getinfo ns/desc question

[grarpamp]

getinfo ns/id/fp
 552 Unrecognized key "ns/id/39ADCFF60B1A5ED1982F1303451F4F35A7521E37"
getinfo desc/id/fp
 router kyuu 82.17.80.64 9001 0 9030
 ...

5373 BUILT ...,$7156581726CCAA0EFCFDB7F61B8FB9FE0FCD0B97~kyuu PURPOSE=GENERAL
15397 SUCCEEDED 5373
64.233.163.99.7156581726ccaa0efcfdb7f61b8fb9fe0fcd0b97.exit:80

getinfo ns/id/fp
 552 Unrecognized key "ns/id/39ADCFF60B1A5ED1982F1303451F4F35A7521E37"

Even after I map and use the exit successfully, why do I still get
the "Unrecognized key" for such nodes under tor-0.2.1.19?

And is there no way to generally tell within tor if a router
descriptor is functional without trying to pass traffic over it?
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