Tidally locked gas giant moon - brightness of the gas giant

Imagine a tidally locked gas giant moon, which is otherwise earth-like. One side of the moon will have a huge planet constantly hovering in the sky (24 hour day/night cycle with a Jupiter-sized primary works out to about 30° angular diameter)

Questions:

1. Will the "Jupiter" be always fully visible during daytime? Will there be phases?
2. How bright will it be during nighttime? Will there even be a proper dark night outside of solar eclipses?
3. Does it depend on the exact location of the observer on the planet-facing side? (I.e. is it significantly brighter when the gas giant is directly overhead compared to low above horizon?)

posted over 9 years ago

Korvas‭

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