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Planetary data:
Name: Hephaestus
Orbital period in years: 0.22
Orbital period in days: 82.13
Orbital period in hours: 1971.15
Orbital radius (mean) km: 56.00E+6
Planetary diameter, km: 9340
Surface g, m/s/s: 6.89
Earth gravities: 0.70
Planetary mass, kg: 2.25E+24
Planetary mass, Earths: 0.38
Planetary volume, m^3: 426.57E+18
Planetary volume, Earths: 0.39
Approximate planetary temperature, K: 499.11
Density, g/cm^3: 5.27
Axial tilt, degrees: 11.83
Rotational period, hrs: 1473.07

Comments: Hephaestus is a mercury like planet, hot and airless, though it does have a large companion moon, Hestia, this large moon has probably prevented tidal locking to the sun, though Hephaestus' rotation is still very slow. Hephaestus also has a thin atmosphere, data of this can be seen below.



Atmospheric composition:
Pressure in millibars: 

Hydrogen (H2): trace
Helium (He): trace
Oxygen (O2): trace, monatomic
Nitrogen (N2): 0.00
Carbon dioxide (CO2): 0.00
Ammonia (NH3): 0.00
Methane (CH4): 0.00
Sulphur dioxide (SO2): 0.00
Hydrogen sulphide (H2S): 0.00
Total atmospheric pressure, bar: >0.01 bar


Atmospheric gas speed analysis
Numbers reflect escape velocity/r.m.s. speeds of molecules

Hydrogen (H2): 1.29
Helium (He): 2.58
Oxygen (O2): 20.61
Nitrogen (N2): 18.04
Carbon dioxide (CO2): 28.34
Argon (Ar): 25.77
Krypton (Kr): 54.11
Neon (Ne): 13.01
Water Vapour (H20): 10.31
Methane (CH4): 10.31
Ozone (O3): 30.92
Sulphur Dioxide (SO2): 41.22
Benzene (C6H6): 11.59
Ethane (C2H6): 19.32
Hydrogen Sulphide (H2S): 21.90
Ammonia (NH3): 10.95


Surface hydrosphere:
Potential surface liquids: 

Water (H2O): No, but found in shaded polar craters as ice
Ammonia (NH3): No
Sulphur dioxide (SO2): No, but found in shaded polar craters as ice
Carbon dioxide (CO2): No
Oxygen (O2): No
Nitrogen (N2): No
Neon (Ne): No
Deuterium (D): No
Hydrogen (H): No
Helium (He): No


Arbitrary condensation points for compounds in the formation region. numbers approaching one indicate a relatively high acquisition rate, where as higher or lower numbers indicate less abundant compounds.

TiC: 0.73
Al2O3: 0.78
C (graphite): 0.78
SiC: 0.79
CaAl2O19: 0.79
CaTiO3: 0.82
Ca2Al2O4: 0.85
MgAl2O4: 0.92
Fe3C: 0.941710
Fe: 0.94
Mg2SiO4: 0.96
AlN: 0.98
CaS: 1.016510
Mg2SiO4: 1.19
TiN: 1.35
FeS: 2.50
FeO: 2.495532
Ca2Mg5Si8O22: 2.27
H2O: 1.83
NH3: 2.56
H2SO4: 1.763627
C6H6: 1.92
CH4: 5.15
CO2: 1.64
N2: 3.961162
O2: 3.24
H2: 15.12



Detailed orbital analysis
Eccentricity, tidal effects, angular velocity

Planetary eccentricity: 0.02
Satellite eccentricity: 0.01
Planetary aphelion m km: 57.17
Planetary perihelion m km: 54.84
Satellite apoapsis km: 481556.66
Satellite periapsis km: 467810.61
Satellite angular velocity: 0.00
Planet angular velocity: 0.00
Barycentre from middle of planet, km: 6531.70
Tide height caused from moon, m: 0.06
Tide height caused from sun, m: 2.48
Tide height caused on moon from planet, m: 1.08
Planetary axial tilt, degrees: 11.83
Satellite axial tilt, degrees: 0.00
Satellite orbital inclination, degrees: 0.05
Planetary orbital inclination, degrees: 2.21

Decorative lower bar