Centigrade/Kelvin symbol in LaTeX

[compilerbitch]

Does anyone here happen to know how to set a centigrade/kelvin symbol in LaTeX (raised small circle). I could hack about with math symbols to do it, but most fonts have proper glyphs for this and I'd prefer to use the real thing. Any clues? I've drawn a blank with my usual sources.

(crossposted to my own journal and other likely places on LJ)

Comments

[compilerbitch.livejournal.com]

That bit came from some fairly obscure digging I did to figure out what temperatures satellites actually are subjected to. The idea is that if you have a perfectly black (fully absorbing regardless of wavelength) thingummy with line of sight to the sun, it will reach (what was it? 7C or something?), but in shadow, it would get extremely cold. I probably need to rephrase that section.