Assertion: spacecraft | /r/CapableOf | begin its primary mapping mission
Facets:
value: in march
type: TEMPORAL
value: after a year
type: TEMPORAL
value: after a half
type: TEMPORAL
Source sentences:
text: After a year and a half trimming its orbit from a looping ellipse to a circular track around the planet, the spacecraft began its primary mapping mission in March 1999.