| dissembly | Date: Friday, 15.11.2013, 18:01 | Message # 1 |
 Observer
Group: Users
Australia
Messages: 13
Status: Offline
| Hi all,
I just downloaded this beautiful program last night and have been playing with it until 4am. I've been using the Gliese 667 C system (which is a real planetary system - Exoplanet.EU catalogue entries for GJ 667 C), because it has three planets potentially in the habitable zone and I've been thinking about what they might look like.
So I wrote the below to try and model them. I thought I'd post it up because I did something different to what the program normally does with close-in planets in the HZ of a red dwarf (i.e. it has one half of the planet iced over, and the other half shows a massive gyre at the sub-solar point). I don't have any problem with this model but I wanted to model another possibility - a super-rotating atmosphere that evenly warms the whole planet. So I made the rotation periods one day shoter than the year of the two planets GJ 667 C e & f, to prevent the iced-over model from appearing, and I gave them very fast, very high cloud decks.
The closer HZ planet ("f") I decided to make quite hot, with a high atmospheric pressure and no oceans (its oceans are up in the cloud deck and trapped in the biosphere - maybe this protects it; there was that paper recently that suggested cloud cover greater than 50% could shift a habitable zone inward quite substantially), and dark-green foliage (it has a relatively close position to the star, and so would get a lot of white light despite the redder overall spectrum). Trying to picture a steamy world that's not so far gone that it's about to tip over into a Venus-like state (but maybe in a few million years?).
The one thats further away ("e") gets less light, so I gave it black-leaved vegetation to soak up every little bit it can. I also gave it a lower atmospheric pressure and fewer clouds, but of course kept a high cloud deck and a super-rotation (to warm the nightside). This is a cooler world with a lower air pressue and deep, unevaporated oceans. I imagine it would be more pleasant to visit, even though it would look more alien with its darker, more red-dwarfy vegetation.
Neither has polar caps; ice absorbs longwave radiation better, and red dwarf stars give off more of that - there was a paper recently that suggested that snowball states are less likely around cooler stars for this reason. So I didn't allow any difference between tropics and poles. (This isn't why I didn't let them be tidally-locked, btw; of course this effect wouldn't hold for ice caps stuck permanently in the dark; I just suggest very vigorous atmospheric heat transfer to eliinate that.)
To experiment with the code I also played around with the next planet out, a super-earth, by trying to give it some evidence of a recent cataclysm (a ring-system and a series of asteroid moons). I tried to make it cratered, but I can't seem to get the hang of increasing the cratering properly... i don't have a sense of what the numbers really mean yet. 
Anyway, because these are real planets (only their details are imaginary), and weren't automatically included with the version I downloaded, I thought I'd post it up for others to see.
I put the below code straight into the pre-existing ExoPlanets.sc file - please note that the "b" and "c" planets come bundled with SpaceEngine, so be careful not to double up on them.
Code Planet "Gliese 667 C b"
{
ParentBody "Gliese 667 C"
Mass 5.6 //5.466676
Orbit
{
Epoch 2454443.1
Period 0.01971020928
SemiMajorAxis 0.0504
Eccentricity 0.13 //0.09
ArgOfPericen -4
}
}
Planet "Gliese 667 C c"
{
ParentBody "Gliese 667 C"
Mass 3.8 //4.26388
Orbit
{
Epoch 2454462
Period 0.07701738951
SemiMajorAxis 0.1251
Eccentricity 0.020 //0.34
ArgOfPericen 166
}
}
Planet "Gliese 667 C f" //added by David 15-11-2013
{
ParentBody "Gliese 667 C"
Class "Terra" // Class of a planet
Mass 2.7
Orbit
{
Epoch 2454462
Period 0.1068473648186174
RotationPeriod 912.6240000000001 // Rotation period in hours set to prevent tidal locking effects
SemiMajorAxis 0.156
Eccentricity 0.03
ArgOfPericen 103
}
Surface // Surface tag
{
BumpHeight 6.0 // Max height of landscape in km
Life true // true, if there is life on the planet
climatePole 0.7 // Climate of poles - index to color table (0...1)
climateTropic 0.7 // Climate of tropics - index to color table (0...1)
climateEquator 0.7 // Climate of equator - index to color table (0...1)
mareFreq 0.0387382 // Lunar mare frequency
mareDensity 0.06008458 // Lunar mare density
montesMagn 0.6009584 // Mountains magnitude (0...1)
montesFreq 50.9121 // Mountains frequency
montesDensity 0.108095 // Mountains density
dunesMagn 0.04444444 // Dunes magnitude (0...1)
dunesFreq 0.8876 // Dunes frequency
dunesDensity 0.5669919 // Dunes density
hillsMagn 0.1289276 // Hills magnitude (0...1)
hillsFreq 50.3618 // Hills frequency
hillsDensity 0.2554457 // Hills density
canyonMagn 0.6341905 // Canyons magnitude (0...1)
canyonFreq 263.7023 // Canyons frequency
canyonDensity 0.4370083 // Canyons density
cracksMagn 0.0 // Ice cracks magnitude (0...1)
cracksFreq 0.0 // Ice cracks frequency
cracksOctaves 0 // Number of ice cracks octaves
craterMagn 0.9358109 // Craters magnitude
craterFreq 0.0 // Craters frequency
craterDensity 0.0 // Craters density
craterOctaves 4.606928 // Number of craters octaves
craterRayedFactor 0 // Number of rayed craters relative to usual craters
colorSea (0.040, 0.100, 0.200, 1.000) // Color of seas
colorShelf (0.150, 0.480, 0.460, 1.000) // Color of shelf areas
colorBeach (0.940, 0.970, 0.737, 0.000) // Color of beach lines - milky-yellow sand
colorLowPlants (0.000, 0.000, 0.000, 0.000) // Color of lower vegetation - black
colorUpPlants (0.058, 0.145, 0.000, 0.000) // upper vegetation - dark green
}
Clouds // This is the upper Venus-like superotation
{
Height 65.0 // Height of cloud layer in km
Velocity 150000.0 // Velosity of clouds layer
Color (1.0, 1.0, 1.0) // Global color of clouds layer
Coverage 0.3 // Clouds coverage (0...1)
twistZones 1 // Number of Jupiter-like zones or strips
twistMagn 3.5 // Strength of twist
}
Ocean
{
Height 1.5
}
Atmosphere // Atmosphere tag
{
Height 100 // Height of the top boundary in km
Pressure 2.1 // Surface pressure in bars
Greenhouse 40.0 // Greenhouse effect in degrees
}
}
Planet "Gliese 667 C e" //added by David 15-11-2013
{
ParentBody "Gliese 667 C"
Mass 2.7
Orbit
{
Epoch 2454462
Period 0.170403832991102
RotationPeriod 1476 // Rotation period in hours set to prevent tidal locking effects
SemiMajorAxis 0.213
Eccentricity 0.02
ArgOfPericen 29
}
Surface // Surface tag
{
BumpHeight 10.0 // Max height of landscape in km
Life true // true, if there is life on the planet
climatePole 0.7 // Climate of poles - index to color table (0...1)
climateTropic 0.7 // Climate of tropics - index to color table (0...1)
climateEquator 0.7 // Climate of equator - index to color table (0...1)
mareFreq 0.0387382 // Lunar mare frequency
mareDensity 0.06008458 // Lunar mare density
montesMagn 0.6009584 // Mountains magnitude (0...1)
montesFreq 40.9121 // Mountains frequency
montesDensity 0.108095 // Mountains density
dunesMagn 0.04444444 // Dunes magnitude (0...1)
dunesFreq 0.8876 // Dunes frequency
dunesDensity 0.5669919 // Dunes density
hillsMagn 0.1289276 // Hills magnitude (0...1)
hillsFreq 50.3618 // Hills frequency
hillsDensity 0.2554457 // Hills density
canyonMagn 0.6341905 // Canyons magnitude (0...1)
canyonFreq 263.7023 // Canyons frequency
canyonDensity 0.4370083 // Canyons density
cracksMagn 0.0 // Ice cracks magnitude (0...1)
cracksFreq 0.0 // Ice cracks frequency
cracksOctaves 0 // Number of ice cracks octaves
craterMagn 0.9358109 // Craters magnitude
craterFreq 0.0 // Craters frequency
craterDensity 0.0 // Craters density
craterOctaves 4.606928 // Number of craters octaves
craterRayedFactor 0 // Number of rayed craters relative to usual craters
cycloneFreq 1.7607107 // Cyclones frequency
colorSea (0.040, 0.100, 0.200, 1.000) // Color of seas
colorShelf (0.150, 0.480, 0.460, 1.000) // Color of shelf areas
colorBeach (0.940, 0.970, 0.737, 0.000) // Color of beach lines - milky-yellow sand
colorLowPlants (0.000, 0.000, 0.000, 0.000) // Color of lower vegetation - black
colorUpPlants (0.000, 0.000, 0.000, 0.000) // was 0.058, 0.145, 0.000, 0.000 - dark green
}
Clouds // This is the upper Venus-like superotation
{
Height 50.0 // Height of cloud layer in km
Velocity 140000.0 // Velosity of clouds layer
Color (1.0, 1.0, 1.0) // Global color of clouds layer
Coverage 0.2 // Clouds coverage (0...1)
twistZones 10 // Number of Jupiter-like zones or strips
twistMagn 0.0 // Strength of twist
}
Ocean
{
Height 7.0
}
Atmosphere // Atmosphere tag
{
Height 90 // Height of the top boundary in km
Pressure 0.95 // Surface pressure in bars
Greenhouse 30.0 // Greenhouse effect in degrees
}
}
Planet "Gliese 667 C d" //added by David 15-11-2013
{
ParentBody "Gliese 667 C"
Mass 5.1
Orbit
{
Epoch 2454462
Period 0.2507871321013005
SemiMajorAxis 0.28
Eccentricity 0.03
ArgOfPericen 7
}
Surface // Surface tag
{
craterMagn 2.9358109 // Craters magnitude
craterFreq 184.14884 // Craters frequency
craterDensity 100.05892152 // Craters density
}
Atmosphere // Atmosphere tag
{
Model "Mars" // Model of the atmosphere
Height 90.0 // Height of the top boundary in km
Pressure 0.3 // Surface pressure in bars
Greenhouse 0.0 // Greenhouse effect in degrees
}
Rings // Ring and moon system around C d is intended to simulate recent collision that showered the planet with debris
{
// Texture parameter is commented out, becuase
// this planet use procrdural generation of texture
//Texture "Icarus-rings.*" // Rings texture
InnerRadius 23018.5 // Inner raduis of rings system in km
OuterRadius 87438.3 // Outer radius of rings system in km
RotationPeriod 43.3 // Rings rotation period in hours
RotationOffset 60.0 // Rings rotation phase in degrees
FrontBright 1.0 // Direct lighting brightness
BackBright 5.0 // Back lighting brightness (scattering)
Density 3.0 // Density (opacity)
Exposure 2.0 // Global brightness
}
}
DwarfMoon "Gliese 667 C d 1" //totally fictional
{
ParentBody "Gliese 667 C d"
Class "Asteroid"
Orbit
{
SemiMajorAxis 1.5333333333333333333333333333333e-4
Eccentricity 0.0
Inclination 0.0
}
}
DwarfMoon "Gliese 667 C d 2" //totally fictional
{
ParentBody "Gliese 667 C d"
Class "Asteroid"
Orbit
{
SemiMajorAxis 5.8666666666666666666666666666667e-4
Eccentricity 0.0
Inclination 0.0
}
}
DwarfMoon "Gliese 667 C d 3" //totally fictional
{
ParentBody "Gliese 667 C d"
Class "Asteroid"
Orbit
{
SemiMajorAxis 0.0006
Eccentricity 0.0
Inclination 0.0
}
}
DwarfMoon "Gliese 667 C d 4" //totally fictional
{
ParentBody "Gliese 667 C d"
Class "Asteroid"
Orbit
{
SemiMajorAxis 6.1333333333333333333333333333333e-4
Eccentricity 0.0
Inclination 0.0
}
}
DwarfMoon "Gliese 667 C d 5" //totally fictional
{
ParentBody "Gliese 667 C d"
Class "Asteroid"
Orbit
{
SemiMajorAxis 6.2666666666666666666666666666667e-4
Eccentricity 0.0
Inclination 0.0
}
}
Planet "Gliese 667 C g" //added by David 15-11-2013
{
ParentBody "Gliese 667 C"
Mass 5
Orbit
{
Epoch 2454462
Period 0.7014373716632444
SemiMajorAxis 0.55
Eccentricity 0.08
ArgOfPericen 52
}
}
Edited by dissembly - Friday, 15.11.2013, 18:08 |
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