100km across would be a pretty large comet; how much warning would humanity likely get that the comet is incoming?
Between 1 and 10 years - likely 3After it crosses Saturn orbit, it will take 5.25 years to get to the Sun. Unlikely it will be observed before crossing Saturn orbit as there is no constant monitoring there and it is very dim there.
100km across would be a pretty large comet; how much warning would humanity likely get that the comet is incoming?
Between 1 and 10 years - likely 3
After it crosses Saturn orbit, it will take 5.25 years to get to the Sun. Unlikely it will be observed before crossing Saturn orbit as there is no constant monitoring there and it is very dim there.