CWNU 281
0.38
UTI
0.34
CN
0.8
Cdens
0.62
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
34
Core radius and density
0.8 [pc], 4.0 [pc-2]
- CN 0.34 Poorly populated
- Cdens 0.8 Dense
- 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 281 is a poorly populated, dense object of intermediate C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a metal-poor, very young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is rarely studied in the literature.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 106.022 | -16.325 | 0.721 | -2.775 | 1.377 | 42.07 |
| Liu et al. | 2025 | 106.04 | -16.35 | 0.73 | -2.75 | 1.44 | 22.8 |
| Hunt & Reffert | 2024 | 106.039 | -16.352 | 0.728 | -2.749 | 1.438 | 22.803 |
| Hunt & Reffert | 2023 | 106.039 | -16.352 | 0.728 | -2.749 | 1.438 | 22.803 |
| He et al. | 2022 | 106.016 | -16.342 | 0.67 | -2.66 | 1.34 | 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 | 1.31 | 1.24 | 0.59 | 10 | -0.881 | 72 | â | â |
| Liu et al. | 2025 | 1.75 | 0.34 | â | 10 | â | â | â | â |
| Hunt & Reffert | 2024 | 1.31 | 1.34 | 0.59 | 10 | â | 72(1) | â | â |
| Hunt & Reffert | 2023 | 1.31 | 1.34 | 0.59 | 10 | â | â | â | â |
| He et al. | 2022 | 1.20 | 1.14 | â | 8 | -0.881 | 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 65 along with Alessi_72, and of multiple system 12 along with Alessi_72 and HSC_1808.
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).