SGR J1745−2900
SGR J1745−2900, or PSR J1745−2900, is the first-discovered magnetar orbiting the black hole Sagittarius A*, in the center of the Milky Way. The magnetar was discovered in 2013 using the Effelsberg 100-m Radio Telescope, the Nancay Decimetric Radio Telescope, and the Jodrell Bank Lovell Telescope. The magnetar has a period of 3.76 s and a magnetic flux density of ~ 1010 T. The magnetar, which is also a pulsar, is 0.33 ly from the central black hole.
The object helps researchers probe the ionized interstellar medium toward the Galactic Center, and could be useful in testing quantum gravity effects.