Hey, many thanks Kird :-) !
Well, actually my question is really stupid nowadays: the position of Rosetta is now too close to 67P/Churyumov-Gerasimenko (see http://www.esa.int/Our_Activities/Space_Science/Rosetta/Rosetta_s_journey2 ), it has no sense to look for any other position than the comet's. Maybe it would have been nice to have that, when the spacecraft was not too far away from Earth, between... 2004 and 2011!
What's more, Rosetta's position is not elliptic, thus I don't know if it wouldn't be a pain for Stellarium to calculate it.
Anyway, many thanks Kird for your answer!
Sorry for my stupid question :-/ !
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