Preferred Method of System Creation

[Tegmine]

I've been trying to do the ssc generator from StarGen and here's what I've been getting....

Code: Select all

Stargen - V$Revision: 1.34 $; seed=4881
                          SYSTEM  CHARACTERISTICS
Stellar mass: 1.35 solar masses
Stellar luminosity: 4.13
Age: 3.201 billion years   (0.069 billion left on main sequence)
Habitable ecosphere radius: 2.032 AU

Planets present at:
1     0.342 AU      0.034 EM   .
2     0.410 AU      0.007 EM   .
3     0.446 AU      0.043 EM   .
4     0.508 AU      0.393 EM   o
5     0.929 AU      0.540 EM   o
6     1.237 AU      1.934 EM   +
7     2.159 AU      1.573 EM   O
8     3.161 AU    540.979 EM   O
9     8.410 AU   1947.216 EM   O
10    16.213 AU      9.795 EM   O
11    27.115 AU    114.182 EM   O
12    40.598 AU      0.379 EM   O
13    48.366 AU      0.043 EM   .
14    54.271 AU      0.024 EM   .



Planet 1
Planet is tidally locked with one face to star.
   Distance from primary star:   0.342   AU
   Mass:         0.034   Earth masses
   Surface gravity:      0.32   Earth gees
   Surface pressure:      0.000   Earth atmospheres
   Surface temperature:      381.44   degrees Celcius
   Equatorial radius:      2082.1   Km
   Density:         5.329   grams/cc
   Eccentricity of orbit:   0.002
   Escape Velocity:      3.59   Km/sec
   Molecular weight retained:   2140.52 and above
   Surface acceleration:   310.07   cm/sec2
   Axial tilt:         25   degrees
   Planetary albedo:      0.070
   Length of year:      62.77   days
   Length of day:      1506.46   hours
   Boiling point of water:   -273.1   degrees Celcius
   Hydrosphere percentage:   0.00
   Cloud cover percentage:   0.00
   Ice cover percentage:   0.00


Planet 2
Planet is tidally locked with one face to star.
   Distance from primary star:   0.410   AU
   Mass:         0.007   Earth masses
   Surface gravity:      0.19   Earth gees
   Surface pressure:      0.000   Earth atmospheres
   Surface temperature:      324.11   degrees Celcius
   Equatorial radius:      1260.6   Km
   Density:         5.316   grams/cc
   Eccentricity of orbit:   0.011
   Escape Velocity:      2.17   Km/sec
   Molecular weight retained:   4055.99 and above
   Surface acceleration:   187.30   cm/sec2
   Axial tilt:         23   degrees
   Planetary albedo:      0.070
   Length of year:      82.64   days
   Length of day:      1983.24   hours
   Boiling point of water:   -273.1   degrees Celcius
   Hydrosphere percentage:   0.00
   Cloud cover percentage:   0.00
   Ice cover percentage:   0.00


Planet 3
Planet is tidally locked with one face to star.
   Distance from primary star:   0.446   AU
   Mass:         0.043   Earth masses
   Surface gravity:      0.34   Earth gees
   Surface pressure:      0.000   Earth atmospheres
   Surface temperature:      300.03   degrees Celcius
   Equatorial radius:      2262.9   Km
   Density:         5.332   grams/cc
   Eccentricity of orbit:   0.041
   Escape Velocity:      3.91   Km/sec
   Molecular weight retained:   1064.55 and above
   Surface acceleration:   337.23   cm/sec2
   Axial tilt:         12   degrees
   Planetary albedo:      0.070
   Length of year:      93.49   days
   Length of day:      2243.85   hours
   Boiling point of water:   -273.1   degrees Celcius
   Hydrosphere percentage:   0.00
   Cloud cover percentage:   0.00
   Ice cover percentage:   0.00


Planet 4
Planet is tidally locked with one face to star.
   Distance from primary star:   0.508   AU
   Mass:         0.393   Earth masses
   Surface gravity:      0.72   Earth gees
   Surface pressure:      0.000   Earth atmospheres
   Surface temperature:      263.87   degrees Celcius
   Equatorial radius:      4696.7   Km
   Density:         5.410   grams/cc
   Eccentricity of orbit:   0.010
   Escape Velocity:      8.17   Km/sec
   Molecular weight retained:   187.73 and above
   Surface acceleration:   710.14   cm/sec2
   Axial tilt:         15   degrees
   Planetary albedo:      0.070
   Length of year:      113.68   days
   Length of day:      2728.33   hours
   Boiling point of water:   -273.1   degrees Celcius
   Hydrosphere percentage:   0.00
   Cloud cover percentage:   0.00
   Ice cover percentage:   0.00


Planet 5
   Distance from primary star:   0.929   AU
   Mass:         0.540   Earth masses
   Surface gravity:      0.81   Earth gees
   Surface pressure:      0.000   Earth atmospheres
   Surface temperature:      123.73   degrees Celcius
   Equatorial radius:      5214.0   Km
   Density:         5.434   grams/cc
   Eccentricity of orbit:   0.049
   Escape Velocity:      9.09   Km/sec
   Molecular weight retained:   45.24 and above
   Surface acceleration:   791.86   cm/sec2
   Axial tilt:         20   degrees
   Planetary albedo:      0.070
   Length of year:      281.62   days
   Length of day:      20.55   hours
   Boiling point of water:   -273.1   degrees Celcius
   Hydrosphere percentage:   0.00
   Cloud cover percentage:   0.00
   Ice cover percentage:   0.00


Planet 6
   Distance from primary star:   1.237   AU
   Mass:         1.934   Earth masses
   Surface gravity:      1.26   Earth gees
   Surface pressure:      392.691   Earth atmospheres   GREENHOUSE EFFECT
   Surface temperature:      1362.49   degrees Celcius
   Equatorial radius:      7895.7   Km
   Density:         5.605   grams/cc
   Eccentricity of orbit:   0.036
   Escape Velocity:      13.98   Km/sec
   Molecular weight retained:   10.86 and above
   Surface acceleration:   1236.83   cm/sec2
   Axial tilt:         30   degrees
   Planetary albedo:      0.520
   Length of year:      432.39   days
   Length of day:      13.78   hours
   Boiling point of water:   394.3   degrees Celcius
   Hydrosphere percentage:   0.00
   Cloud cover percentage:   100.00
   Ice cover percentage:   0.00


Planet 7   *gas giant*
   Distance from primary star:   2.159   AU
   Mass:         1.573   Earth masses
   Equatorial radius:      7388.3   Km
   Density:         5.566   grams/cc
   Eccentricity of orbit:   0.019
   Escape Velocity:      13.03   Km/sec
   Molecular weight retained:   4.10 and above
   Surface acceleration:   1149.37   cm/sec2
   Axial tilt:         33   degrees
   Planetary albedo:      0.296
   Length of year:      997.50   days
   Length of day:      14.14   hours


Planet 8   *gas giant*
   Distance from primary star:   3.161   AU
   Mass:         540.979   Earth masses
   Equatorial radius:      68904.0   Km
   Density:         2.360   grams/cc
   Eccentricity of orbit:   0.003
   Escape Velocity:      79.13   Km/sec
   Molecular weight retained:   0.08 and above
   Surface acceleration:   4543.93   cm/sec2
   Axial tilt:         26   degrees
   Planetary albedo:      0.534
   Length of year:      1765.86   days
   Length of day:      6.06   hours


Planet 9   *gas giant*
   Distance from primary star:   8.410   AU
   Mass:         1947.216   Earth masses
   Equatorial radius:      108615.0   Km
   Density:         2.168   grams/cc
   Eccentricity of orbit:   0.065
   Escape Velocity:      119.58   Km/sec
   Molecular weight retained:   0.00 and above
   Surface acceleration:   6582.24   cm/sec2
   Axial tilt:         29   degrees
   Planetary albedo:      0.470
   Length of year:      7650.26   days
   Length of day:      5.04   hours


Planet 10   *gas giant*
   Distance from primary star:   16.213   AU
   Mass:         9.795   Earth masses
   Equatorial radius:      24506.1   Km
   Density:         0.950   grams/cc
   Eccentricity of orbit:   0.160
   Escape Velocity:      17.85   Km/sec
   Molecular weight retained:   0.06 and above
   Surface acceleration:   650.41   cm/sec2
   Axial tilt:         41   degrees
   Planetary albedo:      0.497
   Length of year:      20522.60   days
   Length of day:      16.03   hours


Planet 11   *gas giant*
   Distance from primary star:   27.115   AU
   Mass:         114.182   Earth masses
   Equatorial radius:      52357.3   Km
   Density:         1.135   grams/cc
   Eccentricity of orbit:   0.094
   Escape Velocity:      41.71   Km/sec
   Molecular weight retained:   0.00 and above
   Surface acceleration:   1661.04   cm/sec2
   Axial tilt:         58   degrees
   Planetary albedo:      0.497
   Length of year:      44379.22   days
   Length of day:      10.03   hours


Planet 12   *gas giant*
   Distance from primary star:   40.598   AU
   Mass:         0.379   Earth masses
   Equatorial radius:      6194.4   Km
   Density:         2.274   grams/cc
   Eccentricity of orbit:   0.061
   Escape Velocity:      6.98   Km/sec
   Molecular weight retained:   0.06 and above
   Surface acceleration:   393.60   cm/sec2
   Axial tilt:         65   degrees
   Planetary albedo:      0.150
   Length of year:      81318.18   days
   Length of day:      24.16   hours


Planet 13
   Distance from primary star:   48.366   AU
   Mass:         0.043   Earth masses
   Surface gravity:      0.19   Earth gees
   Surface pressure:      0.000   Earth atmospheres
   Surface temperature:      -219.32   degrees Celcius
   Equatorial radius:      3024.3   Km
   Density:         2.226   grams/cc
   Eccentricity of orbit:   0.004
   Escape Velocity:      3.37   Km/sec
   Molecular weight retained:   0.18 and above
   Surface acceleration:   188.18   cm/sec2
   Axial tilt:         55   degrees
   Planetary albedo:      0.150
   Length of year:      105739.20   days
   Length of day:      34.94   hours
   Boiling point of water:   -82.1   degrees Celcius
   Hydrosphere percentage:   0.00
   Cloud cover percentage:   0.00
   Ice cover percentage:   0.03


Planet 14
   Distance from primary star:   54.271   AU
   Mass:         0.024   Earth masses
   Surface gravity:      0.16   Earth gees
   Surface pressure:      0.000   Earth atmospheres
   Surface temperature:      -222.35   degrees Celcius
   Equatorial radius:      2497.4   Km
   Density:         2.222   grams/cc
   Eccentricity of orbit:   0.077
   Escape Velocity:      2.78   Km/sec
   Molecular weight retained:   0.16 and above
   Surface acceleration:   155.08   cm/sec2
   Axial tilt:         40   degrees
   Planetary albedo:      0.150
   Length of year:      125686.12   days
   Length of day:      38.48   hours
   Boiling point of water:   -90.1   degrees Celcius
   Hydrosphere percentage:   0.00
   Cloud cover percentage:   0.00
   Ice cover percentage:   0.02




Here's what I entered...

Code: Select all

stargen.exe -s# -m1.35 -i# -t >pazhan.ssc

I could never seem to get the -c command to work. What might I be doing wrong? (I'm assuming it's a problem on my end.)
Thanks.

-M-

[selden]

You are seeing exactly what you should see for the output of the -t command.
If you replace -t by -c, the output file should contain .SSC directives instead.

Did you build StarGen yourself or are you using a binary downloaded from the Web?

(I've been making some changes to my own copy of StarGen to enhance the .SSC output, but using my version would either require Cygwin under Windows or that you build StarGen from scratch in some other way.)

p.s. the #'s in your stargen command should be replaced by actual numbers.

p.p.s. The most recent version of StarGen sourcecode available from Brons is v1.47. You're using an older version (v1.34). That might be part of the problem.

[Tegmine]

ME? Build StarGen myself?!?!?!

(sometimes my own laughter is insufficient.)

In all seriousness, I don't have the skills for that sort of thing...(my true skills are with the green and the growing. )

I couldn't remember what my seed number was (hence the #).

I'll look into using the most recent version...maybe that will change things.

I had tried replacing -t with -c, but ended up with an empty .ssc...most curious.

Thanks for your help.

-M-

[selden]

Building StarGen is relatively easy (cd to the folder containing stargen, then type the command "make"), but you have to install Cygwin first, including its gcc4 components. Supposedly it can be compiled with Visual Studio, but I haven't tried that yet; maybe this evening.

It could be that the Windows binary provided on JimB's Web site is the older version. Unfortunately, the last time I communicated with him about StarGen, he indicated that his interests are elsewhere these days.

[PlutonianEmpire]

My preferred method of system creation is using a tweaked version of Rassilon's browser-based SSC generator (I did the tweaking myself). For stars similar to our sun, I click the "random" button. For significantly different suns and for moons, I have AstroSynthesis generate data, copy/paste the data into the fields on the SSC generator, and have it output the data in SSC format.

Once in a while, I may just type the SSC and STC by hand.

When it comes to textures, I simply use the textures from the texture packs provided with the Globular Cluster Generator. I have very little texture creation skills, and I'm lazy.

I E-mailed Guckytos the latest version of the SSC generator tweaks so he could host it on his site, but haven't heard back. I also sent a forum PM to Rassilon a long time ago, but never heard back.

[Tegmine]

I was recently directed to this method of texture creation (courtesy of Selden's list of links)...
http://www.solarvoyager.com/tutorials.asp?SID=750E519C10986BC514EE4E8634A54E782BF

it contains a tutorial for making earthlike and other planetary textures. It takes some time w/ GIMP or PhotoShop, but here's what I came up with recently (after some trial and error..although it was more error than trial )

Of course, there is still some work to be done to this, like seams and pinch effect, but you get the idea.

-M-