UPK 118
0.24
UTI
0.25
CN
0.11
Cdens
0.62
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
25
Core radius and density
1.7 [pc], 0.6 [pc-2]
- CN 0.25 Poorly populated
- Cdens 0.11 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 118 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a low-mass, near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption parameter (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 | 314.048 | 39.892 | 1.073 | -1.653 | -3.568 | -8.907 |
| Hunt & Reffert | 2024 | 314.114 | 39.573 | 1.055 | -1.632 | -3.547 | -12.069 |
| Cavallo et al. | 2024 | 314.009 | 39.735 | 1.063 | â | â | â |
| Hunt & Reffert | 2023 | 314.114 | 39.573 | 1.055 | -1.632 | -3.547 | -12.069 |
| Sim et al. | 2019 | 314.019 | 40.048 | â | -1.65 | -3.5 | 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 | 0.94 | 0.775 | 1.33 | 43 | 0.060 | 43 | â | â |
| Liu et al. | 2025 | 0.96 | 0.23 | â | 58 | â | â | â | â |
| Hunt & Reffert | 2024 | 0.90 | 0.77 | 1.33 | 37 | â | 43(1) | â | â |
| Cavallo et al. | 2024 | 0.97 | 1.28 | â | 43 | 0.060 | â | â | â |
| Hunt & Reffert | 2023 | 0.90 | 0.78 | 1.33 | 37 | â | â | â | â |
| Sim et al. | 2019 | 0.94 | 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 primordial binary cluster 56 along with CWNU_96.
Palma et al. (2025)
Classified as optical pair (not dynamically associated) P380, along with CWNU_96.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).