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Table 2.

Overview of average parameters as derived from Gaia DR2 parallaxes and proper motions of YSOs for the 14 subregions and Orion X.

Subregion NGaia ϖ σϖ d σd μα* σμ, α* μδ σμ, δ vα σv, α vδ σv, δ
mas mas pc pc mas yr−1 mas yr−1 mas yr−1 mas yr−1 km s−1 km s−1 km s−1 km s−1
L1647-S 17 2.11 0.15 474 34 0.49 0.64 −1.15 0.75 1.07 1.42 −2.58 1.67
L1647-N 32 2.26 0.18 443 35 0.40 0.43 −1.15 0.82 0.81 0.90 −2.46 1.76
L1641-S 69 2.33 0.23 429 43 0.35 0.53 −0.47 0.58 0.67 1.04 −1.00 1.21
L1641-S/C 29 2.43 0.21 412 35 0.34 0.57 −0.48 0.62 0.62 1.06 −1.00 1.35
L1641-C 70 2.55 0.17 392 26 0.61 0.81 −0.70 1.16 1.09 1.52 −1.31 2.16
L1641-N 181 2.58 0.17 388 26 1.05 0.64 0.09 0.75 1.93 1.20 0.16 1.41
OMC-4/5 116 2.51 0.16 399 25 1.18 0.67 −0.12 0.77 2.23 1.29 −0.24 1.49
OMC-1 186 2.47 0.14 405 23 1.38 0.84 −0.13 1.08 2.67 1.65 −0.25 2.10
OMC-2/3 115 2.59 0.16 387 24 1.30 0.70 −0.35 0.95 2.40 1.32 −0.66 1.79
L1630-S 57 2.56 0.20 391 31 0.52 0.80 −0.47 0.94 0.94 1.47 −0.84 1.73
L1630-N 74 2.32 0.17 430 31 −0.52 0.82 −0.98 0.41 −1.11 1.74 −2.00 0.84
L1622 8 2.96 0.09 338 11 4.90 0.33 −0.07 0.28 7.85 0.51 −0.11 0.44
L1616 18 2.59 0.14 386 21 0.75 0.34 −0.94 0.32 1.39 0.63 −1.73 0.61
IC2118 5 3.41 0.16 293 14 0.70 0.22 −3.44 0.22 0.97 0.28 −4.79 0.44
Orion X 135 3.08 0.11 325 11 0.89 0.23 −0.43 0.15 1.37 0.36 −0.67 0.23

Notes. The listed parameters are average values as determined for each subregion with σ referring to the standard deviation. The column NGaia lists the number of YSOs that were used to estimate the averages.

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