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.^[1][2] 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.

SGR J1745−2900

Image of SGR J1745−2900 produced by the Chandra X-ray Observatory
Observation data Epoch J2000      Equinox J2000
Constellation	Sagittarius
Right ascension	17h 45m 40.21s[1]
Declination	−29° 00′ 29.2″[1]
Apparent magnitude (V)	?
Other designations
PSR J1745−2900
Database references
SIMBAD	data

The object offers an unparalleled tool for probing the ionized interstellar medium (ISM) toward the Galactic Center (GC),^[3] and a possible way to test quantum gravity effects.^[4]