celestia/extras/comets.ssc

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"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
}