, ▁the ▁rotation ▁period ▁of ▁ ▁is ▁likely ▁at ▁most ▁about ▁ 2 . 8 ▁hours . ▁ ▁Sat ellite ▁▁ ▁The ▁satellite ▁of ▁ ▁was ▁discovered ▁in ▁A reci bo ▁rad ar ▁observations ▁conducted ▁by ▁a ▁team ▁of ▁astronom ers ▁consisting ▁of ▁Lu isa ▁Z amb rano - Mar ín ▁along ▁with ▁other ▁members ▁of ▁the ▁Planet ary ▁Rad ar ▁Science ▁Group . ▁Under ▁satellite ▁naming ▁convent ions ▁by ▁the ▁Minor ▁Planet ▁Center , ▁the ▁satellite ▁would ▁be ▁provision ally ▁designated ▁. ▁With ▁the ▁discovery ▁of ▁a ▁satellite ▁around ▁, ▁the ▁mass ▁and ▁density ▁of ▁the ▁primary ▁body ▁can ▁be ▁determined ▁from ▁the ▁satellite ' s ▁orbit . ▁The ▁satellite ▁may ▁have ▁formed ▁as ▁a ▁result ▁of ▁rot ational ▁f ission ▁or ▁mass ▁e jection ▁of ▁the ▁primary ▁body , ▁since ▁ ▁along ▁with ▁other ▁binary ▁near - E arth ▁astero ids ▁have ▁been ▁observed ▁to ▁have ▁rapid ▁rotation ▁periods ▁and ▁s ph ero idal ▁shapes . ▁ ▁Phys ical ▁characteristics ▁ ▁With ▁a ▁diameter ▁of ▁at ▁least ▁ ▁across , ▁the ▁satellite ▁is ▁less ▁than ▁half ▁the ▁size ▁of ▁, ▁the ▁primary ▁component ▁of ▁the ▁binary ▁system . ▁The ▁magnitude ▁difference ▁between ▁the ▁satellite ▁and ▁primary ▁is ▁about ▁ 1 . 9 , ▁imp lying ▁an ▁absolute ▁magnitude ▁of ▁about ▁ 2 2 . 5 ▁for ▁the ▁satellite , ▁given ▁an ▁absolute ▁magnitude ▁of ▁ 2 0 . 6 ▁for ▁the ▁primary . ▁Ex cluding ▁delay - Do pp ler ▁effects ▁on ▁the ▁satellite ' s ▁bright ness ▁in ▁rad ar