UBC 643
0.40
UTI
0.52
CN
0.28
Cdens
0.75
CC3
0.23
Clit
1.0
Cdup
Nm (P>50%)
53
Core radius and density
2.1 [pc], 1.4 [pc-2]
- CN 0.52 Moderately populated
- Cdens 0.28 Loose
- CC3 0.75 High quality
- Clit 0.23 Rarely studied
- Cdup 1.0 Unique
đĨ Members
đ Colab
đŦ Bayestar19
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
Overview
UBC 643 is a moderately populated, loose 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 and metallicity parameters (see Parameters). It is rarely studied in the literature.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 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] | Bfrac | BSS |
|---|---|---|---|---|---|---|---|---|---|
| UCC | 99999â | 3.59 | 1.68 | 1.23 | 176 | 0.180 | 439 | 0.69 | â |
| Almeida et al. | 2025 | 4.01 | 1.68 | â | 176 | â | 272 | â | â |
| Hunt & Reffert | 2024 | 3.59 | 1.49 | 1.23 | 226 | â | 439(1) | 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(1) | 0.69 | â |
| Dias et al. | 2021 | 4.01 | 1.68 | â | 176 | 0.344 | â | â | â |
| Kounkel et al. | 2020 | 3.44 | 2.40 | â | 58 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: intermediate fit.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).