UBC 121
0.67
UTI
0.7
CN
1.0
Cdens
0.75
CC3
0.45
Clit
1.0
Cdup
Stellar density (N50/rad)
11.7 [N/pc2]
- CN 0.7 Moderately populated
- Cdens 1.0 Very dense
- CC3 0.75 High quality
- Clit 0.45 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 121 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near 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 poorly studied in the literature.
Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 288.888 | 12.84 | 0.587 | -1.255 | -3.389 | -25.612 |
| Li et al. | 2025 | 288.891 | 12.844 | 0.567 | -1.238 | -3.355 | â |
| Almeida et al. | 2025 | 288.906 | 12.859 | â | â | â | â |
| Hunt & Reffert | 2024 | 288.879 | 12.847 | 0.578 | -1.261 | -3.386 | -9.078 |
| Cavallo et al. | 2024 | 288.891 | 12.838 | 0.587 | â | â | â |
| Hunt & Reffert | 2023 | 288.879 | 12.847 | 0.578 | -1.261 | -3.386 | -9.078 |
| Dias et al. | 2021 | 288.906 | 12.859 | 0.553 | -1.252 | -3.346 | â |
| Cantat-Gaudin et al. | 2020 | 288.891 | 12.844 | 0.567 | -1.238 | -3.355 | â |
| Castro-Ginard et al. | 2020 | 288.893 | 12.855 | 0.565 | -1.248 | -3.347 | 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 | 1.625 | 2.84 | 2.38 | 104 | 0.024 | 878 | â | â |
| Li et al. | 2025 | 0.81 | 2.18 | â | 1198 | -0.134 | â | â | â |
| Almeida et al. | 2025 | 1.64 | 2.84 | â | 12 | â | 554 | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 1202(1) | â | â |
| Cavallo et al. | 2024 | 1.75 | 3.12 | â | 182 | 0.580 | â | â | â |
| Hunt & Reffert | 2023 | 1.58 | 3.40 | 2.38 | 45 | â | â | â | â |
| Dias et al. | 2021 | 1.64 | 2.84 | â | 12 | 0.024 | â | â | â |
| Cantat-Gaudin et al. | 2020 | 1.61 | 2.19 | â | 162 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Classified as optical pair P50, along with HSC_402.
Cavallo et al. (2024)
Gold sample.
Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: intermediate fit.