Gaia DR3 parallax measurements place the stars at a distance of 407 and 414 light years respectively.

It has an apparent magnitude of 5.71,[2] making it faintly visible to the naked eye as a yellowish-orange-hued star.

[20] Meanwhile, the secondary HD 187421 has an apparent magnitude of 6.37,[2] placing it near the limit for naked eye visibility.

It radiates 88.3 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 5,140 K.[11] HD 187420 is metal deficient at [Fe/H] = −0.17[12] and spins modestly with a projected rotational velocity of 2.4 km/s.

[9] It radiates 37.1 times the luminosity of the Sun[11] from its photosphere at an effective temperature of 9,099 K,[14] giving it a white hue.