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The system WDS 16329+0315 is an old, nearby quintuple physical system in thethick Galactic disc formed by a close-resolved, triple primary of solarmetallicity, namely HD 149162, and a very wide, common proper motion, secondarypair, formed by the mid-M dwarf G-17-23 and the white dwarf LSPM J1633+0311S.We present an exhaustive astrometric and photometric data compilation of thesystem, including Gaia DR2 parallaxes and proper motions, and the firstanalysis of the nature of the faintest component. LSPM J1633+0311S (HD 149162C) is a very cool white dwarf with an effective temperature of only about 5500K, near the coolest end of the grid of theoretical models.

Cool dwarfs in wide multiple systems. Paper 6: A curious quintuple  system of a compact Sun-like triple and a close pair of an M dwarf and a very  cool white dwarf at a wide separation