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Table 1
Positions, relative proper motions and velocities of knots associated with Th 28.
| Object | α (2000) | δ (2000) | Δμαcosδ | Δμδ | λ | v | Reference point |
| (Epoch 2010.4) | (arcsec yr-1) | (arcsec) | (km s-1) | ||||
|
|
|||||||
| HH 228 E3 | 16:08:42.4 | –39:03:30 | +0.118 ± 0.05 | +0.294 ± 0.05 | 147 | 300 | center of the nebula |
| HH 228 E4 | 16 08 48.3 | –39:03:23 | +0.371 ± 0.03 | +0.066 ± 0.05 | 210 | 357 | peak of the central condensation |
| HH 989 B | 16:08:54.7 | –39:03:28 | +0.135 ± 0.07 | −0.022 ± 0.03 | 287 | 130 | center of the condensation |
| HH 989 C | 16:08:57.7 | –39:04:17 | −0.058 ± 0.05 | −0.092 ± 0.03 | 322 | 103 | peak of the eastern condensation |
| HH 989 | 16:09:00.1 | –39:03:41 | +0.328 ± 0.05 | +0.049 ± 0.05 | 347 | 314 | approximate center of the condensation |
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