High Quality Content by WIKIPEDIA articles! Centaurus X-1 (Cen X-1) according to SIMBAD is supernova remnant SNR G315-02.3. G315.4-2.3 (Cen XR-1) is the most likely SNR of SN 185 (RCW 86). But, Cen X-1, Cen XR-1, and SN 185 may not be the same X-ray...