HD 219134 is an orange K-type dwarf (about 0.79 solar masses, 4,913 K, 0.77 solar radii), 21 light-years from Earth. HD 219134 is one of the nearest multi-planet systems, a K dwarf with transiting super-Earths and outer giant planets. The system hosts 6 confirmed planets on orbits ranging from 3.1 days to 6.15 years. With 6 confirmed worlds, HD 219134 is a densely packed system whose resonances, spacing, and formation history are active research topics. Mutual gravitational tugs between the planets can slowly reshape their orbits, preserving clues to the system's assembly. HD 219134 b skims its star closer than Mercury orbits the Sun.