I've seen that trick before. Problem is:
1- (as you said) quality doesn't reach level I am looking for
2- a planet that orbit at a realistic velocity needs so much more than 16 frames. If you set the animation speed to a low framerate, you'll only be able to see a lagged planet jumping from a frame to next one. With only 16 o even 50 frames, you should set the frame rate at high values for not to obtain a bad animation.
If you think about any kind of good solution, please, let me know