Y Centauri or Y Cen (HD 127233, HIP 70969) is a variable star in the constellation of Centaurus.  Its position is RA 14h 30m 58.770s by dec 30°S 5' 52.00". The spectral class is M4 to M7.
The variability in the star was discovered by P. F. Fleming in 1895 and it was given a designation H52 in the Harvard Catalogue of Variable Stars.
The type of variable is SRb.
The IRAS designation is 14280-2952. The star contains a 22 GHz water masar emission.
- "Y Cen - Frosty Drew Observatory & Sky Theatre". Retrieved 30 July 2013.
- Pickering, Edward Charles (1905). "Second supplement to Catalogue of Variable Stars". Annals of Harvard College Observatory 53: 143–153. Bibcode:1905AnHar..53..143P.
- Lewis, B. M. (October 1997). "A renewed search for water maser emission from Mira Variables". The Astrophysical Journal 114: 1602–1606.