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SMAC: Planets of Alpha Centauri
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
Chiron
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
Atmosphere
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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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
Chiron
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
Atmosphere
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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