UBC 537
0.59
UTI
0.76
CN
0.72
Cdens
1.0
CC3
0.23
Clit
1.0
Cdup
Nm (P>50%)
118
Core radius and density
1.9 [pc], 3.6 [pc-2]
- CN 0.76 Rich
- Cdens 0.72 Moderately dense
- CC3 1.0 Very 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 537 is a rich, moderately dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the distance, absorption, age, and metallicity parameters (see Parameters). It is rarely studied in the literature.
Note: This object shares a large percentage of members with 2 later reported entries. 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 | 242.894 | -53.038 | 0.301 | -2.485 | -2.017 | -64.747 |
| Hu & Soubiran | 2025 | 242.902 | -53.047 | â | â | â | â |
| Hunt & Reffert | 2024 | 242.886 | -53.039 | 0.308 | -2.502 | -2.026 | -56.465 |
| Cavallo et al. | 2024 | 242.902 | -53.047 | 0.307 | â | â | â |
| Hunt & Reffert | 2023 | 242.886 | -53.039 | 0.308 | -2.502 | -2.026 | -56.465 |
| Jadhav & Subramaniam | 2021 | 242.896 | -53.037 | â | â | â | â |
| Cantat-Gaudin et al. | 2020 | 242.896 | -53.037 | 0.29 | -2.435 | -2.018 | â |
| Castro-Ginard et al. | 2020 | 242.91 | -53.044 | 0.292 | -2.432 | -2.022 | 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 | 3.16 | 2.93 | 1.94 | 389 | -0.250 | 1201 | â | 0 |
| Liu et al. | 2025 | 8.13 | 0.90 | â | 389 | â | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.080(5) | â | â | â |
| Hunt & Reffert | 2024 | 2.91 | 2.93 | 1.94 | 234 | â | 1601(1) | â | â |
| Cavallo et al. | 2024 | 1.85 | 2.97 | â | 794 | -0.420 | â | â | â |
| Hunt & Reffert | 2023 | 2.91 | 2.93 | 1.94 | 234 | â | â | â | â |
| Jadhav & Subramaniam | 2021 | 3.31 | 0.69 | â | 2188 | â | 801 | â | 0(1) |
| Cantat-Gaudin et al. | 2020 | 3.31 | 0.69 | â | 2188 | â | â | â | â |
| Kounkel et al. | 2020 | 3.16 | 2.93 | â | 275 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Liu et al. (2025)
Classified as hyperbolic encounter pair 368 along with Theia_3669.
Palma et al. (2025)
Classified as optical pair P69, along with Theia_3669.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.94 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.94 (50th percentile).