I had some fun putting this together, see what you think. Sorry about the cut-and-paste, I don't have a website for downloading add-ons. Paste this into a SSC file and put it in your Extras folder. I have a small text file describing how I arrived at these numbers - I'd love to have a real scientist check my reasoning (and my math!). I'll email it to whoever wants it, or post it here if you think that's appropriate. Thanks.
BillC
# HD 41004
# A quadruple system: a jupiter-like planet orbits a K2V star,
# which is bound to a M4V star and brown dwarf pair.
# The K star, HD 41004, is designated Aa; its planet is Ab:
"Ab" "HD 41004"
{
Texture "jupiterlike.jpg"
Mass 730
Radius 67000
Oblateness 0.05 # guess
Albedo 0.6 # guess
InfoURL "http://www.obspm.fr/encycl/HD41004A.html"
EllipticalOrbit {
Period 1.793
SemiMajorAxis 1.31
Eccentricity 0.39
Inclination 69.3
AscendingNode 180
MeanAnomaly 60 # guess
}
Obliquity -69.3
}
# The M companion star:
"Ba" "HD 41004"
{
Texture "mstar.jpg"
Radius 271000 # 0.39 rSun
Emissive true
Color [ 1 0.5 0.5 ]
Oblateness 0.03 # guess
InfoURL "http://aanda.u-strasbg.fr:2002/articles/aa/full/2003/23/aa3454/aa3454.html"
EllipticalOrbit {
Period 107.2
SemiMajorAxis 23.29 # minimum
Eccentricity 0.01 # guess
Inclination 69.3
AscendingNode 180
MeanAnomaly 170 # guess
}
RotationPeriod 240 # guess
Obliquity -69.3
Atmosphere {
Height 200000
Lower [ 1 0.5 0.5 ]
Upper [ 1 1 1 ]
}
}
# The brown dwarf:
"Bb" "HD 41004/Ba"
{
Texture "browndwarf.jpg"
Radius 70000 # guess
Color [ 0.4 0.4 0 ]
Emissive true
Oblateness 0.08 # guess
EllipticalOrbit {
Period 1.33
SemiMajorAxis 2650000 # 0.0177 AU
Eccentricity 0.065
}
RotationPeriod 31.9 # guess
}