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Table 3
Summary of distance estimates for RCW 49/Westerlund 2.
| Target | d (kpc) | Band/Method | Component | Reference |
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| RCW 49 | 6 | Radio observations | Radio nebula | Westerlund (1961) |
| Wd2 | 5 | Optical photometry | Stars | Moffat & Vogt (1975) |
| RCW 49 | 0 or 4.9 | Radio recombination lines | Radio nebula | Caswell & Haynes (1987) |
| Wd2 | 7.9 |
Optical photometry | Stars | Moffat et al. (1991) |
| RCW 49 | 2.31 | Kinematic of HII regions | Ionized gas | Brand & Blitz (1993) |
| Wd2 | 5.7 ± 0.3 | Optical spectroscopy | Stars | Piatti et al. (1998) |
| Wd2 | 2.8 | Near-infrared photometry | Stars | Ascenso et al. (2007) |
| Wd2 | 8 ± 1.4 | Optical spectrophotometry | Early-type stars | Rauw et al. (2007) |
| RCW 49 and Wd2 | 2–5 | X-ray photometry | T Tauri stars | Tsujimoto et al. (2007) |
| Wd2, HESS J1023–575 | 6 ± 1 | CO emission, HI absorption lines | Molecular gas | Dame (2007) |
| RCW 49 | 6 | IR | Bow shocks | Povich et al. (2008) |
| RCW 49 | 5.4 |
CO emission | Molecular gas | Furukawa et al. (2009) |
| Pulsar 1023-5746 | 2.4 | γ-ray pulsar pseudo-distance | Pulsar | Saz Parkinson et al. (2010) |
| Wd2 | 6.5–9 | Optical spectrophotometry | Eclipsing early-type | |
| stars + WR20 a | Rauw et al. (2011) | |||
| Wd2 | 3.0 | Optical spectrophotometry/ | ||
| anomalous extinction law | Bright stars | Carraro et al. (2013) | ||
| Wd2 | 4.42 ± 0.07 | HST spectrophotometry | 26 O-type stars | Vargas Álvarez et al. (2013) |
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