UPK 40
0.52
UTI
0.31
CN
0.26
Cdens
0.75
CC3
0.65
Clit
1.0
Cdup
Radius (P>50% members)
25.4 [arcmin]
- CN 0.31 Poorly populated
- Cdens 0.26 Loose
- CC3 0.75 High quality
- Clit 0.65 Moderately studied
- Cdup 1.0 Unique
Overview
UPK 40 is a poorly populated, loose object of high C3 quality. Its parallax locates it at a close 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 metallicity parameter (see Parameters). It is moderately studied in the literature.
Close
Moderate extinction
Near-solar metallicity
Intermediate age
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 292.62 | -6.924 | 1.518 | 0.345 | -9.093 | -0.503 |
| Li et al. | 2025 | 292.631 | -6.882 | 1.522 | 0.294 | -9.12 | â |
| Almeida et al. | 2025 | 292.562 | -6.614 | â | â | â | â |
| Alfonso et al. | 2024 | 292.76 | -6.637 | 1.454 | 0.295 | -9.17 | â |
| Cavallo et al. | 2024 | 292.422 | -7.201 | 1.547 | â | â | â |
| Hunt & Reffert | 2023 | 292.591 | -7.201 | 1.539 | 0.336 | -9.235 | -0.66 |
| Almeida et al. | 2023 | 292.521 | -6.642 | â | â | â | â |
| Tarricq et al. | 2022 | 292.828 | -7.074 | 1.527 | 0.273 | -9.075 | â |
| Dias et al. | 2021 | 292.562 | -6.614 | 1.521 | 0.311 | -9.129 | â |
| Cantat-Gaudin et al. | 2020 | 292.631 | -6.882 | 1.522 | 0.294 | -9.12 | â |
| Cantat-Gaudin & Anders | 2020 | 292.634 | -6.86 | 1.509 | 0.314 | -9.108 | â |
| Sim et al. | 2019 | 292.637 | -6.608 | â | 0.29 | -9.13 | 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] | Bfr | BSS |
|---|---|---|---|---|---|---|---|---|---|
| Li et al. | 2025 | 0.59 | 1.02 | â | 514 | -0.140 | â | â | â |
| Almeida et al. | 2025 | 0.65 | 1.19 | â | 197 | â | 55 | â | â |
| Alfonso et al. | 2024 | 0.67 | 0.69 | â | 508 | 0.093 | â | â | â |
| Cavallo et al. | 2024 | 0.63 | 0.94 | â | 178 | 0.560 | â | â | â |
| Hunt & Reffert | 2023 | 0.63 | 1.08 | 0.38 | 166 | â | â | â | â |
| Almeida et al. | 2023 | 0.64 | 1.13 | â | 476 | -0.128 | 197* | 0.75 | â |
| Tarricq et al. | 2022 | 0.65 | â | â | 550 | â | â | â | â |
| Dias et al. | 2021 | 0.65 | 1.19 | â | 197 | 0.093 | â | â | â |
| Cantat-Gaudin et al. | 2020 | 0.67 | 0.69 | â | 537 | â | â | â | â |
| Cantat-Gaudin & Anders | 2020 | 0.65 | â | â | â | â | â | â | â |
| Sim et al. | 2019 | 0.64 | â | â | 562 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as a moving group.