UBC 628
0.44
UTI
0.63
CN
0.22
Cdens
0.75
CC3
0.29
Clit
1.0
Cdup
Nm (P>50%)
76
Core radius and density
3.2 [pc], 1.1 [pc-2]
- CN 0.63 Moderately populated
- Cdens 0.22 Very loose
- CC3 0.75 High quality
- Clit 0.29 Poorly 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 628 is a moderately populated, very loose object of high C3 quality. Its parallax locates it at a large distance, above 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 mass parameters (see Parameters). It is poorly studied in the literature.
Note: This object contains blue stragglers according to at least one source.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 107.145 | -6.209 | 0.169 | -0.533 | 0.597 | 76.371 |
| Li et al. | 2025 | 107.153 | -6.212 | 0.161 | -0.535 | 0.555 | â |
| Hu & Soubiran | 2025 | 107.143 | -6.203 | â | â | â | â |
| Almeida et al. | 2025 | 107.156 | -6.197 | â | â | â | â |
| Hunt & Reffert | 2024 | 107.142 | -6.212 | 0.168 | -0.56 | 0.631 | 89.57 |
| Cavallo et al. | 2024 | 107.143 | -6.203 | 0.169 | â | â | â |
| Hunt & Reffert | 2023 | 107.142 | -6.212 | 0.168 | -0.56 | 0.631 | 89.57 |
| Jadhav & Subramaniam | 2021 | 107.153 | -6.212 | â | â | â | â |
| Dias et al. | 2021 | 107.156 | -6.197 | 0.174 | -0.548 | 0.551 | 110.293 |
| Cantat-Gaudin et al. | 2020 | 107.153 | -6.212 | 0.161 | -0.535 | 0.555 | â |
| Castro-Ginard et al. | 2020 | 107.17 | -6.208 | 0.16 | -0.548 | 0.553 | 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 | 4.93 | 1.24 | 1.965 | 537 | -0.316 | 920 | â | 1 |
| Li et al. | 2025 | 5.67 | 1.53 | â | 537 | -0.312 | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.250(5) | â | â | â |
| Almeida et al. | 2025 | 5.38 | 1.65 | â | 459 | â | 1278 | â | â |
| Hunt & Reffert | 2024 | 4.93 | 1.24 | 1.96 | 453 | â | 920(1) | â | â |
| Cavallo et al. | 2024 | 3.72 | 1.19 | â | 851 | -0.320 | â | â | â |
| Hunt & Reffert | 2023 | 4.93 | 1.24 | 1.97 | 453 | â | â | â | â |
| Jadhav & Subramaniam | 2021 | 4.85 | 0.57 | â | 1585 | â | 315 | â | 1(1) |
| Dias et al. | 2021 | 5.38 | 1.65 | â | 459 | -0.337 | â | â | â |
| Cantat-Gaudin et al. | 2020 | 4.85 | 0.57 | â | 1585 | â | â | â | â |
| Kounkel et al. | 2020 | 4.80 | 2.08 | â | 776 | 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: good fit. Isochrone match: intermediate fit.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).