UPK 65
0.54
UTI
0.56
CN
0.3
Cdens
1.0
CC3
0.42
Clit
1.0
Cdup
Nm (P>50%)
63
Core radius and density
2.0 [pc], 1.5 [pc-2]
- CN 0.56 Moderately populated
- Cdens 0.3 Loose
- CC3 1.0 Very high quality
- Clit 0.42 Poorly 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
UPK 65 is a moderately populated, loose object of very high C3 quality. Its parallax locates it at a close distance, above 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 age and metallicity parameters (see Parameters). It is poorly studied in the literature.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 286.455 | 23.29 | 1.312 | -1.843 | -3.625 | -16.156 |
| Liu et al. | 2025 | 286.53 | 23.3 | 1.32 | -1.83 | -3.67 | -17.89 |
| Li et al. | 2025 | 286.514 | 23.337 | 1.291 | -1.84 | -3.587 | â |
| Hu & Soubiran | 2025 | 286.534 | 23.34 | â | â | â | â |
| Almeida et al. | 2025 | 286.531 | 23.357 | â | â | â | â |
| Alfonso et al. | 2024 | 286.491 | 23.266 | 1.281 | -1.823 | -3.649 | â |
| Hunt & Reffert | 2024 | 286.525 | 23.297 | 1.317 | -1.832 | -3.667 | -17.892 |
| Cavallo et al. | 2024 | 286.534 | 23.34 | 1.311 | â | â | â |
| Hunt & Reffert | 2023 | 286.525 | 23.297 | 1.317 | -1.832 | -3.667 | -17.892 |
| Almeida et al. | 2023 | 286.555 | 23.333 | â | â | â | â |
| He et al. | 2022 | 286.515 | 23.271 | 1.291 | -1.836 | -3.647 | â |
| Tarricq et al. | 2022 | 286.543 | 23.375 | 1.286 | -1.816 | -3.635 | â |
| Dias et al. | 2021 | 286.531 | 23.357 | 1.287 | -1.836 | -3.582 | â |
| Cantat-Gaudin et al. | 2020 | 286.514 | 23.337 | 1.291 | -1.84 | -3.587 | â |
| Cantat-Gaudin & Anders | 2020 | 286.514 | 23.349 | 1.287 | -1.841 | -3.586 | â |
| Sim et al. | 2019 | 286.502 | 23.325 | â | -1.86 | -3.56 | 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 | 0.75 | 1.07 | 1.32 | 275 | 0.017 | 105 | 0.7 | â |
| Liu et al. | 2025 | 1.46 | 0.46 | â | 166 | â | â | â | â |
| Li et al. | 2025 | 0.69 | 1.00 | â | 497 | -0.146 | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.090(5) | â | â | â |
| Almeida et al. | 2025 | 0.77 | 1.12 | â | 214 | â | 105 | â | â |
| Alfonso et al. | 2024 | 0.74 | 0.80 | â | 446 | 0.123 | â | â | â |
| Hunt & Reffert | 2024 | 0.73 | 1.07 | 1.32 | 224 | â | 95(1) | â | â |
| Cavallo et al. | 2024 | 0.80 | 0.99 | â | 646 | 0.400 | â | â | â |
| Hunt & Reffert | 2023 | 0.73 | 1.07 | 1.32 | 224 | â | â | â | â |
| Almeida et al. | 2023 | 0.75 | 1.41 | â | 249 | -0.271 | 111(1) | 0.70 | â |
| He et al. | 2022 | â | 1.10 | â | 501 | â | â | â | â |
| Tarricq et al. | 2022 | 0.73 | â | â | 288 | â | â | â | â |
| Dias et al. | 2021 | 0.77 | 1.12 | â | 214 | 0.123 | â | â | â |
| Cantat-Gaudin et al. | 2020 | 0.74 | 0.80 | â | 275 | â | â | â | â |
| Cantat-Gaudin & Anders | 2020 | 0.76 | â | â | â | â | â | â | â |
| Sim et al. | 2019 | 0.76 | â | â | 794 | 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 tidal capture (resonant trapping binary) 392 along with Theia_978, and of multiple system 81 along with HSC_446 and Theia_978.
Palma et al. (2025)
Part of multiple system G178, along with HSC_437, HSC_446, UPK_56 and Theia_978.
Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).