A Couple of Worldbuilding Questions

What sort of surface would you infer from a body that has a radius of 5484 km, a mass of .14 EM, and a density of 1.268 g/cm3 (supposed to be cubed, but I don't know how to do the superscription)?

Also, how do I determine the colors of an atmosphere based on it's composition? While I'm sure most atmospheres would appear blue, what about one made of ammonia, or argon, or other gasses?

Thanks.

-M-


PS: While I appreciate the quick answer, I would also like to know where I can look so I can do the "footwork" myself...to me, it's part of the fun.

Thanks again.

Probably liquid water if above 273 K ice under 273 K but H,He ruled out too week gravity

Temp is about 200 K

-M-

...and albedo is about .15

-M-