PLANETS OF ALPHA CENTAURI A =========================== 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