CWNU 209

0.13 UTI

0.0

C_N

0.13

C_dens

0.38

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 23

Core radius and density 2.2 [pc], 0.7 [pc^-2]

C3 classification CB

C_N 0.0 Sparse
C_dens 0.13 Very loose
C_C3 0.38 Low quality
C_lit 0.06 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 209 is a sparse, very loose object of low 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, intermediate-age 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.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

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

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

Data

🔍 Search references for CWNU 209 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–	337.643	56.127	0.712	-2.195	-1.711	-39.864
Hunt & Reffert	2024	337.582	56.099	0.719	-2.203	-1.725	-44.96
Cavallo et al.	2024	337.692	56.17	0.716	–	–	–
Hunt & Reffert	2023	337.582	56.099	0.719	-2.203	-1.725	-44.96
He et al.	2022	337.727	56.176	0.72	-2.2	-1.71	–

💡 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–	1.36	1.41	1.59	163	0.101	137	–	–
Hunt & Reffert	2024	1.36	1.29	1.59	163	–	137⁽¹⁾	–	–
Cavallo et al.	2024	1.43	1.53	–	170	0.480	–	–	–
Hunt & Reffert	2023	1.36	1.29	1.59	163	–	–	–	–
He et al.	2022	1.17	1.65	–	50	-0.279	–	–	–

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

Visualization

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