UBC 580
0.20
UTI
0.29
CN
0.09
Cdens
0.25
CC3
0.19
Clit
1.0
Cdup
Nm (P>50%)
29
Core radius and density
2.2 [pc], 0.5 [pc-2]
- CN 0.29 Poorly populated
- Cdens 0.09 Very loose
- CC3 0.25 Low quality
- Clit 0.19 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 580 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is rarely studied in the literature.
â ī¸ Warning: the low UTI value and no obvious signs of duplication (Cdup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 303.235 | 35.906 | 0.237 | -2.426 | -4.519 | -26.269 |
| Almeida et al. | 2025 | 303.201 | 35.897 | â | â | â | â |
| Hunt & Reffert | 2024 | 303.208 | 35.902 | 0.256 | -2.444 | -4.518 | â |
| Cavallo et al. | 2024 | 303.22 | 35.912 | 0.254 | â | â | â |
| Hunt & Reffert | 2023 | 303.208 | 35.902 | 0.256 | -2.444 | -4.518 | â |
| Dias et al. | 2021 | 303.201 | 35.897 | 0.245 | -2.412 | -4.505 | -5.461 |
| Cantat-Gaudin et al. | 2020 | 303.206 | 35.92 | 0.242 | -2.401 | -4.5 | â |
| Castro-Ginard et al. | 2020 | 303.193 | 35.934 | 0.243 | -2.412 | -4.49 | 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 | 3.67 | 2.555 | 2.0 | 29 | 0.433 | 528 | â | â |
| Almeida et al. | 2025 | 3.95 | 2.48 | â | 7 | â | 456 | â | â |
| Hunt & Reffert | 2024 | 3.67 | 2.64 | 2.00 | 29 | â | 600(1) | â | â |
| Cavallo et al. | 2024 | 3.06 | 2.31 | â | 158 | 0.650 | â | â | â |
| Hunt & Reffert | 2023 | 3.67 | 2.63 | 2.00 | 29 | â | â | â | â |
| Dias et al. | 2021 | 3.95 | 2.48 | â | 7 | 0.216 | â | â | â |
| Kounkel et al. | 2020 | 2.69 | 2.76 | â | 32 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: intermediate fit.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.82 (50th percentile), true positive? (human-assigned).
Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.82 (50th percentile), true positive? (human-assigned).