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Originally Posted by Baloo
What do you mean by this?
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I was actually thinking in terms of an atom rather than a "body" to be honest. Sorry for any confusion on my part. You were clear, I just missed it.
[quote]I didn't said anything about spectrometry, solar cycle, absorption by other bodies or our capabilities to detect or not the emitted radiation. How about take one issue at a time, settle it and then proceed to the next one?
It is a simple question:
Do you agree that any body from our solar system having a temperature above 0° Kelvin is emitting photons, regardless of its chemical composition?
Yes. In the sense you meant it, the answer is yes, it is. If not for interaction with the warm universe it will eventually freeze if it continues to release it's energy.
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Note: to be fair I don't know how and if the notion of temperature applies to everything that exists in the visible universe (one possible exception that comes to my mind being a black hole). So I'll restrain the adresability of my question to the bodies existing in our solar system. 
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I had the concept of atom in my head rather than body when I first answered your question. A "body" would have more residual energy in it. Assuming it wasn't fissionable materials however, it would eventually cool to zero and stop emitting photons were it not for the presense of energy from the universe itself.
Again, I am sorry if my first answer was confusing. I didn't realize my mistake until after you responded.