comet discoverer(s) or namesake(s) orbital period (years) spacecraft encounter(s)
comet
discoverer -lrb- s -rrb- or namesake -lrb- s -rrb-
orbital period -lrb- years -rrb-
spacecraft encounter -lrb- s -rrb-
list length
number
list length list_first list_second
text <tc, text> number <c, text(text)>
1p/halley halley 75.32 giotto (flyby 1986), vega 1 (flyby 1986), vega 2 (flyby 1986), suisei (flyby 1986) ice (distant flyby 1986), sakigake (distant flyby 1986)
how many different flyby 's have been done for the halley comet ?
WRB JJ JJ NN POS VBD-AUX VBD-AUX VBN IN DT NNP NNP .