UPK 599
0.55
UTI
0.75
CN
0.14
Cdens
1.0
CC3
0.42
Clit
1.0
Cdup
Nm (P>50%)
100
Core radius and density
5.5 [pc], 0.7 [pc-2]
- CN 0.75 Rich
- Cdens 0.14 Very 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 599 is a rich, very loose object of very high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low 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 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 | 205.762 | -38.561 | 1.486 | -9.975 | 0.232 | -9.986 |
| Yan et al. | 2026 | 206.089 | -38.77 | 1.463 | -10.022 | 0.284 | â |
| Li et al. | 2025 | 205.84 | -38.576 | 1.458 | -9.945 | 0.293 | â |
| Almeida et al. | 2025 | 205.878 | -38.647 | â | â | â | â |
| Alfonso et al. | 2024 | 205.746 | -38.527 | 1.434 | -9.98 | 0.224 | â |
| Swiggum et al. | 2024 | 206.089 | -38.77 | 1.463 | -10.022 | 0.284 | -8.485 |
| Hunt & Reffert | 2024 | 206.089 | -38.77 | 1.463 | -10.022 | 0.284 | -8.648 |
| Celli et al. | 2024 | 205.84 | -38.576 | â | â | â | â |
| Cavallo et al. | 2024 | 205.68 | -38.493 | 1.477 | â | â | â |
| Hunt & Reffert | 2023 | 206.089 | -38.77 | 1.463 | -10.022 | 0.284 | -8.648 |
| He et al. | 2022 | 205.714 | -38.603 | 1.489 | -10.035 | 0.239 | â |
| Dias et al. | 2021 | 205.878 | -38.647 | 1.479 | -9.933 | 0.332 | -8.062 |
| Spina et al. | 2021 | 205.868 | -38.574 | 1.459 | -9.925 | 0.331 | â |
| Cantat-Gaudin et al. | 2020 | 205.84 | -38.576 | 1.458 | -9.945 | 0.293 | â |
| Cantat-Gaudin & Anders | 2020 | 205.84 | -38.574 | 1.448 | -9.995 | 0.369 | â |
| Sim et al. | 2019 | 205.944 | -38.581 | â | -9.95 | 0.3 | 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 | 0.675 | 0.19 | 0.82 | 19 | 0.137 | 142 | â | â |
| Yan et al. | 2026 | â | â | â | 19 | â | â | â | â |
| Li et al. | 2025 | 0.78 | 0.13 | â | 125 | 0.253 | â | â | â |
| Almeida et al. | 2025 | 0.68 | 0.25 | â | 76 | â | 132 | â | â |
| Alfonso et al. | 2024 | 0.65 | 0.10 | â | 25 | 0.137 | â | â | â |
| Swiggum et al. | 2024 | 0.66 | â | â | 13 | â | 244 | â | â |
| Hunt & Reffert | 2024 | 0.65 | 0.19 | 0.82 | 13 | â | 41(1) | â | â |
| Celli et al. | 2024 | â | â | â | 20 | â | 152 | â | â |
| Cavallo et al. | 2024 | 0.74 | 0.41 | â | 6 | -0.060 | â | â | â |
| Hunt & Reffert | 2023 | 0.65 | 0.19 | 0.82 | 13 | â | â | â | â |
| He et al. | 2022 | â | 0.05 | â | 18 | â | â | â | â |
| Dias et al. | 2021 | 0.68 | 0.25 | â | 76 | 0.137 | â | â | â |
| Spina et al. | 2021 | 0.69 | â | â | 19 | â | â | â | â |
| Cantat-Gaudin et al. | 2020 | 0.65 | 0.10 | â | 19 | â | â | â | â |
| Cantat-Gaudin & Anders | 2020 | 0.68 | â | â | â | â | â | â | â |
| Sim et al. | 2019 | 0.67 | â | â | 20 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Yan et al. (2026)
Number of WDs: expected from single-star evolution N=0, with probability of formation through binary evolution >=0.5 N=1.
Palma et al. (2025)
Classified as genetic pair P245, along with Theia_6680.
Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit. Silver sample.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.95 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.95 (50th percentile).