UBC 40
0.57
UTI
0.33
CN
1.0
Cdens
0.5
CC3
0.5
Clit
1.0
Cdup
Stellar density (N50/rad)
11.5 [N/pc2]
- CN 0.33 Poorly populated
- Cdens 1.0 Very dense
- CC3 0.5 Intermediate 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 40 is a poorly populated, very dense object of intermediate C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the absorption and age 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 | 22.643 | 60.243 | 0.412 | -1.087 | -0.611 | â |
| Almeida et al. | 2025 | 22.633 | 60.244 | â | â | â | â |
| Hunt & Reffert | 2024 | 22.63 | 60.238 | 0.416 | -1.087 | -0.641 | â |
| Cavallo et al. | 2024 | 22.59 | 60.246 | 0.416 | â | â | â |
| Hunt & Reffert | 2023 | 22.63 | 60.238 | 0.416 | -1.087 | -0.641 | â |
| Dias et al. | 2021 | 22.633 | 60.244 | 0.363 | -1.061 | -0.614 | â |
| Cantat-Gaudin et al. | 2020 | 22.643 | 60.245 | 0.402 | -1.082 | -0.556 | â |
| Cantat-Gaudin & Anders | 2020 | 22.643 | 60.245 | 0.402 | -1.082 | -0.556 | â |
| Castro-Ginard et al. | 2019 | 22.629 | 60.236 | 0.402 | -1.014 | -0.564 | 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 | 2.32 | 1.205 | 0.5 | 109 | -0.088 | 230 | â | â |
| Liu et al. | 2025 | 2.87 | 0.34 | â | 155 | â | â | â | â |
| Almeida et al. | 2025 | 2.23 | 1.38 | â | 109 | â | 344 | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 115(1) | â | â |
| Cavallo et al. | 2024 | 2.68 | 1.66 | â | 44 | 0.050 | â | â | â |
| Hunt & Reffert | 2023 | 2.32 | 1.03 | 0.50 | 242 | â | â | â | â |
| Dias et al. | 2021 | 2.23 | 1.38 | â | 109 | -0.226 | â | â | â |
| Cantat-Gaudin et al. | 2020 | 2.45 | 1.03 | â | 79 | â | â | â | â |
| Cantat-Gaudin & Anders | 2020 | 2.32 | â | â | â | 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 primordial binary cluster 372 along with UBC_41.
Palma et al. (2025)
Classified as optical pair P604, along with UBC_41.
Cavallo et al. (2024)
Gold sample.
Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit. Silver sample.