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    I don't think I understand the question - we discovered the color/appearance of each planet when we discovered the planet - this is well documented in any basic reference source. The visible planets have been known since antiquity (hence "visible planets"). What is it you want to know that is beyond a simple google search> (Not trying to insult, trying to make sure we're answering the right question.) Commented Jul 5, 2018 at 13:58
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    @MarkC.Wallace We usually discovered them as tiny moving dots, or a few pixels. To counter that, here's what Pluto looked like when it was discovered in 1930 and here's the best we had from Hubble until New Horizons. (And no, I don't want to argue whether Pluto is a planet. I'm using it as a convenient example.) Commented Jul 5, 2018 at 18:28