thanks, that's reassuring to hear.
just Imagine how relieved these people will be when they realized their calculations and assumptions were wrong!
they can sell all their guns, food and gold, take a vacation and live happily ever after again.
Unfortunately people like this will just cling onto the next potential disaster, and the next, and the next.
Another thing I forgot to add is that typically a brown dwarf the size of a gas giant like Jupiter should be about 80 to 100 times as massive as a gas giant, greatly increasing the gravitational effects it would have on other bodies in our solar system. There is absolutely no way something that massive could come near us and not be noticed. Jupiter is massive enough to control the path or orbit of almost any celestial object (comet, asteroid, etc) entering and exiting our solar system. If something 80-100 times as massive were anywhere near us, the orbit of nearly every comet and asteroid in or around our solar system would be altered drastically.
Picture related.