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Research results in no reliable information regarding the self-luminosity of any planet in the solar system. Planets do not emit light, they reflect it. If any one of the planets were capable of emitting light, it would most likely be Jupiter which is a bit of a failed star, however there seems to be no data indicating that Jupiter does more than reflect the light of the sun.

Edit: Yes, it's not easy to think what this question is getting at. There's the faint "ashen light" sometimes seen on Venus.

Of course the Earth is slightly luminous because of human activity.

But what I think is the most likely answer is "Jupiter". That planet

emits more energy than it could by just reflecting sunlight. Of course that's total energy including all radiation wavelengths, not just the optical waveband.

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