UBC 221
0.59
UTI
0.76
CN
1.0
Cdens
0.75
CC3
0.23
Clit
1.0
Cdup
Nm (P>50%)
127
Core radius and density
1.1 [pc], 7.8 [pc-2]
- CN 0.76 Rich
- Cdens 1.0 Very dense
- CC3 0.75 High quality
- Clit 0.23 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 221 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (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 | 114.297 | -15.68 | 0.401 | -1.254 | 2.848 | 37.636 |
| Li et al. | 2025 | 114.297 | -15.681 | 0.423 | -1.217 | 2.821 | â |
| Hu & Soubiran | 2025 | 114.303 | -15.687 | â | â | â | â |
| Hunt & Reffert | 2024 | 114.3 | -15.677 | 0.392 | -1.257 | 2.853 | 35.032 |
| Cavallo et al. | 2024 | 114.303 | -15.686 | 0.395 | â | â | â |
| Hunt & Reffert | 2023 | 114.3 | -15.677 | 0.392 | -1.257 | 2.853 | 35.032 |
| Jadhav & Subramaniam | 2021 | 114.297 | -15.681 | â | â | â | â |
| Cantat-Gaudin et al. | 2020 | 114.297 | -15.681 | 0.423 | -1.217 | 2.821 | â |
| Castro-Ginard et al. | 2020 | 114.295 | -15.674 | 0.424 | -1.221 | 2.816 | 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 | 2.26 | 0.99 | 1.54 | 708 | -0.140 | 522 | â | 0 |
| Li et al. | 2025 | 2.60 | 1.35 | â | 540 | 0.075 | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.210(5) | â | â | â |
| Hunt & Reffert | 2024 | 2.26 | 0.78 | 1.54 | 877 | â | 615(1) | â | â |
| Cavallo et al. | 2024 | 2.16 | 1.30 | â | 891 | -0.140 | â | â | â |
| Hunt & Reffert | 2023 | 2.26 | 0.78 | 1.54 | 877 | â | â | â | â |
| Jadhav & Subramaniam | 2021 | 2.39 | 0.99 | â | 708 | â | 428 | â | 0(1) |
| Cantat-Gaudin et al. | 2020 | 2.39 | 0.99 | â | 708 | â | â | â | â |
| Kounkel et al. | 2020 | 2.05 | 1.69 | â | 457 | 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 classes: 0.99 (50th percentile), true positive (human-assigned).
Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.99 (50th percentile), true positive (human-assigned).