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Old 10-30-2010, 11:03 AM   #21
Flyndaran
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Default Re: [Space] GURPS Handbook of the Planets

I rarely if ever use this expression, but Oh.. My.. God!
You are one awesome man, Brett. If we wanted kids, I would ask you to impregnate my girlfriend.
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Old 10-30-2010, 11:15 AM   #22
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Default Re: [Space] GURPS Handbook of the Planets

Now to see how many habitable worlds we can get in the outer reaches of a system with this object at the inner edge of the Goldilocks Zone. I figure that we want a solitary star with a conventional arrangement of gas giants, to have the most planets and smallest eccentricities. Also, we want the system old (so that planets will have the best chance to make the Ocean->Garden transformation. And that means a low-mass, dimmish star so that it will have a long lifespan. But a star older than the Galaxy would be silly. I reckon on 10 billion years as enough. A quick experiment shows me that a mass 1.05 star will have become a subgiant at that age, but mass 1 is still okay. My designed planet will tide-lock, but that won't (officially speaking) alter its Habitability.

System sheet looks like this:
Code:
system number: 12             
class of star: G2 V                                   
mass:          1      M_                                
luminosity:    1.60   L_                              
age:           10     Gya.                              
diameter:      0.0117 a.u.   

Planets & moons
ID#     orbit radius    world type                  size  mass   grav. atmosphere              hydrograph.  temp. climate   solar day Hab. RVM  Affinity
(AU)(10,000 km)                                     (D_)  (M–)   (g.)                                       (C)             (hours)
I         0.22          small rock planet            0.84   0.41  0.59 none                                  374  infernal  infinite    0    0    0
II        0.37          tiny rock planet             0.36   0.04  0.28 none                                  228  infernal  infinite    0   -1   -1
III       0.72          large garden planet          0.95   1.0   1.1  very dense breathable   90% water       67 very hot  infinite    4    2    6
                        2 moonlets                                                                             84 infernal              0    0    0
IV        1.1           small rock planet            0.58   0.13  0.40 none                                    19 normal       40.2     0    0    0
                        1 moonlet                                                                              22 normal                0   -1   -1
          1.8           asteroid belt                                                                         -47 frozen                0    2    2
V         2.9           small rock planet            0.40   0.05  0.32 none                                   -96 frozen       18.2     0    0    0
VI        8.3           medium gas giant             8.2  100     1.5  superdense corrosive                                    48.9               
                        6 moonlets                                                                           -168 frozen                0    0    0
VIa                31   tiny ice moon                0.30   0.01  0.12 none                                  -180 frozen       48.9     0    0    0
VIb                57   tiny ice moon                0.13   0.00  0.08 none                                  -180 frozen      118       0   -1   -1
                        5 moonlets                                                                           -168 frozen                0    0    0
VII      13             small gas giant              6.7   50     1.1  superdense corrosive                                   169                 
                        12 moonlets                                                                          -190 frozen                0    0    0
VIIa               51   tiny ice moon                0.21   0.00  0.08 none                                  -199 frozen      142       0   -1   -1
VIIb               57   standard ice moon            0.49   0.10  0.39 very thin suffocating                 -183 frozen      169       0    0    0
VIIc               66   small ice moon               0.35   0.02  0.17 very dense mildly toxic 30% h'carb.   -186 frozen      211      -1    0   -1
VIId               76   standard ice moon            0.28   0.02  0.28 very thin suffocating                 -182 frozen      258       0    0    0
VIIe               88   tiny ice moon                0.26   0.01  0.11 none                                  -199 frozen      322       0    0    0
                        2 moonlets                                                                           -190 frozen                0    0    0
VIII     24             medium gas giant             8.2  100     1.5  superdense corrosive                                   259                 
                        9 moonlets                                                                           -211 frozen                0    0    0
VIIIa              73   tiny sulfur moon             0.08   0.00  0.03 none                                  -224 frozen      174      -2    0   -2
VIIIb              96   standard hadean moon         0.73   0.16  0.29 none                                  -230 frozen      259       0    0    0
VIIIc             121   tiny ice moon                0.18   0.00  0.07 none                                  -218 frozen      369       0   -1   -1
                        6 moonlets                                                                           -211 frozen                0    0    0
IX       38             small gas giant              4.5   20     0.99 superdense corrosive                                    73.2               
                        6 moonlets                                                                           -224 frozen                0    0    0
IXa                24   tiny ice moon                0.18   0.00  0.07 none                                  -230 frozen       73.2     0    0    0
So I generate a thousand systems with this set-up, and find two with three habitable planets (Systems 648 and 376) besides 251 with two habitable worlds.
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Last edited by Agemegos; 10-30-2010 at 11:26 AM.
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Old 10-30-2010, 11:23 AM   #23
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Default Re: [Space] GURPS Handbook of the Planets

The system sheet for System 648 under all those custom settings looks like this:

Code:
system number: 648            
class of star: G2 V                                   
mass:          1      M_                                
luminosity:    1.60   L_                              
age:           10     Gya.                              
diameter:      0.0117 a.u.   

Planets & moons
ID#     orbit radius    world type                  size  mass   grav. atmosphere              hydrograph.  temp. climate   solar day Hab. RVM  Affinity
(AU)(10,000 km)                                     (D_)  (M–)   (g.)                                       (C)             (hours)
          0.22          asteroid belt                                                                        371  infernal              0   -1   -1
I         0.38          tiny rock planet             0.47   0.06  0.28 none                                  221  infernal  infinite    0    0    0
II        0.72          large garden planet          0.95   1.0   1.1  very dense breathable   90% water       67 very hot  infinite    4    2    6
                        2 moonlets                                                                             84 infernal              0    0    0
III       1.0           standard garden planet       0.62   0.22  0.56 thin marginal           70% water       51 hot          32.2     5   -2    3
                        1 moonlet                                                                              27 normal                0    0    0
IV        1.6           standard garden planet       0.69   0.33  0.69 standard marginal       70% water      -17 cold         12.6     7   -1    6
                        2 moonlets                                                                            -36 frozen                0    0    0
          2.8           asteroid belt                                                                         -91 frozen                0    0    0
V         8.0           large gas giant             14    2500   14    superdense corrosive                                    23.9               
                        6 moonlets                                                                           -166 frozen                0    0    0
Va                 87   small ice moon               0.37   0.02  0.18 very dense mildly toxic 50% h'carb.   -155 frozen       44.6    -1    0   -1
Vb                103   tiny ice moon                0.30   0.01  0.15 none                                  -178 frozen       58.2     0    0    0
Vc                126   small ice moon               0.45   0.04  0.18 very dense mildly toxic 50% h'carb.   -156 frozen       78.0    -1    1    0
Vd                150   tiny ice moon                0.18   0.00  0.09 none                                  -178 frozen      102       0    0    0
                        5 moonlets                                                                           -166 frozen                0   -1   -1
VI       14             medium gas giant            11    300     2.6  superdense corrosive                                    64.3               
                        11 moonlets                                                                          -193 frozen                0    0    0
VIa                41   tiny ice moon                0.17   0.00  0.07 none                                  -202 frozen       42.3     0    0    0
VIb                47   tiny ice moon                0.27   0.01  0.08 none                                  -202 frozen       51.6     0    0    0
VIc                55   standard ice moon            0.56   0.18  0.56 thin mildly toxic                     -182 frozen       64.3    -1    0   -1
VId                62   tiny ice moon                0.27   0.01  0.08 none                                  -202 frozen       78.5     0    0    0
VIe                71   tiny ice moon                0.23   0.01  0.12 none                                  -202 frozen       95.8     0   -1   -1
                        2 moonlets                                                                           -193 frozen                0    0    0
VII      23             medium gas giant            12    450     3.2  superdense corrosive                                    40.1               
                        9 moonlets                                                                           -210 frozen                0    0    0
VIIa              118   tiny sulfur moon             0.21   0.00  0.10 none                                  -223 frozen      167      -2    1   -1
                        6 moonlets                                                                           -210 frozen                0    0    0
VIII     39             medium gas giant            10    200     2.0  superdense corrosive                                    17.0               
                        4 moonlets                                                                           -224 frozen                0    0    0
VIIIa              89   small hadean moon            0.26   0.01  0.13 none                                  -239 frozen      165       0   -2   -2
VIIIb             116   tiny sulfur moon             0.14   0.00  0.07 none                                  -234 frozen      246      -2    1   -1
VIIIc             152   small hadean moon            0.30   0.01  0.12 none                                  -239 frozen      366       0   -1   -1
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Old 10-30-2010, 11:24 AM   #24
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Default Re: [Space] GURPS Handbook of the Planets

And its planets like this:

Code:
System number:    648
Planet:           II
Planetology
class of star:    G2 V
mean distance:    0.72    AU
  perihelion:     0.72    AU
  aphelion:       0.72    AU
axial tilt:       11°
annual period:    0.610   years
                  tidelocked
local day:        infinite
                          
large garden planet
diameter:         0.95    x Earth's
                  12,118  km
density:          1.2     x Earth's
                  6.6     g/cm^3
surface gravity:  1.14    g.
                  11.2    m/s^2
escape velocity:  11.7    km/s
vulcanism :       moderate
tectonics :       moderate
climate:          very hot
temperature       
  average:        67      C
  dayside:        84      C
  nightside:      50      C
illumination:     309%    x Earth's
oceans:           90%
  composition:    water
  tidal range:    0.00    m
atmosphere        
  main gases:     N2, H2O
  traces &c.:     
  class:          breathable
  pressure:       1.7     bar  (very dense)

Sun & moons                                 apparent ...        tide induced
                  class                     size    period
       sun:       G2 V                      0.93°   infinite hr      

                                                              
Population & economy
habitability:      4
RVM:               2    resources: very abundant
affinity:          6
settlement type:  
carrying cap.:    1.1 E+9
population:       1.1 E+9     PR:  9
tech level:       10
average income:   G$ 60,300
typical wealth:   average
economic volume:  G$ 65.3 e+12
Code:
System number:    648
Planet:           III
Planetology
class of star:    G2 V
mean distance:    1.02    AU
  perihelion:     0.92    AU
  aphelion:       1.13    AU
axial tilt:       20°
annual period:    1.036   years
                  282.1   local days
local day:        32 h. 12'
                          
standard garden planet

diameter:         0.62    x Earth's
                  7,918   km
density:          0.9     x Earth's
                  5.0     g/cm^3
surface gravity:  0.56    g.
                  5.5     m/s^2
escape velocity:  6.6     km/s
vulcanism :       none
tectonics :       none
climate:          hot
temperature       
  average:        51      C
  periphelion:    68      C
  aphelion:       37      C
illumination:     153%    x Earth's
oceans:           70%
  composition:    water
  tidal range:    0.30    m
atmosphere        
  main gases:     N2, O2
  traces &c.:     low O2
  class:          marginal
  pressure:       0.67    bar  (thin)

Sun & moons                                 apparent ...        tide induced
                  class                     size    period
       sun:       G2 V                      0.65°   32.2 hr         0.30  m

                                                               
Population & economy

habitability:      5
RVM:              -2    resources: very poor
affinity:          3
settlement type:  
carrying cap.:    61.6 E+6
population:       61.6 E+6    PR:  7
tech level:       10
average income:   G$ 53,600
typical wealth:   average
economic volume:  G$ 3.3 e+12
and

Code:
System number:    648
Planet:           IV
Planetology
class of star:    G2 V
mean distance:    1.64    AU
  perihelion:     1.64    AU
  aphelion:       1.64    AU
axial tilt:       27°
annual period:    2.097   years
                  1456.2  local days
local day:        12 h. 38'
                          
standard garden planet
diameter:         0.69    x Earth's
                  8,772   km
density:          1.0     x Earth's
                  5.5     g/cm^3
surface gravity:  0.69    g.
                  6.7     m/s^2
escape velocity:  7.7     km/s
vulcanism :       none
tectonics :       none
climate:          cold
temperature       
  average:        -17     C
  periphelion:    -17     C
  aphelion:       -17     C
illumination:     60%     x Earth's
oceans:           70%
  composition:    water
  tidal range:    0.07    m
atmosphere        
  main gases:     N2, O2
  traces &c.:     high O2
  class:          marginal
  pressure:       0.83    bar  (standard)

Sun & moons                                 apparent ...        tide induced
                  class                     size    period
       sun:       G2 V                      0.41°   12.6 hr         0.07  m

                                                               
Population & economy

habitability:      7
RVM:              -1    resources: poor
affinity:          6
settlement type:  
carrying cap.:    567.5 E+6
population:       567.5 E+6   PR:  8
tech level:       10
average income:   G$ 60,300
typical wealth:   average
economic volume:  G$ 34.2 e+12
__________________

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Old 10-30-2010, 01:02 PM   #25
Flyndaran
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Default Re: [Space] GURPS Handbook of the Planets

Could someone fiddle with this to come up with a system I want? Other than Brett, you've done enough incredible wonderful work.

I want a two garden world system, in which one is a large cool to warm planet, and one is a warm to hot relatively low gravity one.
I can't seem to to reproduce Brett's results by just putting in the system and universe numbers. I know, I'm an Open Office moron.
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Old 10-30-2010, 02:57 PM   #26
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Default Re: [Space] GURPS Handbook of the Planets

Quote:
Originally Posted by Flyndaran View Post
You are one awesome man, Brett. If we wanted kids, I would ask you to impregnate my girlfriend.
Well, that's certainly an unusually flattering thing to say, but perhaps it's best if the offer remains hypothetical.

Quote:
Originally Posted by Flyndaran View Post
I want a two garden world system, in which one is a large cool to warm planet, and one is a warm to hot relatively low gravity one.
It would be easiest to design one planet and run off a few systems to find the other one you want.

Just to be clear: when you say "large" do you mean "having a diameter similar to Earth or larger" or "having significant helium in the atmosphere"?

Quote:
I can't seem to to reproduce Brett's results by just putting in the system and universe numbers. I know, I'm an Open Office moron.
Odd. Perhaps Open Office is doing something differently from the way Excel does it.
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Old 10-30-2010, 03:00 PM   #27
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Default Re: [Space] GURPS Handbook of the Planets

Quote:
Originally Posted by Brett View Post
...
It would be easiest to design one planet and run off a few systems to find the other one you want.

Just to be clear: when you say "large" do you mean "having a diameter similar to Earth or larger" or "having significant helium in the atmosphere"?

Odd. Perhaps Open Office is doing something differently from the way Excel does it.
Just a large garden planet as in larger than earth but still habitable without a ridiculously dense atmosphere.
The stars seem to match, but most of them have only ocean worlds if that.
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Old 10-30-2010, 04:38 PM   #28
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Default Re: [Space] GURPS Handbook of the Planets

Quote:
Originally Posted by Flyndaran View Post
The stars seem to match, but most of them have only ocean worlds if that.
Odd. The two possibilities that leap to mind are that you are using a previous version that you downloaded while I was testing a couple of years ago or that you have put an entry into a cell on the control panel and not blanked it. If it's neither of those, then it begins to look as though either your computer does arithmetic differently from mine and is getting different pseudorandom numbers from the same seed or as though Open Office implements some functions differently from Excel.

Try this.
  1. Download a fresh copy of the workbook.
  2. Save a backup copy somewhere safe.
  3. Open a working copy of the fresh download.
  4. On the "control panel" sheet, enter as follows:
    • Personal user number: 1
    • Use US Customary units: FALSE
    • campaign technology level: 10
    • Number of stars: 1
    • arrangement of gas giants: conventional
    • world type: standard
    • subtype: garden
    • primordial atmospheric mass: 1.5
    • hydrographic coverage: 80
    • average surface temperature: 280
    • density: 0.8
    • surface gravity: 1.12
    • orbital eccentricity: 0.01
    • obliquity: 15
    • primordial day length: 28
    • number of major moons: 0
    • number of moonlets: 1
    • resource value modifier: 0
    • vulcanism: light
    • tectonics: moderate
    Note well that if you fill in any cells in "User Specified Planet" you must fill all of them to get correct results.
  5. On the "system table" sheet, enter the number 754 into cell F4 (next to "system number").

Does the resulting system suit your requirements?

You ought to get a system table matching this:
Code:
system number: 754            
class of star: F9 V                                   
mass:          1.15   M_                                
luminosity:    2.29   L_                              
age:           5      Gya.                              
diameter:      0.0126 a.u.   

Planets & moons
ID#     orbit radius    world type                  size  mass   grav. atmosphere              hydrograph.  temp. climate   solar day Hab. RVM  Affinity
          (AU)(10,000 km)                           (D_)  (M–)   (g.)                                       (C)             (hours)
I         0.15          standard chthonian planet    1.4    2.3   1.2  none                                  575  infernal  infinite    0    0    0
II        0.30          tiny rock planet             0.61   0.18  0.49 none                                  329  infernal  2726        0    0    0
III       0.48          small rock planet            0.68   0.26  0.55 none                                  198  infernal  infinite    0    0    0
IV        0.82          small rock planet            0.61   0.18  0.49 none                                    88 infernal     36.7     0    0    0
V         1.3           standard garden planet       0.52   0.14  0.52 thin marginal           80% water       43 tropical     17.2     6    0    6
VI        1.8           standard garden planet       1.4    2.2   1.1  very dense breathable   80% water        7 cool         28.3     6    0    6
                        1 moonlet                                                                             -24 very cold             0    0    0
VII       4.0           small rock planet            0.41   0.05  0.29 none                                  -110 frozen       21.2     0   -1   -1
VIIa               15   tiny rock moon               0.07   0.00  0.04 none                                  -108 frozen      768       0   -1   -1
VIII      8.1           medium gas giant             8.2  100     1.5  superdense corrosive                                    16.3               
                        9 moonlets                                                                           -156 frozen                0    0    0
VIIIa              73   tiny ice moon                0.31   0.01  0.16 none                                  -170 frozen      174       0    0    0
VIIIb              96   tiny ice moon                0.21   0.00  0.08 none                                  -170 frozen      260       0    0    0
VIIIc             132   small ice moon               0.46   0.05  0.23 very dense mildly toxic 80% h'carb.   -148 frozen      420      -1    1    0
                        5 moonlets                                                                           -156 frozen                0    0    0
IX       14             small gas giant              3.9   15     1.0  superdense corrosive                                   169                 
                        6 moonlets                                                                           -184 frozen                0   -1   -1
IXa                38   standard ice moon            0.70   0.27  0.56 very thin suffocating                 -179 frozen      169       0    2    2
                        1 moonlet                                                                            -184 frozen                0    0    0
X        23             small gas giant              7.1   60     1.2  superdense corrosive                                    50.3               
                        4 moonlets                                                                           -204 frozen                0    0    0
Xa                 27   tiny ice moon                0.29   0.01  0.14 none                                  -212 frozen       50.3     0    0    0
Xb                 32   tiny ice moon                0.24   0.01  0.10 none                                  -212 frozen       63.6     0   -1   -1
Xc                 38   tiny ice moon                0.16   0.00  0.06 none                                  -212 frozen       82.9     0    0    0
Xd                 45   small hadean moon            0.37   0.02  0.15 none                                  -226 frozen      108       0   -1   -1
                        3 moonlets                                                                           -204 frozen                0   -1   -1
XI       40             small gas giant              2.9   10     1.2  superdense corrosive                                    49.1               
                        7 moonlets                                                                           -220 frozen                0    0    0
XIa                15   standard hadean moon         0.53   0.08  0.27 none                                  -237 frozen       49.1     0    0    0
XIb                18   small hadean moon            0.27   0.01  0.16 none                                  -237 frozen       66.0     0    0    0
XIc                21   small hadean moon            0.26   0.01  0.13 none                                  -237 frozen       83.5     0    0    0
XId                25   tiny sulfur moon             0.09   0.00  0.04 none                                  -231 frozen      109      -2    1   -1
__________________

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Last edited by Agemegos; 10-30-2010 at 05:04 PM.
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Old 10-30-2010, 04:47 PM   #29
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Default Re: [Space] GURPS Handbook of the Planets

Perfect. It must be a difference in the random numbers.
Thanks.
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Old 10-30-2010, 04:51 PM   #30
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Default Re: [Space] GURPS Handbook of the Planets

Quote:
Originally Posted by Flyndaran View Post
Perfect. It must be a difference in the random numbers.
Thanks.
No, if it's working now then it was probably the change of version or else you had modified some cell (e.g. on the control panel) and not put it back. That's easy enough to do, and it is the reason why it is important to keep an unmodified original download in a safe place and never alter it.
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