UBC 284
0.73
UTI
0.83
CN
1.0
Cdens
1.0
CC3
0.4
Clit
1.0
Cdup
Stellar density (N50/rad)
42.9 [N/pc2]
- CN 0.83 Rich
- Cdens 1.0 Very dense
- CC3 1.0 Very high quality
- Clit 0.4 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 284 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity parameter (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 | 184.276 | -62.955 | 0.531 | -7.184 | -1.331 | -38.246 |
| Li et al. | 2025 | 184.283 | -62.952 | 0.504 | -7.19 | -1.335 | â |
| Hu & Soubiran | 2025 | 184.253 | -62.956 | â | â | â | â |
| Hunt & Reffert | 2024 | 184.29 | -62.953 | 0.53 | -7.183 | -1.322 | -33.748 |
| Cavallo et al. | 2024 | 184.253 | -62.957 | 0.531 | â | â | â |
| Hunt & Reffert | 2023 | 184.29 | -62.953 | 0.53 | -7.183 | -1.322 | -33.748 |
| Cantat-Gaudin et al. | 2020 | 184.283 | -62.952 | 0.504 | -7.19 | -1.335 | â |
| Castro-Ginard et al. | 2020 | 184.263 | -62.95 | 0.505 | -7.179 | -1.335 | 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 | 1.775 | 0.935 | 0.24 | 1534 | -0.159 | 1781 | â | â |
| Li et al. | 2025 | 1.76 | 1.14 | â | 1482 | -0.159 | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.310(5) | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 1781(1) | â | â |
| Cavallo et al. | 2024 | 1.72 | 0.93 | â | 1585 | 0.200 | â | â | â |
| Hunt & Reffert | 2023 | 1.79 | 0.87 | 0.24 | 1422 | â | â | â | â |
| Cantat-Gaudin et al. | 2020 | 1.86 | 0.94 | â | 1585 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Part of multiple system G249, along with NGC_4349 and Theia_7490.
Cavallo et al. (2024)
Gold sample.