UBC 93
0.73
UTI
0.76
CN
1.0
Cdens
1.0
CC3
0.44
Clit
1.0
Cdup
Nm (P>50%)
123
Core radius and density
1.2 [pc], 5.8 [pc-2]
- CN 0.76 Rich
- Cdens 1.0 Very dense
- CC3 1.0 Very high quality
- Clit 0.44 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 93 is a rich, very 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, 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.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 268.575 | -25.397 | 0.316 | -0.862 | -1.927 | -10.484 |
| Li et al. | 2026 | 268.57 | -25.4 | â | â | â | â |
| Li et al. | 2025 | 268.575 | -25.399 | 0.334 | -0.923 | -1.875 | â |
| Hunt & Reffert | 2024 | 268.577 | -25.404 | 0.315 | -0.819 | -1.949 | -7.495 |
| Cavallo et al. | 2024 | 268.577 | -25.395 | 0.315 | â | â | â |
| Hunt & Reffert | 2023 | 268.577 | -25.404 | 0.315 | -0.819 | -1.949 | -7.495 |
| Jadhav & Subramaniam | 2021 | 268.575 | -25.399 | â | â | â | â |
| Cantat-Gaudin et al. | 2020 | 268.575 | -25.399 | 0.334 | -0.923 | -1.875 | â |
| Castro-Ginard et al. | 2020 | 268.573 | -25.39 | 0.339 | -0.931 | -1.884 | 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 | 2.43 | 3.98 | 2.88 | 170 | -0.438 | 1278 | â | 0 |
| Li et al. | 2025 | 2.06 | 2.98 | â | 834 | 0.155 | â | â | â |
| Hunt & Reffert | 2024 | 2.93 | 3.98 | 2.88 | 170 | â | 1867(1) | â | â |
| Cavallo et al. | 2024 | 2.01 | 4.37 | â | 62 | -1.030 | â | â | â |
| Hunt & Reffert | 2023 | 2.93 | 3.98 | 2.88 | 169 | â | â | â | â |
| Jadhav & Subramaniam | 2021 | 2.43 | 2.69 | â | 813 | â | 690 | â | 0(1) |
| Cantat-Gaudin et al. | 2020 | 2.43 | 2.69 | â | 813 | â | â | â | â |
| Kounkel et al. | 2020 | 2.13 | 4.06 | â | 35 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Li et al. (2026)
Tidal & Core radii: r_t=42+/-55.5 [pc], r_c=0.47+/-0.02 [pc]; stars within r_t: N~132
Palma et al. (2025)
Part of multiple system G183, along with CWNU_2379 and HSC_56.
Cavallo et al. (2024)
Bronze sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.11 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.11 (50th percentile).