Same for me. It glows when its "night time" in the game but not during the day. I just figured it was ment that way.
At first i thought it was a bug because it happened after i went to Eva to try out different shaders. Later i noticed the night/day thing.
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That's what I thought initially, but then I noticed I'd be just floating in orbit and it would still happen occasionally. As far as I know, there's no "day/night" cycle in orbit. (Btw if you look at the screenshots I provided in the other comment to Bungie, they are both during the day.) That's what led me to throw that theory out the window.
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it has more to do with light/dark places, for example in aksis his room or the crota raid it lights up, yet if i stand outside the entrance of crotas raid on the moon its gold.