Tau Ceti
13 Planets (size proportional to Sqrt(Radius))
Sun Rock Rock Rock Terrestrial GasDwarf Ice Asteroids Jovian Jovian Jovian Sub-Jovian Ice Rock See
Key
Stellar charactersistics
Stellar mass 0.82 solar masses
Stellar luminosity 0.59
Age 3.935 billion years
(9.963 billion left on main sequence)
Habitable ecosphere radius 0.768 AU

Planetary Overview
#TypeDist.MassRadius
1 Rock Rock 0.303 AU 0.112 EM 0.486 ER
2 Rock Rock 0.422 AU 0.006 EM 0.184 ER
3 Rock Rock 0.585 AU 0.083 EM 0.441 ER
4 Terrestrial Terrestrial 0.827 AU 0.973 EM 0.991 ER
5 GasDwarf GasDwarf 1.516 AU 3.667 EM 1.518 ER
6 Ice Ice 2.061 AU 1.376 EM 1.109 ER
7 Asteroids Asteroids 2.309 AU 0.001 EM 0.084 ER
8 Jovian Jovian 3.985 AU 168.680 EM 8.502 ER
9 Jovian Jovian 6.667 AU 99.272 EM 7.603 ER
10 Jovian Jovian 14.781 AU 165.215 EM 9.426 ER
11 Sub-Jovian Sub-Jovian 20.573 AU 4.515 EM 3.391 ER
12 Ice Ice 39.388 AU 0.710 EM 1.192 ER
13 Rock Rock 45.475 AU 0.038 EM 0.453 ER

Planet #1 Statistics
Planet typeRockRock
Tidally Locked 1 Face
Low-G, Hot, Airless, 1-Face
Distance from primary star4.5E+07 KM0.303 AU
Mass6.7E+23Kg0.112 Earth masses
Surface gravity463.6 cm/sec20.47 Earth gees
Surface pressure 0 millibars0.000 Earth atmospheres
Surface temperature154.0° Celcius
309.3° Fahrenheit		+140.0° C Earth temperature
+252.1° F Earth temperature
Normal temperature range
NightDay
-195.3° C
-319.6° F		 - 348.7° C
659.7° F
MinMax
-206.0° C
-338.8° F		 - 352.3° C
666.1° F
Equatorial radius3098.7 Km0.49 Earth radii
Density5.35 grams/cc0.97 Earth densities
Eccentricity of orbit0.079
Escape Velocity 5.4 Km/sec
Molecular weight retained175.5 and above
Axial tilt16°
Planetary albedo 0.07
Exospheric Temperature8169.09° K+6896.09° C Earth temperature
Length of year67.35 Earth days1.00 Local days
Length of day1616.34 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
Resonant Spin Locked
Low-G, Hot, Airless, 1-Face
Distance from primary star6.3E+07 KM0.422 AU
Mass3.6E+22Kg0.006 Earth masses
Surface gravity174.1 cm/sec20.18 Earth gees
Surface pressure 0 millibars0.000 Earth atmospheres
Surface temperature 88.9° Celcius
192.0° Fahrenheit		+74.9° C Earth temperature
+134.8° F Earth temperature
Normal temperature range
NightDay
-209.3° C
-344.8° F		 - 267.3° C
513.2° F
MinMax
-219.5° C
-363.0° F		 - 271.2° C
520.2° F
Equatorial radius1172.2 Km0.18 Earth radii
Density5.32 grams/cc0.96 Earth densities
Eccentricity of orbit0.162
Escape Velocity 2.0 Km/sec
Molecular weight retained637.2 and above
Axial tilt26°
Planetary albedo 0.07
Exospheric Temperature4214.41° K+2941.41° C Earth temperature
Length of year110.64 Earth days1.39 Local days
Length of day1915.17 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 typeRockRock
Tidally Locked 1 Face
Low-G, Hot, Airless, 1-Face
Distance from primary star8.7E+07 KM0.585 AU
Mass5E+23Kg0.083 Earth masses
Surface gravity420.1 cm/sec20.43 Earth gees
Surface pressure 0 millibars0.000 Earth atmospheres
Surface temperature 34.5° Celcius
94.2° Fahrenheit		+20.5° C Earth temperature
+37.0° F Earth temperature
Normal temperature range
MinMax
-232.3° C
-386.2° F		 - 202.8° C
397.1° F
Equatorial radius2812.1 Km0.44 Earth radii
Density5.34 grams/cc0.97 Earth densities
Eccentricity of orbit0.085
Escape Velocity 4.9 Km/sec
Molecular weight retained57.4 and aboveSO2, SO3, Kr, Xe
Axial tilt24°
Planetary albedo 0.07
Exospheric Temperature2198.33° K+925.33° C Earth temperature
Length of year180.25 Earth days1.00 Local days
Length of day4326.06 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 #4 Statistics
Planet typeTerrestrialTerrestrial
Cool, Wet (N2, O2 - breathable)
Distance from primary star1.2E+08 KM0.827 AU
Mass5.8E+24Kg0.973 Earth masses
Surface gravity970.7 cm/sec20.99 Earth gees
Surface pressure 1168 millibars1.153 Earth atmospheres
Surface temperature 9.6° Celcius
49.2° Fahrenheit		-4.4° C Earth temperature
-8.0° F Earth temperature
Normal temperature range
NightDay
4.9° C
40.8° F		 - 13.9° C
57.0° F
MinMax
-18.8° C
-1.9° F		 - 36.4° C
97.4° F
Equatorial radius6320.9 Km0.99 Earth radii
Density5.50 grams/cc1 Earth densities
Eccentricity of orbit0.158
Escape Velocity11.1 Km/sec
Molecular weight retained 5.6 and aboveN, O, CH4, NH3, H2O, Ne, N2, CO...
Nitrogen 77.2%  901 mb (ipp: 853) 
Oxygen 22.1%  259 mb (ipp: 245) 
Argon  0.7%  8 mb (ipp: 7) 
Axial tilt15°
Planetary albedo 0.26
Exospheric Temperature1099.47° K-173.53° C Earth temperature
Length of year303.08 Earth days427.26 Local days
Length of day17.02 hours
Boiling point of water104.2° Celcius
219.5° Fahrenheit
Hydrosphere percentage85.7
Cloud cover percentage43.8
Ice cover percentage 3.7


Planet #5 Statistics
Planet typeGasDwarfGasDwarf
Distance from primary star2.3E+08 KM1.516 AU
Mass2.2E+25Kg3.667 Earth masses
Equatorial radius9680.7 Km1.5 Earth radii
Density5.77 grams/cc1 Earth densities
Eccentricity of orbit0.103
Escape Velocity17.4 Km/sec
Molecular weight retained 0.7 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt15°
Planetary albedo 0.42
Exospheric Temperature326.60° K-946.40° C Earth temperature
Length of year753.24 Earth days1488.66 Local days
2.06 Earth years
Length of day12.14 hours


Planet #6 Statistics
Planet typeIceIce
Cold, Icy, Arid, Cloudless, Thick atmosphere
Distance from primary star3.1E+08 KM2.061 AU
Mass8.2E+24Kg1.376 Earth masses
Surface gravity1096.3 cm/sec21.12 Earth gees
Surface pressure 2339 millibars2.309 Earth atmospheres
Surface temperature-124.2° Celcius
-191.6° Fahrenheit		-138.2° C Earth temperature
-248.8° F Earth temperature
+6.9° C greenhouse effect
Normal temperature range
NightDay
-125.7° C
-194.3° F		 - -122.8° C
-189.1° F
MinMax
-139.6° C
-219.3° F		 - -110.0° C
-166.0° F
Equatorial radius7075.3 Km1.1 Earth radii
Density5.54 grams/cc1 Earth densities
Eccentricity of orbit0.023
Escape Velocity12.5 Km/sec
Molecular weight retained 0.8 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt20°
Planetary albedo 0.70
Exospheric Temperature176.82° K-1096.18° C Earth temperature
Length of year1193.43 Earth days1978.19 Local days
3.27 Earth years
Length of day14.48 hours
Boiling point of water124.8° Celcius
256.7° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.0
Ice cover percentage100.0


Planet #7 Statistics
Planet typeAsteroidsAsteroids
Low-G, Cold, Airless
Distance from primary star3.5E+08 KM2.309 AU
Mass3.4E+21Kg0.001 Earth masses
Surface gravity79.3 cm/sec20.08 Earth gees
Surface pressure 0 millibars0.000 Earth atmospheres
Surface temperature-118.3° Celcius
-181.0° Fahrenheit		-132.3° C Earth temperature
-238.2° F Earth temperature
Normal temperature range
NightDay
-153.9° C
-245.1° F		 - -82.8° C
-117.1° F
MinMax
-174.7° C
-282.4° F		 - -61.8° C
-79.2° F
Equatorial radius534.3 Km0.084 Earth radii
Density5.31 grams/cc0.96 Earth densities
Eccentricity of orbit0.007
Escape Velocity 0.9 Km/sec
Molecular weight retained102.6 and aboveXe
Axial tilt35°
Planetary albedo 0.07
Exospheric Temperature140.87° K-1132.13° C Earth temperature
Length of year1415.30 Earth days568.44 Local days
3.87 Earth years
Length of day59.75 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 #8 Statistics
Planet typeJovianJovian
Distance from primary star6E+08 KM3.985 AU
Mass1E+27Kg168.680 Earth masses
20.245 Earth masses dust
148.435 Earth masses gas
Equatorial radius54227.3 Km8.5 Earth radii
Density1.51 grams/cc0.27 Earth densities
Eccentricity of orbit0.024
Escape Velocity49.8 Km/sec
Molecular weight retained 0.0 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt25°
Planetary albedo 0.51
Exospheric Temperature 47.29° K-1225.71° C Earth temperature
Length of year3208.12 Earth days9010.02 Local days
8.78 Earth years
Length of day8.55 hours


Planet #9 Statistics
Planet typeJovianJovian
Distance from primary star1E+09 KM6.667 AU
Mass5.9E+26Kg99.272 Earth masses
12.601 Earth masses dust
86.670 Earth masses gas
Equatorial radius48493.9 Km7.6 Earth radii
Density1.24 grams/cc0.23 Earth densities
Eccentricity of orbit0.010
Escape Velocity40.4 Km/sec
Molecular weight retained 0.0 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt37°
Planetary albedo 0.51
Exospheric Temperature 16.90° K-1256.10° C Earth temperature
Length of year6942.42 Earth days16726.21 Local days
19.01 Earth years
Length of day9.96 hours


Planet #10 Statistics
Planet typeJovianJovian
Distance from primary star2.2E+09 KM14.781 AU
Mass9.9E+26Kg165.215 Earth masses
13.788 Earth masses dust
151.428 Earth masses gas
Equatorial radius60121.1 Km9.4 Earth radii
Density1.08 grams/cc0.2 Earth densities
Eccentricity of orbit0.029
Escape Velocity46.8 Km/sec
Molecular weight retained 0.0 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt26°
Planetary albedo 0.51
Exospheric Temperature 3.44° K-1269.56° C Earth temperature
Length of year22915.85 Earth days57450.75 Local days
62.74 Earth years
Length of day9.57 hours


Planet #11 Statistics
Planet typeSub-JovianSub-Jovian
Distance from primary star3.1E+09 KM20.573 AU
Mass2.7E+25Kg4.515 Earth masses
1.612 Earth masses dust
2.902 Earth masses gas
Equatorial radius21626.8 Km3.4 Earth radii
Density0.64 grams/cc0.12 Earth densities
Eccentricity of orbit0.075
Escape Velocity12.9 Km/sec
Molecular weight retained 0.0 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt41°
Planetary albedo 0.54
Exospheric Temperature 1.77° K-1271.23° C Earth temperature
Length of year37637.66 Earth days43361.53 Local days
103.04 Earth years
Length of day20.83 hours


Planet #12 Statistics
Planet typeIceIce
Low-G, Cold, Icy, Arid, Cloudless, Thin atmosphere
Distance from primary star5.9E+09 KM39.388 AU
Mass4.2E+24Kg
0.710 Earth masses
0.515 Earth masses dust
0.196 Earth masses gas
Surface gravity490.0 cm/sec20.50 Earth gees
Surface pressure 156 millibars0.154 Earth atmospheres
Surface temperature-235.0° Celcius
-391.0° Fahrenheit		-249.0° C Earth temperature
-448.2° F Earth temperature
+1.8° C greenhouse effect
Normal temperature range
NightDay
-236.8° C
-394.3° F		 - -233.2° C
-387.8° F
MinMax
-250.6° C
-419.2° F		 - -220.3° C
-364.5° F
Equatorial radius7603.0 Km1.2 Earth radii
Density2.31 grams/cc0.42 Earth densities
Eccentricity of orbit0.075
Escape Velocity 8.6 Km/sec
Molecular weight retained 0.0 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt50°
Planetary albedo 0.24
Exospheric Temperature 0.48° K-1272.52° C Earth temperature
Length of year99709.71 Earth days110528.34 Local days
272.99 Earth years
Length of day21.65 hours
Boiling point of water54.8° Celcius
130.7° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.0
Ice cover percentage100.0


Planet #13 Statistics
Planet typeRockRock
Low-G, Cold, Airless
Distance from primary star6.8E+09 KM45.475 AU
Mass2.2E+23Kg0.038 Earth masses
Surface gravity179.5 cm/sec20.18 Earth gees
Surface pressure 0 millibars0.000 Earth atmospheres
Surface temperature-239.0° Celcius
-398.2° Fahrenheit		-253.0° C Earth temperature
-455.4° F Earth temperature
+3.9° C greenhouse effect
Normal temperature range
NightDay
-244.0° C
-407.2° F		 - -233.8° C
-388.9° F
MinMax
-258.6° C
-433.4° F		 - -218.0° C
-360.4° F
Equatorial radius2886.5 Km0.45 Earth radii
Density2.23 grams/cc0.4 Earth densities
Eccentricity of orbit0.063
Escape Velocity 3.2 Km/sec
Molecular weight retained 0.0 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt30°
Planetary albedo 0.15
Exospheric Temperature 0.36° K-1272.64° C Earth temperature
Length of year123693.94 Earth days82991.46 Local days
338.65 Earth years
Length of day35.77 hours
Boiling point of water-80.6° Celcius
-113.0° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.0
Ice cover percentage 0.0


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