Table 1.
Stellar groups recovered by SNN.
| SNN | Parent | Size | Stability |
 |
 |
 |
 |
 |
Group name | Blaauw | Reference |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | – | 681 | 3408 | 81.75 (0.84) | 2.29 (1.01) | 2.85 (0.09) | 1.45 (0.23) | −0.29 (0.33) | Briceno 1 | Ia | Briceño et al. (2007) |
| 2 | – | 149 | 3241 | 87.83 (1.01) | −7.92 (1.48) | 3.34 (0.12) | 0.19 (0.22) | −0.58 (0.21) | Orion Y | — | Kounkel et al. (2018) |
| 3 | – | 432 | 2852 | 83.69 (1.21) | −1.62 (0.72) | 2.77 (0.08) | 1.64 (0.33) | −1.25 (0.23) | OBP-near | Ib | This work |
| 4 | – | 630 | 2743 | 83.92 (0.99) | 9.77 (0.83) | 2.47 (0.1) | 1.26 (0.41) | −2.19 (0.25) | λ Ori | — | Murdin & Penston (1977) |
| 5 | – | 871 | 2240 | 83.83 (0.38) | −6.02 (0.64) | 2.59 (0.09) | 1.2 (0.21) | 0.45 (0.24) | NGC 1980 | Ic | Alves & Bouy (2012) |
| 6 | – | 202 | 1918 | 83.21 (0.55) | −1.55 (0.5) | 2.36 (0.08) | 0.04 (0.18) | −0.18 (0.21) | OBP-d | Ib | Kubiak et al. (2017) |
| 7 | – | 141 | 1403 | 81.98 (0.6) | 1.64 (0.58) | 2.71 (0.08) | −0.58 (0.21) | 0.75 (0.21) | ASCC20 | Ia | Kharchenko et al. (2013) |
| 8 | – | 146 | 978 | 78.36 (1.01) | −2.43 (0.79) | 2.61 (0.08) | 1.39 (0.19) | −0.65 (0.18) | L1616 | — | This work |
| 9 | – | 123 | 947 | 84.31 (0.52) | −0.68 (0.52) | 2.57 (0.08) | −1.11 (0.19) | −0.72 (0.18) | OBP-b | Ib | Kubiak et al. (2017) |
| 10 | – | 78 | 739 | 86.12 (0.89) | 7.29 (1.04) | 2.2 (0.1) | −3.3 (0.19) | −1.72 (0.2) | λ Ori South | — | This work |
| 11 | – | 80 | 647 | 77.99 (1.17) | −8.18 (2.19) | 3.54 (0.17) | 1.75 (0.24) | −2.99 (0.22) | Rigel | — | This work |
| 12 | – | 151 | 425 | 85.7 (0.5) | −8.11 (0.67) | 2.29 (0.08) | 0.09 (0.23) | −0.28 (0.22) | L1641S | Id | Strom et al. (1993) |
| 13 | 3 | 381 | 358 | 84.16 (0.89) | −1.53 (0.76) | 2.77 (0.09) | 1.78 (0.23) | −1.26 (0.24) | — | — | This work |
| 14 | – | 106 | 158 | 83.38 (0.74) | 3.97 (0.93) | 2.35 (0.08) | −0.94 (0.25) | 0.6 (0.19) | ome Ori | Ia | This work |
| 15 | – | 64 | 126 | 76.35 (1.03) | 12.41 (1.2) | 3.2 (0.15) | 1.8 (0.29) | −3.55 (0.2) | L1562 | — | This work |
| 16 | – | 77 | 110 | 81.58 (0.77) | 0.45 (0.68) | 2.37 (0.08) | 0.21 (0.24) | 1.43 (0.18) | OBP-West | — | This work |
| 17 | – | 115 | 84 | 85.58 (0.66) | −9.32 (0.86) | 2.18 (0.08) | 0.53 (0.22) | −1.19 (0.24) | L1647 | — | This work |
| 18 | 3 | 367 | 49 | 84.3 (0.8) | −1.63 (0.78) | 2.76 (0.1) | 1.8 (0.21) | −1.3 (0.24) | — | — | This work |
| 19 | – | 105 | 39 | 83.83 (0.53) | −1.64 (0.81) | 2.31 (0.07) | −1.38 (0.21) | 0.93 (0.19) | OBP-far | Ib | This work |
| 20 | – | 135 | 37 | 80.06 (1.24) | −4.1 (1.28) | 3.09 (0.09) | 0.87 (0.18) | −0.43 (0.14) | Orion X | — | Bouy & Alves (2015) |
| 21 | – | 71 | 35 | 81.03 (0.39) | −4.29 (0.41) | 2.61 (0.07) | 1.93 (0.21) | −1.0 (0.18) | L1634 | — | This work |
| 22 | – | 53 | 27 | 88.9 (0.72) | 0.45 (1.08) | 2.38 (0.11) | −2.12 (0.17) | −2.1 (0.2) | Orion B East | — | This work |
| 23 | – | 66 | 26 | 80.09 (2.25) | −9.94 (1.69) | 3.53 (0.16) | −0.17 (0.19) | −1.26 (0.19) | Orion Y extension | — | This work |
| 24 | – | 64 | 22 | 87.39 (0.95) | −5.06 (0.83) | 2.2 (0.09) | −2.49 (0.22) | 0.26 (0.2) | Orion A East | — | This work |
| 25 | 4 | 150 | 12 | 84.03 (0.51) | 9.73 (0.5) | 2.49 (0.08) | 0.96 (0.22) | −2.14 (0.18) | — | — | This work |
Notes. Each row corresponds to one distinct stellar group identified by either algorithm. The names in bold highlight the newly discovered groups. The columns from left to right show for each group: (1) the SNN group index; (2) the SNN group index of the immediate group that contains, or partially contains it; (3) the number of stars it contains; (4) the number of times it appears out of 7000 SNN runs; (5) the average RA; (6) the average Dec; (7) the average parallax; (8) the average PMRA; (9) the average PMDec; (10) identifier from previous works if already known and from this work in bold if newly discovered; (11) the Blaauw structure to which it belongs; (12) reference for the identifier in (10). The numbers in parentheses from Cols. (5) to (9) are the standard deviations of the quantities shown.
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