| WR | 20a | |
| Reference | VII | |
| HD | | |
| Alias1 | DR3 5255678160756667776 | |
| Alias2 | SMS 2 | |
| Alias3 | | |
| Right Ascension J2000 (h:m:s) | 10 23 58.00 | |
| Declination J2000 (d:m:s) | -57 45 48.9 | |
| Galactic Longitude (deg) | 284.2667 | |
| Galactic Latitude (deg) | -0.3380 | |
| Spectral Type | WN7:h/C; O3If*/WN6+O3If*/WN6 | SMS99; CW11 |
| Binary Status | | |
| umag | | |
| bmag | 15.52 | SM91 |
| vmag | 14.14 | SM91 |
| rmag | | |
| Umag | 15.26 | MV75a |
| Bmag | 15 | MV75a |
| Vmag | 13.47 | MV75a |
| Gmag | 12.25 | DR2 |
| Jmag | 8.858 | CS03 |
| Hmag | 8.083 | CS03 |
| Kmag | 7.588 | CS03 |
| Cluster | Westerlund 2 | |
| Association | | |
| Star Forming Region | RCW49/RM10 SFC26? | |
| Distance | 4.115 | CRB23 |
| NebulaM/td> | |