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SMAC: Planets of Alpha Centauri


  • SMAC: Planets of Alpha Centauri

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    Solar constants Sun Alpha A Ratio
    Mass kg 1.99E+30 2.15E+30 1.08
    Luminosity W 3.89E+26 5.63E+26 1.45
    Radius m 6.96E+08 7.59E+08 1.09

    Planetary constants Earth Planet/ Ratio

    Mass kg 5.98E+24 1.10E+25 1.84
    Equat. radius m 6.38E+06 7.54E+06 1.18
    Dist. from star m 1.50E+11 1.60E+11 1.07
    Axial tilt degrees 23.45 2.00 0.09
    Surface area m2 5.10E+14 7.18E+14 1.41
    Standard gravity m s-2 9.81 12.85 1.31
    Escape velocity m s-1 11184 13947 1.25
    Density kg m-3 5519 6150 1.11
    Size of sun degrees 0.27 0.27 1.02
    Year our days 365.3 388.6 1.06
    Year local days 365.3 532.0 1.46
    Day hours 24.00 17.53 0.73
    Mountain height m 10626 8112 0.76
    Horizon distance m 5051 5493 1.09
    Ocean tide (sun) m 0.12 0.12 0.94
    Ocean tide (moon 1) m 0.27 0.18 0.67
    Ocean tide (moon 2) m 0.11
    Ocean tide (both) m 0.39 0.41 1.05


    Total pressure Pa 101325 176020 1.74
    Nitrogen Pa 79125 160000 2.02
    Oxygen Pa 21228 15000 0.71
    Argon Pa 942 1000 1.06
    Carbon dioxide Pa 30 20 0.67
    Nitrogen 78.09% 90.90% 1.16
    Oxygen 20.95% 8.52% 0.41
    Argon 0.93% 0.57% 0.61
    Carbon dioxide 0.03% 0.01% 0.4
    Surface density kg m-3 1.22 2.06 1.68
    "Flammability" mmol K J-1 7.17 2.87 0.40
    Effective temp. K 253 261 1.03
    Greenhouse effect K +36 +32 0.90
    Surface temp. K 288 293 1.01
    Surface temp. C 15.4 19.7 1.28
    Solar constant W m-2 1383 1750 1.27

    Moon #1 (Nessus) The Moon Nessus

    Mass kg 7.35E+22 6.50E+21 0.09
    Radius m 1.74E+06 8.00E+05 0.46
    Dist. from planet m 3.84E+08 2.00E+08 0.52
    Surface area m2 3.80E+13 8.04E+12 0.21
    Mean gravity m s-2 1.62 0.68 0.42
    Density kg m-3 3342 3031 0.91
    Synodic month our days 29.5 7.7 0.26
    Synodic month local days 29.5 10.6 0.36
    Syn. months/yr 12.4 50.2 4.05
    Angular radius degrees 0.26 0.23 0.88

    Moon #2 (Pholus) The Moon Pholus

    Mass kg 7.35E+22 5.20E+20 0.01
    Radius m 1.74E+06 3.50E+05 0.20
    Dist. from planet m 3.84E+08 1.00E+08 0.26
    Surface area m2 3.80E+13 1.54E+12 0.04
    Mean gravity m s-2 1.62 0.28 0.17
    Density kg m-3 3342 2895 0.87
    Synodic month our days 29.5 2.7 0.09
    Synodic month local days 29.5 3.7 0.13
    Syn. months/yr 12.39 143.76 11.60
    Angular radius degrees 0.26 0.20 0.77

    Eurytion (Mercurian planet) Earth Eurytion Ratio

    Mass kg 5.98E+24 5.16E+23 0.09
    Equat. radius m 6.38E+06 2.82E+06 0.44
    Dist. from star m 1.50E+11 7.06E+10 0.47
    Surface area m2 5.10E+14 9.98E+13 0.20
    Standard gravity m s-2 9.81 4.33 0.44
    Escape velocity m s-1 11184 4942 0.44
    Density kg m-3 5519 5503 1.00
    Size of sun degrees 0.27 0.62 2.31
    Year our days 365.3 113.8 0.31
    Year local days 365.3 SYNCHRONOUS
    Horizon distance m 5051 3357 0.66
    Surf. temperature K 288 438 1.52
    Surf. temperature C 15.4 165.3 10.71
    Solar constant W m-2 1383 8999 6.51
    calcium carbon lime silica
    silicate dioxide

    From Brian Reynolds of Firaxis (Message Board Post - 20 July 1998)


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