CWNU 1684
0.21
UTI
0.0
CN
0.06
Cdens
0.5
CC3
0.25
Clit
1.0
Cdup
Nm (P>50%)
23
Core radius and density
3.2 [pc], 0.3 [pc-2]
- CN 0.0 Sparse
- Cdens 0.06 Very loose
- CC3 0.5 Intermediate quality
- Clit 0.25 Poorly 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 1684 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate 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 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 | 85.407 | 28.2 | 0.61 | 1.007 | -1.931 | â |
| Zhang et al. | 2024 | 85.359 | 28.197 | â | â | â | â |
| Hunt & Reffert | 2024 | 85.359 | 28.197 | 0.62 | 1.012 | -1.937 | â |
| Cavallo et al. | 2024 | 85.375 | 28.173 | 0.62 | â | â | â |
| Hunt & Reffert | 2023 | 85.359 | 28.197 | 0.62 | 1.012 | -1.937 | â |
| He et al. | 2023 | 85.42 | 28.169 | 0.62 | 1.01 | -1.934 | 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 | 1.58 | 1.7 | 1.38 | 76 | 0.148 | 219 | â | â |
| Liu et al. | 2025 | 2.90 | 0.56 | â | 56 | â | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.263(1) | â | â | â |
| Hunt & Reffert | 2024 | 1.51 | 1.73 | 1.38 | 76 | â | 219(1) | â | â |
| Cavallo et al. | 2024 | 1.67 | 1.49 | â | 174 | 0.560 | â | â | â |
| Hunt & Reffert | 2023 | 1.51 | 1.73 | 1.38 | 76 | â | â | â | â |
| He et al. | 2023 | 1.58 | 1.70 | â | 20 | 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 109 along with HSC_1421.
Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P8, along with HSC_1421.
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).