CWNU 204

0.22 UTI

0.0

C_N

0.48

C_dens

0.5

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 0.9 [pc], 2.4 [pc^-2]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.48 Loose
C_C3 0.5 Intermediate 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 204 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (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 Low extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for CWNU 204 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–	121.073	-29.218	0.569	-3.701	2.84	56.587
Hunt & Reffert	2024	121.071	-29.215	0.563	-3.686	2.842	35.928
Cavallo et al.	2024	121.045	-29.219	0.56	–	–	–
Hunt & Reffert	2023	121.071	-29.215	0.563	-3.686	2.842	35.928
He et al.	2022	121.067	-29.212	0.55	-3.69	2.9	–

💡 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–	1.63	0.35	0.78	301	0.181	128	–	–
Hunt & Reffert	2024	1.63	0.32	0.78	398	–	128⁽¹⁾	–	–
Cavallo et al.	2024	1.79	0.60	–	204	0.340	–	–	–
Hunt & Reffert	2023	1.63	0.32	0.78	398	–	–	–	–
He et al.	2022	1.35	0.38	–	40	0.022	–	–	–

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

Visualization

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