Hi,
I read a report recently on the extrasolar planet HD 209458b, which orbits very close to its star. It seems that the planet's atmosphere is being 'blown off' by the star's solar wind and is streaming away from it like a big comet. I thought it would be fun to try to simulate this, but I hit a snag.
I thought the simplest thing to do would be to change the planet's class to a comet, so that it would then have a 'tail'. So I simply added the words Class "comet" to its details. However, this doesn't seem to work. There's no tail.
I wondered if perhaps tails don't appear when the body is too big, so I tried making Halley's comet as big as Jupiter. This worked fine - it looked ridiculous, but it successfully gave Halley a vast tail.
So why doesn't it work for HD209458b? Any theories? There may be more important things in life, but it would look very groovy...
Silly HD209458 problem
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Topic authorThe Singing Badger
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Someone did this sometime ago... I think he added a small comet class body and put it in the same orbit or something like that...
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EL XENTENARIO
1905-2005
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EL XENTENARIO
1905-2005
My page:
http://www.urielpelado.com.ar
My Gallery:
http://www.celestiaproject.net/gallery/view_al ... y-Universe
I did post in a thread an add-on that gave HD 209458 b a cometary tail. Or at least the illusion that it did.
Anyway here's a tweaked version. Loads fastest if you get the "empty.3ds" file - sorry can't remember where from...
Save this in a .ssc file in the "extras" folder e.g. I use the file name "hd209458_evaporate.ssc"
Hope that helps.
Anyway here's a tweaked version. Loads fastest if you get the "empty.3ds" file - sorry can't remember where from...
Code: Select all
"b Atmosphere Evaporation" "HD 209458" # V376 Peg
{
Class "comet"
Mesh "empty.3ds"
Radius 0.42 # to get the comet tail the right size
InfoURL "http://www2.iap.fr/exoplanetes/index_en.html"
EllipticalOrbit {
Period 0.0097
SemiMajorAxis 0.044103
Eccentricity 0
Inclination 71.7
AscendingNode 325.1
ArgOfPericenter 205
MeanAnomaly 148
}
Albedo 0
}
Save this in a .ssc file in the "extras" folder e.g. I use the file name "hd209458_evaporate.ssc"
Hope that helps.
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chaos syndrome wrote:Loads fastest if you get the "empty.3ds" file - sorry can't remember where from...
Ahem.
http://www.lns.cornell.edu/~seb/celestia/hutchison/empty.3ds
Grant
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Topic authorThe Singing Badger
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Thanks
Thanks, that looks awesome!