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How long after sunset? Only a few hours I think. I'm not surprised. Check out Heavens Above and see how many objects still do catch the sun well after sunset and well before sunrise. I recall the International Space Station traversing much of the sky before entering shadow and this was quite a dark sky - some hours after sunset and it is in a relatively low orbit if I recall correctly. Also, objects passing in more polar orbits are obviously going to hit sunlight as they head towards the SCP.
Your "lost sight of it" might have been it passing into the earth's shadow?
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