Her name is based off this constellation: http://www.astro.wisc.edu/~dolan/co....._Austrina.html

About her:

She's a young pony, knowing how to skip and fly from galaxy to galaxy since she was a filly. She's very free spirited, loving to be off planet more than on planet. Not to mention, she believes strongly in keeping peace with creatures of other planets and galaxies, unlike some of her kind. It's rare she comes down to Equestria though, always being around the Galactic Kingdom with her friends. Corona loves the stars and many moons the galaxy has to offer, and many times, she'll go hang out on a moon or two to get away when she feels upset or needs to relax.