XTE J1550-564, sometimes abbreviated to J1550 and also known as V381 Normae, is a low-mass X-ray binary in the constellation Norma.

It is composed of a black hole around 10 times as massive as the Sun,[3] and a star of spectral type K3III.

The black hole fires out jets of matter that are thought to arise from an accretion disk, and is hence known as a microquasar.

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