Tycho G has been proposed as the surviving binary companion star of the SN 1572 supernova event.

The star is located about 6,400±1,500 light-years away in the constellation Cassiopeia.

It is a subgiant, similar to the Sun in temperature, but more evolved and luminous.

The postfix "G" originates from the candidate companion stars considered in a 2004 study, labelled Tycho A to Tycho V.[4] Tycho G is travelling away from us at nearly 80 km/s, much faster than the mean velocity of other stars in its stellar neighbourhood.

It matches the properties of some models for the pre-supernova star system, although other studies exclude it.