CWNU 1227
0.22
UTI
0.26
CN
0.07
Cdens
0.5
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%)
26
Core radius and density
3.2 [pc], 0.4 [pc-2]
- CN 0.26 Poorly populated
- Cdens 0.07 Very loose
- CC3 0.5 Intermediate quality
- Clit 0.13 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 1227 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption and age 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 | 94.224 | -7.796 | 2.444 | -3.693 | 0.257 | 15.773 |
| Liu et al. | 2025 | 94.61 | -7.78 | 2.5 | -3.93 | -0.16 | 30.61 |
| Yang et al. | 2025 | 94.614 | -7.781 | â | â | â | â |
| Zhang et al. | 2024 | 94.614 | -7.781 | â | â | â | â |
| Cavallo et al. | 2024 | 94.817 | -7.485 | 2.495 | â | â | â |
| Hunt & Reffert | 2023 | 94.614 | -7.781 | 2.496 | -3.932 | -0.157 | 30.609 |
| He et al. | 2022 | 94.585 | -7.847 | 2.436 | -3.929 | 1.259 | 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 | 0.41 | 0.35 | 0.48 | 12 | -0.247 | â | â | â |
| Liu et al. | 2025 | 0.42 | 0.06 | â | 29 | â | â | â | â |
| Yang et al. | 2025 | â | â | â | 12 | -0.150(3) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.247(1) | â | â | â |
| Cavallo et al. | 2024 | 0.41 | 0.56 | â | 9 | -0.320 | â | â | â |
| Hunt & Reffert | 2023 | 0.40 | 0.14 | 0.48 | 11 | â | â | â | â |
| He et al. | 2022 | â | 1.00 | â | 316 | 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 72 along with CWNU_410, and of multiple system 25 along with OCSN_76 and CWNU_410.
Palma et al. (2025)
Part of multiple system G125, along with HSC_1719 and HSC_1687.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).