UPK 189
0.21
UTI
0.0
CN
0.23
Cdens
0.62
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
21
Core radius and density
1.7 [pc], 1.1 [pc-2]
- CN 0.0 Sparse
- Cdens 0.23 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 189 is a sparse, very loose object of intermediate 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, young 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 | 332.965 | 65.564 | 1.015 | -2.604 | -3.409 | -18.997 |
| Liu et al. | 2025 | 332.95 | 65.59 | 1.0 | -2.62 | -3.37 | -33.19 |
| Hunt & Reffert | 2024 | 332.945 | 65.588 | 0.995 | -2.625 | -3.368 | -33.189 |
| Cavallo et al. | 2024 | 332.893 | 65.819 | 0.993 | â | â | â |
| Hunt & Reffert | 2023 | 332.945 | 65.588 | 0.995 | -2.625 | -3.368 | -33.189 |
| Sim et al. | 2019 | 332.913 | 65.568 | â | -2.65 | -3.32 | 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 | 0.99 | 1.835 | 2.21 | 23 | 0.250 | 92 | â | â |
| Liu et al. | 2025 | 1.94 | 0.62 | â | 27 | â | â | â | â |
| Hunt & Reffert | 2024 | 0.96 | 1.92 | 2.21 | 23 | â | 92(1) | â | â |
| Cavallo et al. | 2024 | 0.99 | 1.75 | â | 52 | 0.250 | â | â | â |
| Hunt & Reffert | 2023 | 0.96 | 1.92 | 2.21 | 23 | â | â | â | â |
| Sim et al. | 2019 | 1.00 | â | â | 16 | 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 380 along with UBC_396, and as primordial binary cluster 394 along with CWNU_1107, and of multiple system 33 along with CWNU_1107, UBC_396 and Theia_3779.
Palma et al. (2025)
Part of multiple system G29, along with Theia_3779, CWNU_1107 and UBC_396.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.96 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.96 (50th percentile).