It is much older than Sun with an estimated age of 9.4 billion years and is spinning slowly with a projected rotational velocity of 1.2 km/s.
[5] The star is radiating nearly double[6] the luminosity of the Sun from its photosphere at an effective temperature of 5,882 K.[7] A low-mass stellar companion at a projected separation of 155 AU was discovered in 2016.
[9] In 2010 one superjovian planet or brown dwarf on an eccentric orbit was discovered utilising the radial velocity method.
[10] Designated component Ab, the high eccentricity of this object may have been caused by interaction with the secondary star.
[4] In 2022, the inclination and true mass of HD 217786 Ab were measured via astrometry, and a second planet was discovered orbiting closer to the star.