A robot spacecraft returned samples from the planetesimal $98765$ ALEKS, located in the outer Solar System. Mass$-$spectroscopic ana data on the isotopes of ruthenium in these samples:

$\backslash$table$[[$isotope$,\backslash$table$[[$mass$],[($amu$)]],\backslash$table$[[$relative$],[$abundance$]]],{[}^{99}Ru,98\mathrm{.}9,50.\%$