CWNU 218
0.21
UTI
0.0
CN
0.13
Cdens
0.75
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
24
Core radius and density
2.1 [pc], 0.6 [pc-2]
- CN 0.0 Sparse
- Cdens 0.13 Very loose
- CC3 0.75 High 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
CWNU 218 is a sparse, very loose object of high C3 quality. Its parallax locates it at a relatively close 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 age 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 | 244.918 | -55.615 | 0.717 | 0.002 | -1.487 | -15.83 |
| Hunt & Reffert | 2024 | 244.901 | -55.617 | 0.719 | -0.007 | -1.497 | -20.265 |
| Cavallo et al. | 2024 | 244.962 | -55.614 | 0.714 | â | â | â |
| Hunt & Reffert | 2023 | 244.901 | -55.617 | 0.719 | -0.007 | -1.497 | -20.265 |
| He et al. | 2022 | 244.964 | -55.625 | 0.68 | -0.04 | -1.46 | -8.3 |
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 | 1.37 | 0.84 | 0.7 | 307 | 0.405 | 274 | â | â |
| Liu et al. | 2025 | 2.73 | 0.49 | â | 126 | â | â | â | â |
| Hunt & Reffert | 2024 | 1.32 | 0.84 | 0.70 | 307 | â | 274(1) | â | â |
| Cavallo et al. | 2024 | 1.37 | 0.72 | â | 468 | 0.460 | â | â | â |
| Hunt & Reffert | 2023 | 1.32 | 0.84 | 0.70 | 308 | â | â | â | â |
| He et al. | 2022 | 1.74 | 1.27 | â | 126 | 0.350 | 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 63 along with FoF_2210.
Palma et al. (2025)
Classified as optical pair P252, along with FoF_2210.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).