Purple O type Giant?
This super O type Giant, can anyone tell me more about his properties?
There's no SDSS spectrum, so we can't check its type that way.
I'm sure some zooite or other is familiar enough with the colors of stars to be able to say what type it is (I am not such a zooite 😉). The SDSS DR9 Explore page for this object - 1237671262813225015 - gives its colors as: