# 87 Sylvia, using Ida as template.
# additional Sylvia info http://en.wikipedia.org/wiki/87_Sylvia
# http://www.johnstonsarchive.net/astro/astmoons/am-00087.html

"Sylvia" "Sol"
{
	Class "asteroid"
	Mesh "ida.cmod"
	#Texture "asteroid.jpg"
	Texture "idamosaic.*" # Phil Stooke
	Radius 143

	EllipticalOrbit
	{
	Epoch	  2453249.5        # 2005 Aug 
	Period          6.5207     # mean
	SemiMajorAxis   3.49026    # at epoch
	Eccentricity    0.079662   # at epoch
	Inclination     10.8561    # at epoch
	AscendingNode   73.3302    # at epoch
	ArgOfPericenter 266.048    # at epoch
        MeanAnomaly     352.763    # at epoch
	}

	Orientation          [ 180 1 0 0 ] # retrograde rotation
	RotationPeriod         5.18365
	Obliquity	     156.96 # pinched from Ida
	EquatorAscendingNode 352.77
	RotationOffset       179.46

	Albedo 0.0435
}

"Romulus" "Sol/Sylvia"
{
	# Data for Romulus taken from: 
	# Marchis, F.et al'; 2005, Nature, 436:822-824, 
	# Discovery of the triple asteroidal system 87 Sylvia.

	InfoURL "http://www.nature.com/nature/journal/v436/n7052/fig_tab/nature04018_T1.html"

	Class "asteroid"
	Texture "asteroid.jpg"
	Mesh "roughsphere.cms"
	Radius   9.0

	EllipticalOrbit
	{
	Epoch	     2453249.5     # 2001
	Period             3.6496  # 
	SemiMajorAxis   1356.0     # 
	Eccentricity       0.001   # 
	LongOfPericenter 14.0      # 
	AscendingNode     101      # 
                                   # 
	Inclination      1.7       # 
	}

	RotationOffset   123       # place prime meridian facing Ida

	Albedo 0.2
}

"Remus" "Sol/Sylvia"
{
	# Data for Remus taken from: 
	# Marchis, F.et al'; 2005, Nature, 436:822-824, 
	# Discovery of the triple asteroidal system 87 Sylvia.

	InfoURL "http://www.nature.com/nature/journal/v436/n7052/fig_tab/nature04018_T1.html"
	
	Class "asteroid"
	Texture "asteroid.jpg"
	Mesh "roughsphere.cms"
	Radius   3.5

	EllipticalOrbit
	{
	Epoch	     2453246.5     # 2004
	Period             1.3788  # 
	SemiMajorAxis    706       # 
	Eccentricity       0.016   # 
	LongOfPericenter  51       # 
	AscendingNode     97       # 
                                   # 
	Inclination        2.0       # 
	}

	RotationOffset   123       # place prime meridian facing Sylvia

	Albedo 0.2
}