HD 120987 (y Cen or y Centauri) is a star located in the constellation Centaurus. HD 120987 is a quintuple star system located 50 pc (163 light years) from the Sun. The system is located at RA 13h 53m 32.8s, and Dec -35 deg 39 arcmin 51 arcsec. The entire system has an apparent visual magnitude of +5.54, and an absolute magnitude of +2.03. The system is both a visual and spectroscopic binary. The system is centered on the AB component, which contains two F4V dwarf stars, with 3 other stars further out.
HD 120987 B is an F4V dwarf of apparent visual magnitude +6.4, and absolute visual magnitude of +2.9. The star has a mass of 1.5 solar masses, and effective temperature 6900 Kelvin. The star is a spectroscopic binary with HD 120987 A, and was first discovered by AH Howe, in 1889. The angular separation is less than one arcsec. HD 120987 AB orbit each other with a true separation of approximately 0.8 AU.
HD 120987 C is a white dwarf of apparent visual magnitude of +12.5. HD 120987 AC orbits the AB pair with angular separation of 27.5 arcsec. The star was first discovered by SW Burnham. HD 120987 AC orbits the AB pair at a distance of 24 AUs, less than the distance of Uranus from the Sun.
HD 120987 D is a white dwarf of apparent visual magnitude of +14.5. y Centauri AD orbits the AB pair with angular separation of 30 arcsec. The star was first discovered by Robert T.A. Innes. HD 120987 AD orbits the AB pair at a distance of about 26 AUs, within the orbit of Neptune.
HD 120987 E is located 66 arcsec from the primary. It has an apparent visual magnitude of 8.51, and was first discovered by William Herschel. It is a visual binary to HD 120987 A, and was the first component of the quintuple system discovered. HD 120987 AE orbits the AB pair at a distance of 57 AUs, or about twice the distance of Neptune from the Sun.
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