Satellite (66391) 1999 KW4
simulated animation of 1999 kw4 binary system
1999 kw4 has minor-planet moon orbiting it. moon, designated s/2001 (66391) 1 approximately 360 metres in diameter, , orbits primary in every 16 hours @ mean-distance of 2.6 kilometers. presence of companion suggested photometric observations made pravec , Šarounová , confirmed radar observations arecibo observations , announced on 23 may 2001 (also see below).
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