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The planet is about 1.25 AU from its sun and the Moon's orbital radius is about 0.01 AU (assuming 1AU=149Gm). Thus the moon's radius does not make a difference in the levels of incoming radiation, contradicting my previous assumption.

The planet is about 1.25 AU from its sun and the Moon's orbital radius is about 0.01 AU (assuming 1AU=149Gm). Thus the moon's orbit does not make a difference (1%) in the levels of incoming radiation, contradicting my previous assumption.

The planet is about 1.25 AU from its sun and the orbit of the moon comprises about 0.01 AU (assuming 1AU=149Gm) in radius. Thus the moon's radius does not make a difference in the levels of incoming radiation, contradicting my previous assumption.

Using this graph of sun's energy per distance, we can conclude that at 1.25 AU the incoming energy level dropped by about a quarter or 25%.

Given your assumption that the atmosphere will be sufficient to support life on the moon, we could assume that it is of similar composition as that of our Earth. Earth's average atmospheric temperature is about 15°C.

According to this graph of temperature ranges during the seasons the ranges for the Planet and Moon can be derived by lowering the values by 25% (Earth for reference):

The planet is about 1.25 AU from its sun and the Moon's orbital radius is about 0.01 AU (assuming 1AU=149Gm). Thus the moon's radius does not make a difference in the levels of incoming radiation, contradicting my previous assumption.

Using this graph of sun's energy per distance, we can conclude that at 1.25 AU the incoming energy level dropped by about a quarter or 25% (inverse square law), which turns out to be very significant.

Given your assumption that the atmosphere will be sufficient to support life on the Moon, we could assume that it is of similar composition as that of our Earth. Earth's average atmospheric temperature is about 15°C.

According to this graph of temperature ranges during the seasons the ranges for the Planet and Moon can be approximated by lowering Earth's values by 25%:

However, there is a fairly huge difference between moon's sun-close-distance and sun-far-distance.

I did not find data to compare here. So I will not dig into that detail further to find out about real temperature margins.

There are orbital season phases though, which are passed through almost four times in a planet-year. During those near-sun/far-sun phases a considerable difference in temperature can be expected. If this is strong enough to impact habitability is open to speculation.

Using this graph of sun's energy per distance, we can conclude that at 1.4 AU the incoming energy level dropped by about a quarter or 25%.

Given your assumption that the atmosphere will be sufficient to support life on the moon, we could assume that it is of similar composition as that of our earth. Earth's average atmospheric temperature is about 15°C.

According to this graph of temperature ranges during the seasons the ranges for the Moon can be derived by lowering the values by 25% (Earth for reference):

However, there is a fairly huge difference between moon's sun-close-distance and sun-far-distance. (->which turns out to be in the range of 1%; see Edit below for details on temperature)

There are orbital season phases though, which are passed through almost four times in a planet-year.

On average the planet receives 25% less sun energy because of the increased distance to 1.25 AU (moves it halfway between our Earth and Mars, for reference). However, the Moon's orbit makes almost no difference at that distance (influence about 1%).

Using this graph of sun's energy per distance, we can conclude that at 1.25 AU the incoming energy level dropped by about a quarter or 25%.

Given your assumption that the atmosphere will be sufficient to support life on the moon, we could assume that it is of similar composition as that of our Earth. Earth's average atmospheric temperature is about 15°C.

According to this graph of temperature ranges during the seasons the ranges for the Planet and Moon can be derived by lowering the values by 25% (Earth for reference):