I noticed that planets that show up in the System Map with a distinct orange hue actually appear as greyish / blueish planets when you approach them. As far as I've seen, this only applies to landfall planets. Planets that cannot be landed on that show in the System Map with an orange hue, actually are orange when you approach them.
As far as I can tell, this is not influenced by the star type; it happens for any type of star from M-class to Neutron star.
As per System Map:

Actual planet:

Bug (possibly the System Map uses an erroneous shader) or works as intended?
EDIT: And here a truly orange example, with atmosphere:


As far as I can tell, this is not influenced by the star type; it happens for any type of star from M-class to Neutron star.
As per System Map:

Actual planet:

Bug (possibly the System Map uses an erroneous shader) or works as intended?
EDIT: And here a truly orange example, with atmosphere:


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