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Planetary data:
Name: Demeter
Orbital period in years: 1.37
Orbital period in days: 502.14
Orbital period in hours: 12051.27
Orbital radius (mean) km: 187.26E+6
Planetary diameter, km: 11093
Surface g, m/s/s: 8.13
Earth gravities: 0.83
Planetary mass, kg: 3.75E+24
Planetary mass, Earths: 0.63
Planetary volume, m^3: 714.70E+18
Planetary volume, Earths: 0.66
Approximate planetary temperature, K: 273.01
Density, g/cm^3: 5.25
Axial tilt, degrees: 8.81
Rotational period, hrs: 20.23

Comments: Demeter is the second life bearing planet around the sun Persephone, however it enjoys a much cooler climate than Athene, and is greatly different in every respect. Atmosphere is breathable, if rather thin, acclimatization is recommended and colony ships routinely adjust their environmental conditions accordingly to reduce the effects on arrival.

Atmospheric composition:
Pressure in millibars: 

Hydrogen (H2): trace in upper atmosphere
Helium (He): trace
Oxygen (O2): 148.03
Nitrogen (N2): 635.40
Carbon dioxide (CO2): variable according to hemisphere,  but less than 2%
Ammonia (NH3): 0.00
Methane (CH4): 0.00
Sulphur dioxide (SO2): 0.00
Hydrogen sulphide (H2S): 0.00
Total atmospheric pressure, bar: 0.78

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

Hydrogen (H2): 2.79
Helium (He): 5.58
Oxygen (O2): 44.63
Nitrogen (N2): 39.05
Carbon dioxide (CO2): 61.37
Argon (Ar): 55.79
Krypton (Kr): 117.16
Neon (Ne): 28.17
Water Vapour (H20): 22.32
Methane (CH4): 22.32
Ozone (O3): 66.95
Sulphur Dioxide (SO2): 89.27
Benzene (C6H6): 25.11
Ethane (C2H6): 41.84
Hydrogen Sulphide (H2S): 47.42
Ammonia (NH3): 23.71



Surface hydrosphere:
Potential surface liquids: 

Water (H2O): Yes as complete hydrosphere, but ice is important reservoir of total
Ammonia (NH3): Yes, but only found in solution
Sulphur dioxide (SO2): Yes, but only found in solution
Carbon dioxide (CO2): No
Oxygen (O2): No
Nitrogen (N2): No
Neon (Ne): No
Deuterium (D): No
Hydrogen (H): No
Helium (He): No


Habitable zone description: 

Planetary conditions: cool, normal ecology
Mean temperature, K: 273.01
life: assumed indigenous, but questions speculating import from athene
Atmosphere: breathable but thin
Temperature at perihelion, K: 283
Temperature at aphelion, K: 264

Decorative lower bar