UBC 643
0.65
UTI
0.52
CN
1.0
Cdens
0.75
CC3
0.5
Clit
1.0
Cdup
Radius (P>50% members)
2.5 [arcmin]
- CN 0.52 Moderately populated
- Cdens 1.0 Very dense
- CC3 0.75 High quality
- Clit 0.5 Moderately studied
- Cdup 1.0 Unique
Overview
UBC 643 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is moderately studied in the literature.
Distant
Moderate extinction
Near-solar metallicity
Intermediate age
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 120.508 | -34.398 | 0.247 | -1.446 | 2.165 | 51.914 |
| Almeida et al. | 2025 | 120.491 | -34.382 | â | â | â | â |
| Hunt & Reffert | 2024 | 120.505 | -34.398 | 0.245 | -1.45 | 2.166 | 51.917 |
| Cavallo et al. | 2024 | 120.499 | -34.401 | 0.246 | â | â | â |
| Hunt & Reffert | 2023 | 120.505 | -34.398 | 0.245 | -1.45 | 2.166 | 51.917 |
| Almeida et al. | 2023 | 120.491 | -34.382 | â | â | â | â |
| Dias et al. | 2021 | 120.491 | -34.382 | 0.2 | -1.493 | 2.13 | â |
| Cantat-Gaudin et al. | 2020 | 120.5 | -34.388 | 0.215 | -1.471 | 2.138 | â |
| Castro-Ginard et al. | 2020 | 120.493 | -34.381 | 0.215 | -1.473 | 2.135 | 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 | 4.01 | 1.68 | â | 176 | â | 272 | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 439* | â | â |
| Cavallo et al. | 2024 | 4.09 | 1.99 | â | 102 | 0.180 | â | â | â |
| Hunt & Reffert | 2023 | 3.59 | 1.49 | 1.23 | 226 | â | â | â | â |
| Almeida et al. | 2023 | 3.40 | 1.53 | â | 374 | -0.055 | 494* | 0.69 | â |
| Dias et al. | 2021 | 4.01 | 1.68 | â | 176 | 0.344 | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: intermediate fit.
Cavallo et al. (2024)
Gold sample.