UBC 545
0.57
UTI
0.59
CN
0.24
Cdens
1.0
CC3
0.5
Clit
1.0
Cdup
Nm (P>50%)
68
Core radius and density
2.9 [pc], 1.2 [pc-2]
- CN 0.59 Moderately populated
- Cdens 0.24 Very loose
- CC3 1.0 Very high quality
- Clit 0.5 Moderately 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 545 is a moderately populated, very loose object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is moderately studied in the literature.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 248.529 | -48.89 | 0.355 | -1.111 | -2.693 | -49.572 |
| Li et al. | 2026 | 248.54 | -48.9 | â | â | â | â |
| Li et al. | 2025 | 248.527 | -48.881 | 0.332 | -1.095 | -2.721 | â |
| Almeida et al. | 2025 | 248.521 | -48.918 | â | â | â | â |
| Hunt & Reffert | 2024 | 248.53 | -48.883 | 0.365 | -1.127 | -2.677 | -49.525 |
| Cavallo et al. | 2024 | 248.534 | -48.882 | 0.365 | â | â | â |
| Hunt & Reffert | 2023 | 248.53 | -48.883 | 0.365 | -1.127 | -2.677 | -49.525 |
| Dias et al. | 2021 | 248.521 | -48.918 | 0.339 | -1.094 | -2.685 | â |
| Cantat-Gaudin et al. | 2020 | 248.527 | -48.881 | 0.332 | -1.095 | -2.721 | â |
| Castro-Ginard et al. | 2020 | 248.522 | -48.902 | 0.329 | -1.089 | -2.697 | 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 | 2.46 | 2.59 | 2.21 | 19 | 0.062 | 490 | â | â |
| Li et al. | 2025 | 2.18 | 2.53 | â | 79 | 0.062 | â | â | â |
| Almeida et al. | 2025 | 3.14 | 2.50 | â | 6 | â | 283 | â | â |
| Hunt & Reffert | 2024 | 2.46 | 2.65 | 2.21 | 19 | â | 697(1) | â | â |
| Cavallo et al. | 2024 | 1.88 | 3.11 | â | 47 | -0.460 | â | â | â |
| Hunt & Reffert | 2023 | 2.46 | 2.65 | 2.21 | 19 | â | â | â | â |
| Dias et al. | 2021 | 3.14 | 2.50 | â | 6 | 0.269 | â | â | â |
| Cantat-Gaudin et al. | 2020 | 2.57 | 2.13 | â | 35 | â | â | â | â |
| Kounkel et al. | 2020 | 2.00 | 2.81 | â | 13 | 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=93+/-68.2 [pc], r_c=0.44+/-0.0 [pc]; stars within r_t: N~105
Palma et al. (2025)
Classified as optical pair P569, along with Teutsch_82.
Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: intermediate fit. Silver sample.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.72 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.72 (50th percentile).