Based on parallax measurements, it is located at a distance of 107 light years from the Sun.

[9] This is a pulsating white dwarf of the DAV type that is the prototype of the ZZ Ceti variable class.

[3] This DA-class white dwarf is the surviving core of a red giant star that ceased nuclear fusion while shedding its outer envelope.

It has a (presumably) homogeneous core of carbon and oxygen, a relatively thin outer envelope of hydrogen, and a helium mantle.

It is radiating 0.3% of the luminosity of the Sun at an effective temperature of 12,281 K. Ross 548 is spinning with a period of ~38 hours.