LDS 6219 (55 Cancri) is a binary system located 41 light-years away. The primary component is a main sequence star, or a subgiant of spectral type K0IV-V, with a mass of 0.90 and a radius of 0.98 times that of the Sun. The companion is a red dwarf of spectral type M4.5V, with a mass of 0.26 and a radius of 0.27 times that of the Sun. There is an unconfirmed hypothesis that the companion itself is a binary star. The components are separated on the sky by approximately 85", corresponding to a distance of 1065 AU (6.15 light-days). The components are gravitationally bound and form a common proper motion (CPM) pair. The 55 Cancri system is the first known system with four or more planets. Currently, five exoplanets orbiting the primary component have been confirmed, and there are indications that more might exist. The planets have been named Gallileo, Brahe, Lipperhey, Janssen, and Harriot.

100mm: 55 Cancri is one of the most challenging multiple star systems I have observed so far. The difficulty lies in the very low brightness of the companion, which has an apparent magnitude of only 13.15. Even though the components are separated by nearly 85", the faint illumination from the primary component still affects the surrounding area, complicating the observation of the companion. I observed this system twice. The first time was on March 1st, 2025, when, after several minutes of concentrated side-viewing, I began to see the companion as a flickering point. The following day, I repeated the observation and confirmed it with a sketch. I observed at 150x magnification.