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 (1014 G). 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 (ISM) toward the Galactic Center (GC), and could be useful in testing quantum gravity effects.
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