UPK 52
0.20
UTI
0.0
CN
0.17
Cdens
0.62
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
22
Core radius and density
2.4 [pc], 0.8 [pc-2]
- CN 0.0 Sparse
- Cdens 0.17 Very loose
- CC3 0.62 Intermediate quality
- Clit 0.1 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
UPK 52 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (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 | 290.016 | 9.574 | 1.196 | -0.117 | -5.998 | -11.91 |
| Hunt & Reffert | 2024 | 289.939 | 9.644 | 1.205 | -0.173 | -5.995 | -11.915 |
| Cavallo et al. | 2024 | 289.967 | 9.606 | 1.212 | â | â | â |
| Hunt & Reffert | 2023 | 289.939 | 9.644 | 1.205 | -0.173 | -5.995 | -11.915 |
| Sim et al. | 2019 | 290.042 | 9.536 | â | -0.16 | -5.97 | 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 | 0.79 | 1.03 | 0.8 | 137 | -0.330 | 69 | â | â |
| Liu et al. | 2025 | 1.34 | 0.43 | â | 174 | â | â | â | â |
| Hunt & Reffert | 2024 | 0.79 | 1.03 | 0.80 | 137 | â | 69(1) | â | â |
| Cavallo et al. | 2024 | 0.77 | 1.15 | â | 158 | -0.330 | â | â | â |
| Hunt & Reffert | 2023 | 0.79 | 1.03 | 0.80 | 137 | â | â | â | â |
| Sim et al. | 2019 | 0.82 | â | â | 112 | 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) 300 along with OC_0070.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.85 (50th percentile), true positive (human-assigned).
Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.85 (50th percentile), true positive (human-assigned).