Maunder Minimum
Like the Sun, 47 Ursae Majoris is on the main sequence, converting hydrogen to helium in its core by nuclear fusion. Based on its chromospheric activity, the star may be around 6,000 million years old, though evolutionary models suggest an older age of around 8,700 million years. Other studies have yielded estimates of 4,400 and 7,000 million years for the star. The low level of magnetic activity makes it a Maunder Minimum candidate star.