CWNU 518

0.18 UTI

0.0

C_N

0.07

C_dens

0.5

C_C3

0.16

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 3.0 [pc], 0.3 [pc^-2]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.07 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.16 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 518 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is rarely studied 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.

Close Low extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Data

🔍 Search references for CWNU 518 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–	74.481	42.246	1.006	0.426	-2.878	-11.823
Yang et al.	2025	74.409	42.238	–	–	–	–
Zhang et al.	2024	74.409	42.238	–	–	–	–
Hunt & Reffert	2024	74.409	42.238	0.985	0.448	-2.868	-21.319
Cavallo et al.	2024	74.5	42.222	0.996	–	–	–
Hunt & Reffert	2023	74.409	42.238	0.985	0.448	-2.868	-21.319
He et al.	2022	74.443	42.196	1.007	0.404	-2.883	–
He et al.	2022	74.508	42.207	1.0	0.41	-2.88	–

💡 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–	0.95	0.7	0.61	84	-0.192	68	–	–
Yang et al.	2025	–	–	–	96	-0.060⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.174⁽¹⁾	–	–	–
Hunt & Reffert	2024	0.95	0.53	0.61	95	–	68⁽¹⁾	–	–
Cavallo et al.	2024	1.00	0.85	–	74	-0.210	–	–	–
Hunt & Reffert	2023	0.95	0.53	0.61	95	–	–	–	–
He et al.	2022	–	0.70	–	40	–	–	–	–
He et al.	2022	0.78	0.95	–	32	-0.881	–	–	–

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

Visualization

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