J01-A is the second star in the system. Because of the 3-body problem, if there is 2 massive objects with a system with less masive objects, the system is unstable so J01-A is the 1 to blame for causing chaos to all orbits in the JD01-A bisolar system. she is also responsible for the fate for life on P02-A and the orbits of moons closer than P02-A. Even though she loves her 4 planets, she will be responsible for ejecting P02-A and moons near his orbit. other than that, J01-A fuses hydrogens more calmly than D01-A, if you break her apart, she will have 3 nuclear fusion layers and a thin, invisible photosphere. Her 3 fusion layers are hydrogen fusing layer which is 97% of her, and there is a deuterium fusing layer and a little helium core which is around the size of that of P02-A.  Her core is small because she is still young for her life and she is less energetic so she fuses way slower but that doesn't mean that P02-A shouldn't worry about muons from her, she is still a sun and she sends about 4% of the total amount of muons heading toward P02-A. She is the most massive orange dwarf known to the system that isn't a yellow dwarf, a greater star type.