BD-11 4672

BD−11 4672 is a single star with a pair of orbiting exoplanets in the southern constellation of Scutum, the shield. The designation BD−11 4672 comes from the Bonner Durchmusterung star catalogue, which was published during the nineteenth century in Germany. With an apparent visual magnitude of 9.99,^[3] the star is much too faint to be viewed with the naked eye. It is located at a distance of 89 light years from the Sun, as determined from parallax,^[2] but is drifting closer with a radial velocity of −87.5 km/s.^[5] This was recognised as a high proper motion star by German astronomer Max Wolf in 1924^[8] and is traversing the celestial sphere at an angular rate of 0.401 arcsec yr⁻¹.^[9]

The spectrum of BD−11 4672 matches a K-type main-sequence star, an orange dwarf, with a stellar classification of K7 V.^[4] Its age is not well constrained, but is probably older than the Sun. It is a metal-poor star, showing an iron abundance that is 35% of solar.^[6] No significant flare activity was detected.^[10] The star shows evidence of a Sun-like magnetic activity cycle with a period of 7–10 years.^[3] It has 65% of the mass and 64% of the radius of the Sun. The star is radiating 16% of the luminosity of the Sun from its photosphere at an effective temperature of 4,550 K.^[3]