Assertion: comet | /r/CapableOf | remain visible
Facets:
value: for about a year
type: TEMPORAL
value: by naked eye
type: MANNER
value: until the end of september
type: TEMPORAL
value: without aid
type: MANNER
value: in february
type: TEMPORAL
value: for 569 days
type: TEMPORAL
Source sentences:
text: The last naked-eye observations were reported in December 1997, which meant that the comet had remained visible without aid for 569 days, or about 18 and a half months.
text: The comet remained visible in February 2008 though it had become a challenging target at about magnitude +5 in the constellation Perseus.
text: The comet will remain visible for the next year or so, and the best opportunities to see it are still ahead of us.
text: The comet remained visible by naked eye until the end of September.
text: Unless their trajectories are known from a previous pass (in modern times), comets are usually first detected several AU (Astronomical Unit - the radius of the Earth's orbit) from the Sun and remain visible for about a year.