CWNU 2259
0.15
UTI
0.0
CN
0.02
Cdens
0.62
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
22
Core radius and density
5.2 [pc], 0.1 [pc-2]
- CN 0.0 Sparse
- Cdens 0.02 Very loose
- CC3 0.62 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 2259 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It was recently reported 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 | 110.893 | -18.427 | 0.32 | -2.424 | 2.998 | â |
| Cavallo et al. | 2024 | 110.837 | -18.396 | 0.318 | â | â | â |
| Hunt & Reffert | 2023 | 110.802 | -18.634 | 0.319 | -2.427 | 3.003 | â |
| He et al. | 2023 | 111.021 | -18.349 | 0.316 | -2.387 | 2.97 | 64.21 |
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 | 2.94 | 0.89 | 0.96 | 159 | -0.320 | â | â | â |
| Liu et al. | 2025 | 3.80 | 0.26 | â | 162 | â | â | â | â |
| Cavallo et al. | 2024 | 2.74 | 1.11 | â | 85 | -0.320 | â | â | â |
| Hunt & Reffert | 2023 | 2.86 | 0.78 | 0.96 | 156 | â | â | â | â |
| He et al. | 2023 | 3.02 | 1.00 | â | 562 | â | â | â | â |
Liu et al. (2025)
Classified as primordial binary cluster 114 along with Ruprecht_16.
Palma et al. (2025)
Classified as optical pair P200, along with Ruprecht_16.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).