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Table 1.
References for the previously known OCs.
| Reference | OCs | Data |
|---|---|---|
| number | used | |
| Dias et al. (2002) | 2167 | WEBDA (1) et al. |
| Dias et al. (2014) | 1805 | UCAC4 (2) |
| Kharchenko et al. (2013) | 3006 | 2MASS (3) and PPMXL (4) |
| Schmeja et al. (2014) | 139 | 2MASS |
| Scholz et al. (2015) | 63 | PPMXL and UCAC4 |
| Cantat-Gaudin et al. (2018) | 1229 | Gaia DR2 |
| Cantat-Gaudin et al. (2019) | 41 | Gaia DR2 |
| Castro-Ginard et al. (2018) | 23 | Gaia DR2 and TGAS (5) |
| Castro-Ginard et al. (2019) | 53 | Gaia DR2 |
| Castro-Ginard et al. (2020) | 582 | Gaia DR2 |
| Liu & Pang (2019) | 76 | Gaia DR2 |
| He et al. (2021) | 74 | Gaia DR2 |
| Ferreira et al. (2020) | 25 | Gaia DR2 |
Notes. (1) WEBDA: http://obswww.unige.ch/webda/; (2) UCAC = United States Naval Observatory CCD Astrograph Catalog; (3) 2MASS = Two Micron All Sky Survey; (4) PPMXL: https://dc.zah.uni-heidelberg.de/ppmxl/q/cone/info; (5) TGAS = Tycho-Gaia Astrometric Solution.
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