CWNU 2
0.15
UTI
0.0
CN
0.14
Cdens
0.5
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
22
Core radius and density
1.8 [pc], 0.7 [pc-2]
- CN 0.0 Sparse
- Cdens 0.14 Very loose
- CC3 0.5 Intermediate quality
- Clit 0.06 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
CWNU 2 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age and metallicity parameters (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 | 139.744 | -65.701 | 1.394 | -9.462 | 5.918 | 1.391 |
| Hu & Soubiran | 2025 | 139.889 | -65.836 | â | â | â | â |
| Cavallo et al. | 2024 | 139.889 | -65.836 | 1.394 | â | â | â |
| Hunt & Reffert | 2023 | 139.758 | -65.649 | 1.383 | -9.502 | 5.966 | 0.422 |
| He et al. | 2022 | 140.058 | -66.04 | 1.39 | -9.45 | 5.9 | 8.6 |
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 | 0.72 | 0.57 | 0.89 | 96 | -0.120 | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.120(5) | â | â | â |
| Cavallo et al. | 2024 | 0.72 | 0.70 | â | 977 | -0.250 | â | â | â |
| Hunt & Reffert | 2023 | 0.71 | 0.50 | 0.89 | 96 | â | â | â | â |
| He et al. | 2022 | 0.79 | 0.57 | â | 50 | 0.374 | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.94 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.94 (50th percentile).