Name: Cancer. I know you aren't asking why for names but I thought I'd tell you why (if you'd like me to remove this I will). I chose to name this Lumie Cancer because she was made in the Cancer month, I did NOT name her Cancer because of the disease. But anyways, I chose the name Cancer also because Cancer is an astrological sign for the month of July. I know her design is based around astronomy and not around astrology but I still found this a bit fitting. Astrology and Astronomy are kind of based around the same thing (stars and planets) but Astrology is just the belief that the positioning of stars and planets affect everyday life. But, anyways, I named her Cancer because she was created in the month of July and this month has the sign of Cancer.
Favorite constellation and why: I like a lot of constellations but my favorite would have to Cancer. Now, I don't say this because her name is Cancer and I'm just going along with her name. I say this because I was born in the cancer month (July). I also like it because I love crabs and it's translation is Crab. I also like it because it has a neat story.
The Crab, Cancer, played a minor role in the Twelve Labors of Hercules. The Goddess Hera -- who disliked Hercules -- sent the Crab to distract Hercules, who at the time was fighting the multi-headed monster, Hydra. The Crab - Cancer - ended up grabbing onto Hercules's toe with its claws but it didn't break the rhythm (at all) of Hercules's battle with Hydra. The hero, Hercules, ended up crushing the Crab with his foot. Though Hera was grateful for the Crab's heroic yet rather pathetic effort to distract Hercules. So, to award the Crab's death, she gave Cancer a place in the sky.
Extra: I may get a piece of art of this Lumie and I'll add it here if I do. Also, I love her/him!