HR 753 A
3 Planets (size proportional to Sqrt(Radius))
Sun Rock Ice Ice See
Key
Stellar charactersistics
Stellar mass 0.81 solar masses
Stellar luminosity 0.21
Age 5.820 billion years
(32.752 billion left on main sequence)
Habitable ecosphere radius 0.458 AU

Planetary Overview
#TypeDist.MassRadius
1 Rock Rock 0.287 AU 0.067 EM 0.410 ER
2 Ice Ice 0.514 AU 0.482 EM 0.788 ER
3 Ice Ice 1.055 AU 1.948 EM 1.241 ER

Planet #1 Statistics
Planet typeRockRock
Tidally Locked 1 Face
Low-G, Hot, Airless, 1-Face
Distance from primary star4.3E+07 KM0.287 AU
Mass4E+23Kg0.067 Earth masses
Surface gravity390.4 cm/sec20.40 Earth gees
Surface pressure 0 millibars0.000 Earth atmospheres
Surface temperature 66.0° Celcius
150.8° Fahrenheit
+52.0° C Earth temperature
+93.6° F Earth temperature
+1.4° C greenhouse effect
Normal temperature range
MinMax
-217.9° C
-360.3° F
- 241.3° C
466.3° F
Equatorial radius2615.9 Km0.41 Earth radii
Density5.34 grams/cc0.97 Earth densities
Eccentricity of orbit0.010
Escape Velocity 4.5 Km/sec
Molecular weight retained99.2 and aboveXe
Axial tilt18°
Planetary albedo 0.07
Exospheric Temperature3245.95° K+1972.95° C Earth temperature
Length of year62.39 Earth days1.00 Local days
Length of day1497.43 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 typeIceIce
Resonant Spin Locked
Low-G, Cold, Icy, Arid, Cloudless, Thin atmosphere (N2 - unbreathable), 1-Face
Distance from primary star7.7E+07 KM0.514 AU
Mass2.9E+24Kg0.482 Earth masses
Surface gravity761.9 cm/sec20.78 Earth gees
Surface pressure 291 millibars0.287 Earth atmospheres
Surface temperature-64.6° Celcius
-84.3° Fahrenheit
-78.6° C Earth temperature
-141.5° F Earth temperature
Normal temperature range
NightDay
-194.3° C
-317.7° F
- -6.5° C
20.4° F
MinMax
-211.4° C
-348.5° F
- 17.1° C
62.8° F
Equatorial radius5024.8 Km0.79 Earth radii
Density5.43 grams/cc0.98 Earth densities
Eccentricity of orbit0.162
Escape Velocity 8.8 Km/sec
Molecular weight retained 8.2 and aboveN, O, CH4, NH3, H2O, Ne, N2, CO...
Nitrogen 100.0%  291 mb (ipp: 228) 
Axial tilt28°
Planetary albedo 0.70
Exospheric Temperature1011.22° K-261.78° C Earth temperature
Length of year149.63 Earth days1.39 Local days
Length of day2590.21 hours
Boiling point of water68.7° Celcius
155.6° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.5
Ice cover percentage99.3


Planet #3 Statistics
Planet typeIceIce
High-G, Cold, Icy, Arid, Cloudless, Thick atmosphere
Distance from primary star1.6E+08 KM1.055 AU
Mass1.2E+25Kg1.948 Earth masses
Surface gravity1240.1 cm/sec21.26 Earth gees
Surface pressure 4744 millibars4.682 Earth atmospheres
Surface temperature-103.3° Celcius
-154.0° Fahrenheit
-117.3° C Earth temperature
-211.2° F Earth temperature
Normal temperature range
NightDay
-104.5° C
-156.1° F
- -102.3° C
-152.1° F
MinMax
-115.7° C
-176.2° F
- -91.8° C
-133.2° F
Equatorial radius7914.2 Km1.2 Earth radii
Density5.61 grams/cc1 Earth densities
Eccentricity of orbit0.099
Escape Velocity14.0 Km/sec
Molecular weight retained 0.8 and aboveH, H2, He, N, O, CH4, NH3, H2O...
Axial tilt29°
Planetary albedo 0.70
Exospheric Temperature240.26° K-1032.74° C Earth temperature
Length of year439.67 Earth days761.24 Local days
1.20 Earth years
Length of day13.86 hours
Boiling point of water148.3° Celcius
299.0° Fahrenheit
Hydrosphere percentage 0.0
Cloud cover percentage 0.2
Ice cover percentage100.0


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