UBC 123
0.54
UTI
0.76
CN
0.64
Cdens
1.0
CC3
0.16
Clit
1.0
Cdup
Nm (P>50%)
114
Core radius and density
2.3 [pc], 3.2 [pc-2]
- CN 0.76 Rich
- Cdens 0.64 Moderately dense
- CC3 1.0 Very high quality
- Clit 0.16 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 123 is a rich, moderately dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a massive, near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption and age 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 | 294.183 | 18.244 | 0.403 | -2.107 | -4.753 | 20.247 |
| Li et al. | 2025 | 294.181 | 18.247 | 0.39 | -2.102 | -4.725 | â |
| Hunt & Reffert | 2024 | 294.174 | 18.237 | 0.398 | -2.103 | -4.763 | 16.225 |
| Cavallo et al. | 2024 | 294.181 | 18.252 | 0.403 | â | â | â |
| Hunt & Reffert | 2023 | 294.174 | 18.237 | 0.398 | -2.103 | -4.763 | 16.225 |
| Cantat-Gaudin et al. | 2020 | 294.181 | 18.247 | 0.39 | -2.102 | -4.725 | â |
| Castro-Ginard et al. | 2020 | 294.185 | 18.255 | 0.389 | -2.119 | -4.734 | 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 | 2.3 | 3.05 | 1.99 | 96 | -0.132 | 1293 | â | â |
| Li et al. | 2025 | 0.92 | 0.97 | â | 13893 | -0.054 | â | â | â |
| Hunt & Reffert | 2024 | 2.30 | 3.17 | 1.99 | 93 | â | 1293(1) | â | â |
| Cavallo et al. | 2024 | 2.30 | 3.34 | â | 49 | -0.210 | â | â | â |
| Hunt & Reffert | 2023 | 2.30 | 3.17 | 1.99 | 93 | â | â | â | â |
| Cantat-Gaudin et al. | 2020 | 2.38 | 2.41 | â | 257 | â | â | â | â |
| Kounkel et al. | 2020 | 3.05 | 2.93 | â | 98 | 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 open cluster. CMD class: 0.82 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.82 (50th percentile).