CWNU 2256

0.14 UTI

0.25

C_N

0.14

C_dens

0.12

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 25

Core radius and density 1.9 [pc], 0.7 [pc^-2]

C3 classification DC

C_N 0.25 Poorly populated
C_dens 0.14 Very loose
C_C3 0.12 Very low quality
C_lit 0.1 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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CWNU 2256 is a poorly populated, very loose object of very low 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 (see Parameters). It was recently reported in the literature.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.91 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.91 (50th percentile).

Data

🔍 Search references for CWNU 2256 in: SciX Simbad

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Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	331.298	54.248	0.444	-4.659	-4.598	-75.819
Hu & Soubiran	2025	331.275	54.227	–	–	–	–
Hunt & Reffert	2024	331.322	54.235	0.435	-4.627	-4.587	-75.823
Cavallo et al.	2024	331.275	54.227	0.437	–	–	–
Hunt & Reffert	2023	331.322	54.235	0.435	-4.627	-4.587	-75.823
He et al.	2023	331.31	54.239	0.44	-4.654	-4.598	–

💡 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]	B_frac	BSS
UCC	99999–	2.195	2.27	0.9	303	0.055	101	–	–
Hu & Soubiran	2025	–	–	–	–	-0.030⁽⁵⁾	–	–	–
Hunt & Reffert	2024	2.15	2.23	0.90	208	–	101⁽¹⁾	–	–
Cavallo et al.	2024	2.24	2.31	–	661	0.140	–	–	–
Hunt & Reffert	2023	2.15	2.23	0.90	208	–	–	–	–
He et al.	2023	2.51	2.70	–	398	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Visualization

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