Table 3.
Averaged parallaxes and derived distances to different large-scale sub-regions in Orion A.
| Region | l-Range | Sample | Mean(ϖ) | Mean(d) | Median(ϖ) | Median(d) |
|---|---|---|---|---|---|---|
| (°) | size | (mas) | (pc) | (mas) | (pc) | |
| Orion A (all) | 208–215 | 650 | 2.50 ± 0.20 | 400 ± 32 | 2.52 ± 0.10 | 397 ± 16 |
| Head (ISF) | 208–211 | 483 | 2.55 ± 0.16 | 393 ± 25 | 2.54 ± 0.08 | 393 ± 13 |
| Tail | 211–215 | 145 | 2.33 ± 0.24 | 428 ± 42 | 2.33 ± 0.17 | 430 ± 31 |
| Tail-L1641 | 211–214 | 130 | 2.36 ± 0.23 | 424 ± 42 | 2.35 ± 0.17 | 426 ± 31 |
| Tail-L1647-South | 214–215 | 15 | 2.14 ± 0.18 | 467 ± 32 | 2.17 ± 0.07 | 461 ± 15 |
Notes. The averages per l-range are calculated within −20.5°< b < −18.1°. The reported parallaxes and distances do not include a systematic global offset. Shown as uncertainties are the standard deviation from the mean and the median absolute deviation. On top of this we expect a systematic error of about 10 pc.
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