The star is located at a distance of 237 light years[1] based on its parallax shift but is drifting closer at a high rate of 61.7 km/s.
[5] This star is over luminous and hot for its class, with it radiating at 2.31 the luminosity of the Sun[5] and an effective temperature of 5,847 K.[5] HD 203473 has different age estimates, either being 5[4] or 8[6] billion years old.
The higher luminosity and low projected rotational velocity of 1 km/s[6] favors the older age estimate.
[4] In 2018, the N2K project discovered an object, initially thought to be a planet, orbiting the star via Doppler spectroscopy.
[8] In 2022, the inclination and true mass of this companion were measured via astrometry, revealing it to be 96 MJ and thus either a massive brown dwarf or low-mass star.