UBC 557
0.68
UTI
0.68
CN
1.0
Cdens
0.75
CC3
0.5
Clit
1.0
Cdup
Radius (P>50% members)
8.7 [arcmin]
- CN 0.68 Moderately populated
- Cdens 1.0 Very dense
- CC3 0.75 High quality
- Clit 0.5 Moderately studied
- Cdup 1.0 Unique
Overview
UBC 557 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is moderately studied in the literature.
Note: This object shares a significant percentage of members with a later reported entry. See table with shared members information.
Relatively close
Moderate extinction
Near-solar metallicity
Young
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 256.199 | -38.955 | 0.655 | 1.469 | -0.42 | -14.918 |
| Almeida et al. | 2025 | 256.172 | -38.973 | â | â | â | â |
| Hunt & Reffert | 2024 | 256.199 | -38.922 | 0.658 | 1.477 | -0.416 | -14.911 |
| Cavallo et al. | 2024 | 256.198 | -38.957 | 0.658 | â | â | â |
| Hunt & Reffert | 2023 | 256.199 | -38.922 | 0.658 | 1.477 | -0.416 | -14.911 |
| Almeida et al. | 2023 | 256.17 | -38.985 | â | â | â | â |
| Dias et al. | 2021 | 256.172 | -38.973 | 0.647 | 1.458 | -0.39 | â |
| Cantat-Gaudin et al. | 2020 | 256.181 | -38.983 | 0.63 | 1.456 | -0.4 | â |
| Castro-Ginard et al. | 2020 | 256.163 | -38.983 | 0.634 | 1.454 | -0.406 | â |
đĄ Note: The UCC values are estimated from its identified members.
| Reference | Year | Dist [kpc] | Av [mag] | DAv [mag] | Age [Myr] | [Fe/H] [dex] | Mass [Msun] | Bfr | BSS |
|---|---|---|---|---|---|---|---|---|---|
| Almeida et al. | 2025 | 1.49 | 1.69 | â | 73 | â | 261 | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 396* | â | â |
| Cavallo et al. | 2024 | 1.29 | 1.89 | â | 155 | -0.450 | â | â | â |
| Hunt & Reffert | 2023 | 1.44 | 1.49 | 1.05 | 97 | â | â | â | â |
| Almeida et al. | 2023 | 1.42 | 1.63 | â | 38 | 0.115 | 352* | 0.59 | â |
| Dias et al. | 2021 | 1.49 | 1.69 | â | 73 | 0.203 | â | â | â |
| Cantat-Gaudin et al. | 2020 | 1.61 | 1.36 | â | 145 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit. Silver sample.
Cavallo et al. (2024)
Gold sample.