Most of these planets have been discovered not long ago - probably I should better say "re-discovered" - from this perspective the new classification of "minor planets" established is fitting, even so the term "minor" is for sure very misleading at least when it's about the Astrological importance. 
 
As we know from many Researchers and Scientists, civilisation on Earth started far longer ago than we generally are aware of and this surfacing of awareness and consciousness is mirrored in these "discoveries".