CWNU 1656

0.21 UTI

0.0

C_N

0.17

C_dens

0.38

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 23

Stellar density (N₅₀/rad) 0.9 [N/pc²]

C3 classification CB

C_N 0.0 Sparse
C_dens 0.17 Very loose
C_C3 0.38 Low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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CWNU 1656 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a metal-rich, young cluster, but with a large variance across recent sources for the age parameter (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 Metal-rich Young

Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P7, along with SAI_90.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for CWNU 1656 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–	128.147	-41.417	0.421	-4.887	4.452	223.772
Hunt & Reffert	2024	128.134	-41.399	0.415	-4.878	4.493	–
Cavallo et al.	2024	128.013	-41.334	0.414	–	–	–
Hunt & Reffert	2023	128.134	-41.399	0.415	-4.878	4.493	–
He et al.	2023	128.134	-41.448	0.421	-4.88	4.467	–

💡 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–	2.28	2.78	1.75	35	0.640	167	–	–
Hunt & Reffert	2024	–	–	–	–	–	167⁽¹⁾	–	–
Cavallo et al.	2024	2.45	2.41	–	178	0.640	–	–	–
Hunt & Reffert	2023	2.28	2.78	1.75	25	–	–	–	–
He et al.	2023	2.19	3.15	–	35	–	–	–	–

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

Visualization

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