HD 219134
HD 219134 (also known as Gliese 892 or HR 8832) is a main-sequence star in the constellation of Cassiopeia. It is smaller and less luminous than our Sun, with a spectral class of K3V, which makes it an orange-hued star. HD 219134 is relatively close to our system, with an estimated distance of 21.25 light years. This star is close to the limit of apparent magnitude that can still be seen by the unaided eye. The limit is considered to be magnitude 6 for most observers. This star has a magnitude 9.4 optical companion at an  angular separation of 106.6 arcseconds. Planetary system. HD 219134 has a system of 6 exoplanets. The innermost planet, HD 219134 b, is a rocky super-Earth based on size (1.6 times the size of Earth), and density (6.4 grams per cubic cm). This and three additional exoplanets; one super-Earth (designated "c" and later found to be rocky as well), one Neptunian world ("d"), and one Jovian world ("e"); were deduced using HARPS-N radial velocity data by Motalebi "et al." in 2015. Two months later, Vogt "et al." published a paper on this system which found a 6-planet  solution, with planets "b" & "c" corresponding to those in Motalebi "et al.", "e" & "g" corresponding to Motalebi's "d" & "e", and "d" & "f" being new planets. A total of four independent studies have been done regarding the planetary system of HD 219134, with some of their results conflicting with each other. As of March 2017, the star is known to have at least 5 planets, with two of them (HD 219134 b and c) known to be transiting, rocky super-Earths. The previously reported planets HD 219134 g and h were not reported in following HARPS-N analyses in March  2017 by Gillon "et al". Habitable Zone. The conservative habitable zone (CHZ) of HD 219134 is predicted to extend from 0.516 to 0.948 AU. None of the planets found orbiting the star are inside this habitable zone, although HD 219134 g orbits closest, but slightly interior, to the inner edge of the more optimistic empirical habitable zone, or recent Venus as it is sometimes described, which lies at 0.408 AU. The planet also appears to be significantly more massive than Earth and therefore it likely retains a dense atmosphere. It is probably tidally locked with as yet no planetary mass  satellites discovered in orbit.