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y Centauri (y Cen), is a star located in the constellation Centaurus. y Centauri is also known as HD 120987 and HR 5222. y Centauri 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 around the AB component, which contains two F4V dwarf stars, with 3 other stars further out.
y Centauri AB, also known as HR 102987B, and CD 359090 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 y Centauri A, and was first discovered by AH Howe, in 1889. The angular separation is less than one arcsec. y Centauri AB orbit each other with a true separation of approximately 0.8 AU.
y Centauri AC, also known as, HR 102987C, CD 359090 C, is a white dwarf of apparent visual magnitude of +12.5. y Centauri AC orbits the AB pair with angular separation of 27.5 arcsec. The star was first discovered by SW Burnham. y Centauri AC orbits the AB pair at a distance of 24 AUs, less than the distance of Uranus from the Sun.
y Centauri AD, also known as, HR 102987D, CD 359090 D, is a white dwarf of apparent visual magnitude of +14.5. y Centuari AD orbits the AB pair with angular separation of 30 arcsec. The star was first discovered by Robert T.A. Innes. y Centauri AD orbits the AB pair at a distance of about 26 AUs, within the orbit of Neptune.
y Centauri AE, also known as, HR 102987E, CD 359089 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 y Centauri A, and was the first component of the quintuple system discovered. y Centauri AE orbits the AB pair at a distance of 57 AUs, or about twice the distance of Neptune from the Sun.