| System |
 |
Type | Comments | References |
| J0501.1-7211 | 3.343 | ? | no lc published | Yokogawa & Koyama (1998) |
| EXO 053109-6609.2 | 13.7 | ? | EXOSAT detection | Dennerl et al. (1995) |
| J0053.8-7226 | 46.6 | ? | no lc published | Corbet et al. (1998) |
| X 1839-04 | 81.1 | ? | no lc published | Koyama et al. (1990a) |
| J0051-722 | 91.1 | ? | Liu et al. (2001) | |
| AX 1820.5-1434 | 152 | ? | weak pulsations | Kinugasa et al. (1998) |
| J0054-720 | 169.3 | ? | no lc published | Lochner et al. (1998) |
| 3U 1239-599 | 191 | ? | Ariel obs, no lc published | Huckle et al. (1977) |
| XTE J1858+034 | 221 | ? | no lc published | Remillard et al. (1998) |
| 4U 2206 + 54 | 392 | ? | no lc published | Saraswat & Apparao (1992) |
| 1WGA J1958.2+3232 | 730 | ? | only ROSAT lc | Israel et al. (1998) |
| AX J0049.5-7323 | 755 | ? | weak pulsations | Yokogawa et al. (2000a) |