Tau Ceti
12 Planets (size proportional to Sqrt(Radius))
Sun Rock Rock Venusian Rock Ice Sub-Jovian Jovian Martian Jovian Sub-Jovian Rock Rock See
Key
Stellar charactersistics
Stellar mass 0.82 solar masses
Stellar luminosity 0.59
Age 2.771 billion years
(11.128 billion left on main sequence)
Habitable ecosphere radius 0.768 AU

Planetary Overview
#TypeDist.MassRadius
1 Rock Rock 0.295 AU 0.095 EM 0.461 ER
2 Rock Rock 0.355 AU 0.009 EM 0.212 ER
3 Venusian Venusian 0.645 AU 0.974 EM 0.991 ER
4 Rock Rock 1.080 AU 0.032 EM 0.320 ER
5 Ice Ice 1.329 AU 1.105 EM 1.033 ER
6 Sub-Jovian Sub-Jovian 2.045 AU 11.005 EM 3.628 ER
7 Jovian Jovian 3.783 AU 165.155 EM 8.413 ER
8 Martian Martian 6.836 AU 0.177 EM 0.757 ER
9 Jovian Jovian 11.611 AU 329.513 EM 11.299 ER
10 Sub-Jovian Sub-Jovian 25.170 AU 6.232 EM 3.788 ER
11 Rock Rock 40.175 AU 0.423 EM 1.007 ER
12 Rock Rock 45.576 AU 0.023 EM 0.386 ER

Planet #1 Statistics
Planet typeRockRock
Tidally Locked 1 Face
Low-G, Hot, Airless, 1-Face
Distance from primary star4.4E+07 KM0.295 AU
Mass5.7E+23Kg0.095 Earth masses
Surface gravity439.6 cm/sec20.45 Earth gees
Surface pressure 0 millibars0.000 Earth atmospheres
Surface temperature160.0° Celcius
320.0° Fahrenheit		+146.0° C Earth temperature
+262.8° F Earth temperature
Normal temperature range
NightDay
-193.2° C
-315.8° F		 - 356.0° C
672.8° F
MinMax
-203.9° C
-335.1° F		 - 359.6° C
679.2° F
Equatorial radius2941.3 Km0.46 Earth radii
Density5.35 grams/cc0.97 Earth densities
Eccentricity of orbit0.061
Escape Velocity 5.1 Km/sec
Molecular weight retained204.1 and above
Axial tilt16°
Planetary albedo 0.07
Exospheric Temperature8636.49° K+7363.49° C Earth temperature
Length of year64.59 Earth days1.00 Local days
Length of day1550.28 hours
Boiling point of water-273.1° Celcius
-459.7° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.0
Ice cover percentage 0.0


Planet #2 Statistics
Planet typeRockRock
Tidally Locked 1 Face
Low-G, Hot, Airless, 1-Face
Distance from primary star5.3E+07 KM0.355 AU
Mass5.5E+22Kg0.009 Earth masses
Surface gravity201.4 cm/sec20.21 Earth gees
Surface pressure 0 millibars0.000 Earth atmospheres
Surface temperature121.8° Celcius
251.3° Fahrenheit		+107.8° C Earth temperature
+194.1° F Earth temperature
Normal temperature range
MinMax
-214.6° C
-354.3° F		 - 312.5° C
594.4° F
Equatorial radius1354.9 Km0.21 Earth radii
Density5.32 grams/cc0.96 Earth densities
Eccentricity of orbit0.047
Escape Velocity 2.3 Km/sec
Molecular weight retained668.7 and above
Axial tilt24°
Planetary albedo 0.07
Exospheric Temperature5969.78° K+4696.78° C Earth temperature
Length of year85.21 Earth days1.00 Local days
Length of day2045.00 hours
Boiling point of water-273.1° Celcius
-459.7° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.0
Ice cover percentage 0.0


Planet #3 Statistics
Planet typeVenusianVenusian
Hot, Arid, Cloudy, Unbreathably thick atmosphere
Distance from primary star9.7E+07 KM0.645 AU
Mass5.8E+24Kg0.974 Earth masses
Surface gravity971.2 cm/sec20.99 Earth gees
Surface pressure163995 millibars161.850 Earth atmospheres
Surface temperature879.6° Celcius
1615.2° Fahrenheit		+865.6° C Earth temperature
+1558.0° F Earth temperature
+810.3° C greenhouse effect (GH)
Normal temperature range
MinMax
869.5° C
1597.2° F		 - 880.7° C
1617.2° F
Equatorial radius6323.6 Km0.99 Earth radii
Density5.50 grams/cc1 Earth densities
Eccentricity of orbit0.175
Escape Velocity11.1 Km/sec
Molecular weight retained 9.0 and aboveN, O, CH4, NH3, H2O, Ne, N2, CO...
Axial tilt23°
Planetary albedo 0.52
Exospheric Temperature1802.67° K+529.67° C Earth temperature
Length of year209.18 Earth days228.82 Local days
Length of day21.94 hours
Boiling point of water325.2° Celcius
617.4° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage100.0
Ice cover percentage 0.0


Planet #4 Statistics
Planet typeRockRock
Low-G, Cold, Airless
Distance from primary star1.6E+08 KM1.080 AU
Mass1.9E+23Kg0.032 Earth masses
Surface gravity303.6 cm/sec20.31 Earth gees
Surface pressure 0 millibars0.000 Earth atmospheres
Surface temperature-46.8° Celcius
-52.2° Fahrenheit		-60.8° C Earth temperature
-109.4° F Earth temperature
+29.8° C greenhouse effect
Normal temperature range
NightDay
-81.3° C
-114.3° F		 - -12.5° C
9.5° F
MinMax
-107.4° C
-161.4° F		 - 13.5° C
56.3° F
Equatorial radius2039.2 Km0.32 Earth radii
Density5.33 grams/cc0.97 Earth densities
Eccentricity of orbit0.006
Escape Velocity 3.5 Km/sec
Molecular weight retained31.8 and aboveO2, H2S, Ar, CO2, N2O, NO2, O3, SO2...
Axial tilt16°
Planetary albedo 0.07
Exospheric Temperature643.99° K-629.01° C Earth temperature
Length of year452.68 Earth days302.39 Local days
1.24 Earth years
Length of day35.93 hours
Boiling point of water-273.1° Celcius
-459.7° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.0
Ice cover percentage 0.0


Planet #5 Statistics
Planet typeIceIce
Cold, Icy, Arid, Cloudless, Normal atmosphere
Distance from primary star2E+08 KM1.329 AU
Mass6.6E+24Kg1.105 Earth masses
Surface gravity1015.1 cm/sec21.04 Earth gees
Surface pressure 1509 millibars1.489 Earth atmospheres
Surface temperature-92.7° Celcius
-134.8° Fahrenheit		-106.7° C Earth temperature
-192.0° F Earth temperature
Normal temperature range
NightDay
-95.0° C
-139.0° F		 - -90.4° C
-130.8° F
MinMax
-112.1° C
-169.8° F		 - -74.5° C
-102.1° F
Equatorial radius6589.6 Km1 Earth radii
Density5.51 grams/cc1 Earth densities
Eccentricity of orbit0.036
Escape Velocity11.6 Km/sec
Molecular weight retained 2.0 and aboveH2, He, N, O, CH4, NH3, H2O, Ne...
Axial tilt18°
Planetary albedo 0.70
Exospheric Temperature425.37° K-847.63° C Earth temperature
Length of year617.84 Earth days982.26 Local days
1.69 Earth years
Length of day15.10 hours
Boiling point of water111.5° Celcius
232.8° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.5
Ice cover percentage100.0


Planet #6 Statistics
Planet typeSub-JovianSub-Jovian
Distance from primary star3.1E+08 KM2.045 AU
Mass6.6E+25Kg11.005 Earth masses
5.805 Earth masses dust
5.200 Earth masses gas
Equatorial radius23136.9 Km3.6 Earth radii
Density1.27 grams/cc0.23 Earth densities
Eccentricity of orbit0.047
Escape Velocity19.5 Km/sec
Molecular weight retained 0.3 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt19°
Planetary albedo 0.49
Exospheric Temperature179.61° K-1093.39° C Earth temperature
Length of year1179.48 Earth days1983.04 Local days
3.23 Earth years
Length of day14.27 hours


Planet #7 Statistics
Planet typeJovianJovian
Distance from primary star5.7E+08 KM3.783 AU
Mass9.9E+26Kg165.155 Earth masses
20.824 Earth masses dust
144.331 Earth masses gas
Equatorial radius53660.3 Km8.4 Earth radii
Density1.53 grams/cc0.28 Earth densities
Eccentricity of orbit0.096
Escape Velocity49.5 Km/sec
Molecular weight retained 0.0 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt41°
Planetary albedo 0.46
Exospheric Temperature 52.49° K-1220.51° C Earth temperature
Length of year2966.48 Earth days8330.96 Local days
8.12 Earth years
Length of day8.55 hours


Planet #8 Statistics
Planet typeMartianMartian
Low-G, Cold, Icy, Arid, Cloudless, Unbreathably thin atmosphere
Distance from primary star1E+09 KM6.836 AU
Mass1.1E+24Kg0.177 Earth masses
Surface gravity303.5 cm/sec20.31 Earth gees
Surface pressure 21 millibars0.021 Earth atmospheres
Surface temperature-185.8° Celcius
-302.4° Fahrenheit		-199.8° C Earth temperature
-359.6° F Earth temperature
Normal temperature range
NightDay
-194.7° C
-318.5° F		 - -177.0° C
-286.6° F
MinMax
-213.4° C
-352.2° F		 - -159.5° C
-255.2° F
Equatorial radius4828.4 Km0.76 Earth radii
Density2.25 grams/cc0.41 Earth densities
Eccentricity of orbit0.087
Escape Velocity 5.4 Km/sec
Molecular weight retained 0.4 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt45°
Planetary albedo 0.27
Exospheric Temperature 16.07° K-1256.93° C Earth temperature
Length of year7209.69 Earth days6289.70 Local days
19.74 Earth years
Length of day27.51 hours
Boiling point of water16.9° Celcius
62.4° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.0
Ice cover percentage21.5


Planet #9 Statistics
Planet typeJovianJovian
Distance from primary star1.7E+09 KM11.611 AU
Mass2E+27Kg329.513 Earth masses
23.764 Earth masses dust
305.749 Earth masses gas
Equatorial radius72067.0 Km11 Earth radii
Density1.26 grams/cc0.23 Earth densities
Eccentricity of orbit0.220
Escape Velocity60.4 Km/sec
Molecular weight retained 0.0 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt51°
Planetary albedo 0.51
Exospheric Temperature 5.57° K-1267.43° C Earth temperature
Length of year15948.38 Earth days47106.13 Local days
43.66 Earth years
Length of day8.13 hours


Planet #10 Statistics
Planet typeSub-JovianSub-Jovian
Distance from primary star3.8E+09 KM25.170 AU
Mass3.7E+25Kg6.232 Earth masses
1.801 Earth masses dust
4.431 Earth masses gas
Equatorial radius24161.3 Km3.8 Earth radii
Density0.63 grams/cc0.11 Earth densities
Eccentricity of orbit0.101
Escape Velocity14.3 Km/sec
Molecular weight retained 0.0 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt49°
Planetary albedo 0.48
Exospheric Temperature 1.19° K-1271.81° C Earth temperature
Length of year50935.64 Earth days61711.55 Local days
139.45 Earth years
Length of day19.81 hours


Planet #11 Statistics
Planet typeRockRock
Low-G, Cold, Airless
Distance from primary star6E+09 KM40.175 AU
Mass2.5E+24Kg0.423 Earth masses
Surface gravity409.1 cm/sec20.42 Earth gees
Surface pressure 0 millibars0.000 Earth atmospheres
Surface temperature-236.6° Celcius
-393.9° Fahrenheit		-250.6° C Earth temperature
-451.1° F Earth temperature
+4.4° C greenhouse effect
Normal temperature range
NightDay
-240.4° C
-400.7° F		 - -232.8° C
-387.0° F
MinMax
-254.2° C
-425.6° F		 - -218.9° C
-362.1° F
Equatorial radius6424.8 Km1 Earth radii
Density2.28 grams/cc0.41 Earth densities
Eccentricity of orbit0.068
Escape Velocity 7.3 Km/sec
Molecular weight retained 0.0 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt48°
Planetary albedo 0.15
Exospheric Temperature 0.47° K-1272.53° C Earth temperature
Length of year102711.23 Earth days104033.20 Local days
281.20 Earth years
Length of day23.70 hours
Boiling point of water-36.9° Celcius
-34.4° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.0
Ice cover percentage 0.1


Planet #12 Statistics
Planet typeRockRock
Low-G, Cold, Airless
Distance from primary star6.8E+09 KM45.576 AU
Mass1.4E+23Kg0.023 Earth masses
Surface gravity152.7 cm/sec20.16 Earth gees
Surface pressure 0 millibars0.000 Earth atmospheres
Surface temperature-239.1° Celcius
-398.3° Fahrenheit		-253.1° C Earth temperature
-455.5° F Earth temperature
Normal temperature range
NightDay
-244.4° C
-407.9° F		 - -233.5° C
-388.3° F
MinMax
-256.3° C
-429.4° F		 - -221.1° C
-366.1° F
Equatorial radius2459.1 Km0.39 Earth radii
Density2.22 grams/cc0.4 Earth densities
Eccentricity of orbit0.022
Escape Velocity 2.7 Km/sec
Molecular weight retained 0.0 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt53°
Planetary albedo 0.15
Exospheric Temperature 0.36° K-1272.64° C Earth temperature
Length of year124104.59 Earth days76792.82 Local days
339.77 Earth years
Length of day38.79 hours
Boiling point of water-87.4° Celcius
-125.3° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.0
Ice cover percentage 0.0


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