Re: Uncertainties effecting the planet temperature estimates, (equilibrium temperatures), and thereby, how many may, or may not be, within the habitable zone:
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The uncertainty in the computed equilibrium temperatures is approximately 22% (see Appendix) because of uncertainties in the stellar size, mass, and temperature as well as the planetary albedo. The effect of any atmosphere is an additional uncertainty.
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Appendix:
The following calculations assume that the planet radiates as a grey body; i.e., it does not have an atmosphere. The uncertainties associated with the effect of an atmosphere could dwarf the uncertainties discussed here.
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The habitable zone (HZ) is often defined to be that region around a star where a rocky planet with an Earth-like atmosphere could have a surface temperature between the freezing point and boiling point of water, or analogously the region receiving roughly the same insolation as the Earth from the Sun ...
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