The average separation of the two components is 15.0 AU , a little less than the distance between Uranus and the Sun , though the eccentric orbit carries them as close as 8.9 AU and as far as 21.0 AU .
DET ADJ NOUN ADP DET NUM NOUN AUX NUM PROPN , DET ADJ ADJ SCONJ DET NOUN ADP PROPN CCONJ DET PROPN , SCONJ DET ADJ NOUN VERB PRON ADV ADJ ADP NUM PROPN CCONJ ADV ADV ADP NUM PROPN .