Each view is assigned a status, based on likelihood that the view is possible. These are as follows:
Confirmed – 100% possible, almost always confirmed by an image.
Likely – Not confirmed, but very likely to be broadly possible based on distance and environmental factors.
If Clear – Likely possible, but only under ideal weather conditions.
Plausible – Under the right conditions this view could be possible, but more evidence is required.
Dubious – This view is probably mathematically possible, but the conditions required to confirm it might never happen.
Unlikely – Almost or simply outright impossible (destination is obstructed by something else or is below the horizon), even under ideal conditions.