10-30-2010, 08:59 PM | #1 |
Join Date: May 2005
Location: Oz
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[Space] Alpha Centauri example stats
A multiple system in GURPS Handbook of Planets
I looked up Alpha Centauri in the Internet Stellar Database and fed the system age, masses, orbital separations, and eccentricities of the components into my GURPS Space 4th edition star system generator. The spectral classes and luminosities of the stars came out slightly wrong. This is partly because of the approximations used in GURPS Space's spectral class and luminosity model, partly because of uncertainties in astronomical measurements, and partly because the ISDB reports visual magnitudes whereas GURPS Space uses (or ought to use) bolometric magnitudes (which include IR and UV). I didn't worry about the discrepancy in the luminosities, but I manually reduced the mass of component A from 1.1 to 1.09, the mass of component B from 0.85 to 0.84, to get better agreement with the spectral classes. continued in the next post owing to post length limits
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 11-08-2010 at 08:21 PM. Reason: link coding |
10-30-2010, 09:01 PM | #2 |
Join Date: May 2005
Location: Oz
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Re: [Space] Alpha Centauri example stats
With Personal User Number 1, and System number 1.1, I got this system table for component A:
Code:
Name of star: Toliman A system number: 1.1 companion stars: 2 class of star: G1 V 1. mass: 0.84 periapsis: 11.42 a.u. mass: 1.09 M_ class: K0 V apapsis: 35.78 a.u. luminosity: 1.64 L_ 2. mass: 0.12 periapsis: 3530 a.u. age: 6.6 Gya. class: M7 V apapsis: 31774 a.u. diameter: 0.0114 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 0.16 small rock planet 0.86 0.51 0.69 none 476 infernal infinite 0 0 0 II 0.31 tiny rock planet 0.57 0.13 0.40 none 273 infernal infinite 0 0 0 III 0.50 standard greenhouse planet 1.1 1.1 0.95 superdense corrosive 617 infernal infinite -2 0 -2 IV 0.85 standard greenhouse planet 0.72 0.34 0.65 superdense corrosive 410 infernal 23.9 -2 -1 -3 2 moonlets 58 hot 0 0 0 V 1.2 small rock planet 0.63 0.15 0.38 none 4 chilly 17.1 0 -1 -1 2 moonlets 6 cool 0 0 0 VI 1.9 small rock planet 0.56 0.11 0.34 none -54 frozen 10.6 0 -1 -1 2 moonlets -52 frozen 0 0 0 3.2 asteroid belt -104 frozen 0 -2 -2 VII 8.7 medium gas giant 8.2 100 1.5 superdense corrosive 75.2 4 moonlets -170 frozen 0 0 0 VIIa 42 small ice moon 0.39 0.03 0.20 very dense mildly toxic 40% h'carb. -163 frozen 75.2 -1 -1 -2 VIIb 48 tiny ice moon 0.20 0.00 0.08 none -181 frozen 91.8 0 0 0 VIIc 55 tiny ice moon 0.23 0.01 0.12 none -181 frozen 114 0 0 0 VIId 63 tiny ice moon 0.26 0.01 0.13 none -181 frozen 140 0 0 0 VIIe 72 small ice moon 0.43 0.03 0.17 very dense mildly toxic 40% h'carb. -163 frozen 170 -1 1 0 Code:
Name of star: Toliman B system number: 1.2 companion stars: 2 class of star: K0 V 1. mass: 1.09 periapsis: 11.42 a.u. mass: 0.84 M_ class: G1 V apapsis: 35.78 a.u. luminosity: 0.40 L_ 2. mass: 0.12 periapsis: 3530 a.u. age: 6.6 Gya. class: M7 V apapsis: 31774 a.u. diameter: 0.0073 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) 0.15 asteroid belt 285 infernal 0 0 0 I 0.30 standard greenhouse planet 1.2 1.9 1.2 superdense corrosive 788 infernal 3108 -2 0 -2 0.51 asteroid belt 29 warm 0 1 1 II 0.81 tiny rock planet 0.14 0.00 0.11 none -35 frozen 95.7 0 0 0 III 1.4 standard ice planet 0.48 0.10 0.44 very thin suffocating -101 frozen 10.1 0 -1 -1 Code:
Name of star: Proxima system number: 1.3 companion stars: 2 class of star: M7 V 1. mass: 1.09 periapsis: 3530 a.u. mass: 0.123 M_ class: G1 V apapsis: 31774 a.u. luminosity: 0.00 L_ 2. mass: 0.84 periapsis: 3530 a.u. age: 6.6 Gya. class: K0 V apapsis: 31774 a.u. diameter: 0.0011 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 0.04 medium gas giant 10 200 2.0 superdense corrosive infinite II 0.21 small gas giant 4.5 20 0.99 superdense corrosive infinite 2 moonlets -164 frozen 0 1 1 III 0.36 small gas giant 3.9 15 1.0 superdense corrosive infinite IV 0.62 medium gas giant 8.2 100 1.5 superdense corrosive 39.1 IVa 94 tiny ice moon 0.10 0.00 0.04 none -217 frozen 259 0 0 0 1 moonlet -209 frozen 0 0 0 V 0.99 small gas giant 6.7 50 1.1 superdense corrosive 109 1 moonlet -223 frozen 0 0 0 Va 42 small hadean moon 0.31 0.01 0.15 none -238 frozen 109 0 0 0 Vb 72 tiny sulfur moon 0.21 0.00 0.08 none -233 frozen 242 -1 0 -1 VI 1.7 large gas giant 13 800 4.6 superdense corrosive 12.5 7 moonlets -234 frozen 0 0 0 VIa 131 tiny sulfur moon 0.21 0.00 0.11 none -242 frozen 147 -2 0 -2 2 moonlets -234 frozen 0 -1 -1 VII 2.7 medium gas giant 10 200 2.0 superdense corrosive 16.9 8 moonlets -243 frozen 0 0 0 VIIa 77 small hadean moon 0.21 0.00 0.11 none -252 frozen 131 0 -1 -1 VIIb 105 tiny ice moon 0.05 0.00 0.02 none -246 frozen 213 0 0 0 VIIc 138 tiny ice moon 0.16 0.00 0.08 none -246 frozen 317 0 -1 -1 1 moonlet -243 frozen 0 0 0 VIII 4.8 small gas giant 5.4 30 1.0 superdense corrosive 73.2 11 moonlets -250 frozen 0 0 0 VIIIa 28 small hadean moon 0.19 0.00 0.11 none -257 frozen 73.2 0 -1 -1 VIIIb 35 tiny sulfur moon 0.14 0.00 0.07 none -255 frozen 104 -2 0 -2 VIIIc 47 tiny ice moon 0.08 0.00 0.04 none -253 frozen 162 0 0 0
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 10-30-2010 at 09:54 PM. |
10-30-2010, 09:40 PM | #3 |
Join Date: May 2005
Location: Oz
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Re: [Space] Alpha Centauri example stats
Since Alpha Centauri worked out so dull in Universe Number One, I thought I'd run off a thousand iterations by varying the personal user number, and see whether anything interesting turned up. Six gave versions of Toliman A with more than one habitable world.
None of those turns out to correspond to a Toliman B with an inhabitable world.
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 10-31-2010 at 09:28 PM. |
10-30-2010, 09:45 PM | #4 |
Join Date: May 2005
Location: Oz
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Re: [Space] Alpha Centauri example stats
I got 27 universes (out of a thousand) with a world with affinity eight or above orbiting Alpha Centauri A:
Among those, Universe 484, 507, and 524 also have worlds with affinity above 4 orbiting Toliman B. I also found 71 universes with Affinity 7 worlds orbiting Alpha Centauri A, 66 with affinity 6 worlds, 49 with solitary affinity 5 worlds, and 34 with solitary affinity 4 worlds. Universe 280 is interesting, containing cold standard garden planet with 100% hydrographics, standard marginal atmosphere, and 0.76 gee. Habitability: 3 RVM: 2. Day: 620.3 hours. Habitability 3 isn't promising, but the resources are rich.
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 10-30-2010 at 10:31 PM. |
10-31-2010, 08:57 AM | #5 |
Join Date: May 2005
Location: Oz
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Re: [Space] Alpha Centauri example stats
1,000 examples of Alpha Centauri A was not enough excitement. I generated 10,000 examples of the whole ternary system.
Universes with more than two habitable worlds in Alpha Centauri
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 11-01-2010 at 01:06 AM. Reason: Sorting order |
10-31-2010, 08:59 AM | #6 |
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Location: Oz
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Re: [Space] Alpha Centauri example stats
Universes with more than two habitable planets in Alpha Centauri continued
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 11-01-2010 at 01:08 AM. Reason: mistakenedly counted moons as planets |
10-31-2010, 09:06 AM | #7 |
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Location: Oz
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Re: [Space] Alpha Centauri example stats
Universes in which Alpha Centauri has at least one world with an affinity above 8
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 11-01-2010 at 01:10 AM. Reason: mistakenedly counted moons as planets |
10-31-2010, 10:41 AM | #8 |
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Re: [Space] Alpha Centauri example stats
So now all we have to do is send a probe and see if you were right... :)
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10-31-2010, 09:26 PM | #9 |
Join Date: May 2005
Location: Oz
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Re: [Space] Alpha Centauri example stats
Oops! The formulas I wrote to compile those summaries had an error that made them count moons as planets. I'll mend it when I get back from the dentist.
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Decay is inherent in all composite things. Nod head. Get treat. |
11-01-2010, 01:23 AM | #10 | |
Join Date: May 2005
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Re: [Space] Alpha Centauri example stats
Quote:
Out of 10,000 iterations of the Alpha Centauri ternary system, I found 4,110 instances (41.1%) with at least one habitable world in them, a total of 4,786 habitable worlds (4,420 habitable planets and 366 habitable moons). There were even 100 systems with a habitable world orbiting Proxima! In 36 instances (0.36%) Alpha Centauri has three habitable worlds, and in 31 (0.31%) it has a bonanza planet with Affinity 9. Mind you, there are some "habitable" worlds I wouldn't be keen to live on.
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Decay is inherent in all composite things. Nod head. Get treat. Last edited by Agemegos; 11-01-2010 at 04:46 AM. |
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alpha centauri, space, system generation |
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