CWNU 2888
0.18
UTI
0.0
CN
0.14
Cdens
0.5
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%)
22
Core radius and density
2.0 [pc], 0.7 [pc-2]
- CN 0.0 Sparse
- Cdens 0.14 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 2888 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the distance, 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 | 201.295 | -62.298 | 0.45 | -3.947 | -0.97 | -34.654 |
| Liu et al. | 2025 | 201.33 | -62.28 | 0.45 | -4.0 | -1.0 | -27.53 |
| Hu & Soubiran | 2025 | 201.202 | -62.303 | â | â | â | â |
| Hunt & Reffert | 2024 | 201.332 | -62.279 | 0.447 | -3.995 | -0.997 | -27.533 |
| Cavallo et al. | 2024 | 201.202 | -62.303 | 0.448 | â | â | â |
| Hunt & Reffert | 2023 | 201.332 | -62.279 | 0.447 | -3.995 | -0.997 | -27.533 |
| He et al. | 2023 | 201.281 | -62.303 | 0.453 | -3.944 | -0.985 | 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 | 2.09 | 2.08 | 2.51 | 222 | 0.000 | 368 | â | â |
| Liu et al. | 2025 | 6.67 | 0.90 | â | 102 | â | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.180(5) | â | â | â |
| Hunt & Reffert | 2024 | 2.09 | 2.08 | 2.51 | 222 | â | 368(1) | â | â |
| Cavallo et al. | 2024 | 1.89 | 1.80 | â | 776 | 0.180 | â | â | â |
| Hunt & Reffert | 2023 | 2.09 | 2.08 | 2.51 | 222 | â | â | â | â |
| He et al. | 2023 | 2.09 | 2.60 | â | 9 | 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 tidal capture (resonant trapping binary) 119 along with UBC_292, and as tidal capture (resonant trapping binary) 128 along with Collinder_272, and of multiple system 40 along with Collinder_272 and UBC_292.
Palma et al. (2025)
Classified as optical pair P364, along with UBC_292.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.80 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.80 (50th percentile).