Thanks for posting what I was thinking. It’s a flare star! Not very habitable.
Now if the planet had somehow produced a magnetic field (not very likely) then it ‘MIGHT’ have some type of atmosphere, but, not very likely at all.
As for the speed to get there, the problem isn’t the speed to get there, the problem would be slowing down to stay there. You get going up to .25c or so, you could get there in a reasonable amount of time, but, you would have to slow down for a long time to keep from overshooting the system altogether.
Physics be a harsh mistress! ARRRRRHHHH!
Accellerate for half the time, then deaccelerate for the last half. The problem is that in interstellar space, there are atoms and molecules, and rarely a dust particle or two.
The atoms hitting the spacecraft at > 0.1c will cause gamma emissions hazardous to the crew. Hitting a dust particle would cause serious problems. At close to c, some claim that the atoms hitting the spaceship will generate enough heat to melt it. Flash Gordon never had to worry about these problems.