
		Period              6.4034958 # calc: (q/(1-e))**1.5
		PericenterDistance  1.5903645 
		Eccentricity        0.5388043
		Inclination         3.2402320
		AscendingNode     136.1418283
		ArgOfPericenter    41.7515936
                MeanAnomaly         0.0
		Epoch         2452908.440060
	}
}

"Comet 81P/Wild 2 Horizons" "Sol"
{
	Class "comet"
	Mesh "asteroid.cms"
	Texture "asteroid.jpg"
	Radius 2.0
        Albedo 0.2
	EllipticalOrbit
	{
#2453006.500000000 = A.D. 2004-Jan-02 00:00:00.0000 (CT)
# EC= 5.387138957926999E-01 QR= 1.590354611511585E+00 IN= 3.240234386643047E+00
# OM= 1.361412742242245E+02 W = 4.174880750023272E+01 Tp= 2.452908424464228E+06
# N = 1.539638183763891E-01 MA= 1.510008397676323E+01 TA= 5.371675400542490E+01
# A = 3.447653412938896E+00 AD= 5.304952214366208E+00 PR= 2.338211690229211E+03
		Period              6.40155381306502e+00  # calc: (q/(1-e))**1.5
		PericenterDistance  1.590354611511585E+00 
		Eccentricity        5.387138957926999E-01 
		Inclination         3.240234386643047E+00
		AscendingNode       1.361412742242245E+02 
		ArgOfPericenter     4.174880750023272E+01 
                MeanAnomaly         1.510008397676323E+01 
		Epoch         2453006.5
	}
}
"Comet 81P/Wild 2 Horizons2004" "Sol"
{
	Class "comet"
	Mesh "asteroid.cms"
	Texture "asteroid.jpg"
	Radius 2.0
        Albedo 0.2
	EllipticalOrbit
	{
#2453007.416666667 = A.D. 2004-Jan-02 22:00:00.0000 (CT)
#EC= 5.387116952420488E-01 QR= 1.590361582981013E+00 IN= 3.239841081463878E+00
#OM= 1.361395591134964E+02 W = 4.175001166621298E+01 Tp= 2.452908422522920E+06
#N = 1.539639077228578E-01 MA= 1.524152521291235E+01 TA= 5.412682638612866E+01
#A = 3.447652079138475E+00 AD= 5.304942575295936E+00 PR= 2.338210333346544E+03
		Period              6.401550098192912E+00 #calc
		PericenterDistance  1.590361582981013E+00
		Eccentricity        5.387116952420488E-01
		Inclination         3.239841081463878E+00
		AscendingNode       1.361395591134964E+02
		ArgOfPericenter     4.175001166621298E+01
                MeanAnomaly         1.524152521291235E+01 
		Epoch         2453007.416666667
	}
}

# orbital elements from JPL NEO site on June 25, 2004

"Comet 81P/Wild 2 NEO" "Sol"
{
	Class "comet"
	Mesh "asteroid.cms"
	Texture "asteroid.jpg"
	Radius 2.0
        Albedo 0.2
	EllipticalOrbit
	{
#Epoch = 2004-06-04 (2453160.5) TDB
#e = 0.538714109        i = 3.2398319 deg 
#q = 1.59052612 AU      w = 41.761673 deg 
#a = 3.448026812 AU  node = 136.1393814 deg 
#Q = 5.30552750 AU      M = 38.8026246 deg 
#P = 6.4027 y           n = 0.153939 deg/d 
#TP = 2003-09-25.9347486 (2452908.4347486) TDB 

		Period                6.4027
		PericenterDistance    1.59052612
		Eccentricity          0.538714109      
		Inclination           3.2398319
		AscendingNode       136.1393814
		ArgOfPericenter      41.761673
                MeanAnomaly          38.8026246
		Epoch           2453160.5
	}
}