CWNU 203

0.18 UTI

0.0

C_N

0.29

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], 1.4 [pc^-2]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.29 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 203 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the age 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 High extinction Near-solar metallicity Very young

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.07 (50th percentile), false positive? (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.07 (50th percentile), false positive? (human-assigned).

Data

🔍 Search references for CWNU 203 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–	10.115	66.884	0.369	-3.091	0.237	–
Hunt & Reffert	2024	10.132	66.892	0.369	-3.088	0.238	–
Cavallo et al.	2024	10.142	66.898	0.369	–	–	–
Hunt & Reffert	2023	10.132	66.892	0.369	-3.088	0.238	–
He et al.	2022	10.115	66.885	0.37	-3.08	0.24	–

💡 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–	2.54	3.305	2.64	14	0.347	564	–	–
Hunt & Reffert	2024	2.44	3.25	2.64	14	–	564⁽¹⁾	–	–
Cavallo et al.	2024	2.64	3.36	–	69	0.400	–	–	–
Hunt & Reffert	2023	2.44	3.25	2.64	14	–	–	–	–
He et al.	2022	3.31	4.12	–	5	0.295	–	–	–

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

Visualization

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