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# Comets
"Halley:1P Halley" "Sol"
{
Class "comet"
Mesh "halley.cmod"
Texture "asteroid.jpg"
Radius 7.6 # maximum semi-axis
MeshCenter [ -0.338 1.303 0.230 ]
EllipticalOrbit
{
Epoch 2449400.5 #1994 Feb 17 00:00UT
Period 75.31589
SemiMajorAxis 17.834144
Eccentricity 0.967143
Inclination 162.262690
AscendingNode 58.420081
ArgOfPericenter 111.332485
MeanAnomaly 38.384264
}
# chaotic rotation, imperfectly defined:
# this version from "The New Solar System", 4th Edition; Eds.
# JK Beatty, CC Petersen, A Chaikin
PrecessingRotation
{
Period 170 # 7.1 day axial rotation period
Inclination 66
PrecessionPeriod 0.010 # 3.7 day precession period
}
Albedo 0.04
}
"Borrelly:19P Borrelly" "Sol"
{
Class "comet"
Mesh "borrelly.cms"
Texture "asteroid.jpg"
Radius 2.2
InfoURL "http://www.solarviews.com/eng/borrelly.htm"
EllipticalOrbit
{
Epoch 2452174.5 # 2001 Sep 22 00:00UT
Period 6.86302
SemiMajorAxis 3.611363
Eccentricity 0.623908
Inclination 30.324612
AscendingNode 75.424869
ArgOfPericenter 353.375385
MeanAnomaly 358.956091
}
UniformRotation
{
Period 25
Inclination 90
AscendingNode 315
}
Albedo 0.04
}
"Ikeya-Zhang:153P Ikeya-Zhang" "Sol"
{
Class "comet"
Texture "asteroid.jpg"
Mesh "roughsphere.cms"
EllipticalOrbit
{
Epoch 2452352.47847 # 2002 Mar 18 23:29UT
Period 367.181906
SemiMajorAxis 51.276792
Eccentricity 0.990111
Inclination 28.1206
AscendingNode 93.3718
ArgOfPericenter 34.6666
MeanAnomaly 0
}
# These are all made up (copied from Halley)
Radius 7.5
UniformRotation
{
Period 170
}
Albedo 0.04
}
"Hale-Bopp:C1995 O1 Hale-Bopp" "Sol"
{
Class "comet"
Mesh "asteroid.cms"
Texture "asteroid.jpg"
Radius 13
EllipticalOrbit
{
Period 2523.4
PericenterDistance 0.914142
Eccentricity 0.995068
Inclination 89.4300
AscendingNode 282.4707
ArgOfPericenter 130.5887
MeanAnomaly -0.007
Epoch 2450520.5
}
# Estimate of rotation period from here: http://www.usafa.af.mil/dfp/research/astro/papers/icqpaper.htm
RotationPeriod 11.47
Albedo 0.1
}
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