AR Scorpii

[3] It is located close to the ecliptic plane in the constellation Scorpius.

Parallax measurements made by Gaia put the system at a distance of about 380 light-years (120 parsecs).

In addition, the system shows very strong optical, ultraviolet, and radio pulsations originating from the red dwarf with a period of just 1.97 minutes, which is a beat period from the orbital rotation and the white dwarf spin.

Although the white dwarf shows evidence of accretion in the past, at present it is not accreting significantly, and the system is powered by the spin-down of the white dwarf.

[7][5] The white dwarf's rotation will slow down on a timescale of 107 years.