15 Cancri

15 Cancri (15 Cnc, BM Cancri, BM Cnc) is an α² CVn variable star in the constellation Cancer. Its apparent magnitude is 5.62.

Radial velocity measurements taken at the Dominion Astrophysical Observatory in Victoria, British Columbia Canada in 1918 and 1919 led to the determination that 15 Cancri is a spectroscopic binary. The first orbit was calculated in 1973 by Helmut Abt and Michael Snowden with a period of 585 days however later measurements showed that the orbital period was 635 days.