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Table 1.

Distances to sub-regions in Orion A from the literature.

Reference Method Region Distance
Genzel et al. (1981) Proper motion and radial velocity Orion KL 480 ± 80
of H2O masers
Hirota et al. (2007) VERA/VLBI Orion KL 437 ± 19
Menten et al. (2007) VLBI ONC 414 ± 7
Sandstrom et al. (2007) VLBI ONC
Kim et al. (2008) VERA/VLBI Orion KL 418 ± 6
Lombardi et al. (2011) Density of foreground stars Orion A 371 ± 10

Schlafly et al. (2014) a PanSTARRS optical reddening (l/b) at (208.4°,−19.6°) north of the ONC
(Green et al. 2014) (l/b) at (209.1°,−19.9°) west of the ONC
(l/b) at (209.0°,−20.1°) west of the ONC
(l/b) at (209.8°,−19.5°) north to L1641-North
(l/b) at (212.2°,−18.6°) east to L1641-South
(l/b) at (212.4°,−19.9°) west to L1641-South
(l/b) at (214.7°,−19.0°) south-east of L1647-South

Kounkel et al. (2017)a VLBI 15 YSOs near the ONC 388 ± 5
2 YSOs near L1641-South 428 ± 10

Kounkel et al. (2018) Gaia DR2 of APOGEE-2 sources ONC 386 ± 3
+ HR-diagram selection L1641-South 417 ± 4
L1647 443 ± 5

Kuhn et al. (2018) Gaia DR2 of Chandra X-ray sources ONC
North and south to ONC ∼395



See also Fig. A.1.

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