CWNU 1758

0.19 UTI

0.0

C_N

0.13

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 20

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

C3 classification BA

C_N 0.0 Sparse
C_dens 0.13 Very loose
C_C3 0.75 High quality
C_lit 0.03 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 1758 is a sparse, very loose object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a 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 High extinction Young

Palma et al. (2025)
Classified as optical pair P328, along with UBC_558.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.89 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.89 (50th percentile).

Data

🔍 Search references for CWNU 1758 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–	259.075	-39.92	0.348	-1.768	-3.764	-26.635
Hunt & Reffert	2024	259.082	-39.914	0.344	-1.781	-3.739	-32.549
Hunt & Reffert	2023	259.082	-39.914	0.344	-1.781	-3.739	-32.549
He et al.	2023	259.089	-39.915	0.35	-1.763	-3.762	–

💡 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–	2.57	3.73	1.26	63	–	425	–	–
Hunt & Reffert	2024	2.57	3.73	1.26	63	–	425⁽¹⁾	–	–
Hunt & Reffert	2023	2.57	3.73	1.26	63	–	–	–	–
He et al.	2023	2.95	4.40	–	6	–	–	–	–

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

Visualization

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