UBC 4
0.46
UTI
0.26
CN
0.3
Cdens
0.75
CC3
0.5
Clit
1.0
Cdup
Stellar density (N50/rad)
1.5 [N/pc2]
- CN 0.26 Poorly populated
- Cdens 0.3 Loose
- CC3 0.75 High quality
- Clit 0.5 Moderately 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 4 is a poorly populated, loose object of high C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low 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 moderately studied in the literature.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 60.906 | 35.385 | 1.681 | -0.788 | -5.737 | 0.746 |
| Li et al. | 2025 | 61.002 | 35.347 | 1.649 | -0.759 | -5.696 | â |
| Alfonso et al. | 2024 | 60.65 | 35.621 | 1.633 | -0.789 | -5.756 | â |
| Zhang et al. | 2024 | 60.658 | 35.561 | â | â | â | â |
| Cavallo et al. | 2024 | 60.861 | 35.456 | 1.671 | â | â | â |
| Hunt & Reffert | 2023 | 60.658 | 35.561 | 1.669 | -0.717 | -5.728 | 0.441 |
| Tarricq et al. | 2022 | 60.737 | 35.55 | 1.66 | -0.799 | -5.743 | â |
| Cantat-Gaudin et al. | 2020 | 61.002 | 35.347 | 1.649 | -0.759 | -5.696 | â |
| Cantat-Gaudin & Anders | 2020 | 61.002 | 35.347 | 1.649 | -0.759 | -5.696 | â |
| Castro-Ginard et al. | 2018 | 60.968 | 35.357 | 1.645 | -0.75 | -5.725 | 3.67 |
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 | 0.59 | 0.74 | 1.24 | 448 | -0.086 | â | â | â |
| Li et al. | 2025 | 0.56 | 0.82 | â | 370 | -0.061 | â | â | â |
| Alfonso et al. | 2024 | 0.61 | 0.54 | â | 770 | -0.112 | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.152(1) | â | â | â |
| Cavallo et al. | 2024 | 0.59 | 0.87 | â | 275 | 0.260 | â | â | â |
| Hunt & Reffert | 2023 | 0.57 | 0.74 | 1.24 | 207 | â | â | â | â |
| Tarricq et al. | 2022 | 0.59 | â | â | 550 | â | â | â | â |
| Cantat-Gaudin et al. | 2020 | 0.61 | 0.54 | â | 525 | â | â | â | â |
| Cantat-Gaudin & Anders | 2020 | 0.60 | â | â | â | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as a moving group.