Did any shuttle astronaut indicate at what altitude they were first able to see the stars during an ascent to orbit at sunrise?
Yeagar seeing the stars in The Right Stuff. For illustration purposes only, I know its fiction. If it is not an appropriate addition to the question leave a comment (rather than downvoting) and I will remove the clip.
I thought I recalled seeing a star just after sunset (still a blue sky) at zenith during a college observatory session. An astronomy SE discussion indicates that is possible. So if an astronaut was at a window on the shadow side of a vehicle during ascent, at sunrise it seems reasonable to assume that astronaut could have seen stars.