CWNU 1757

0.27 UTI

0.34

C_N

0.15

C_dens

0.5

C_C3

0.19

C_lit

1.0

C_dup

N_m (P>50%) 34

Core radius and density 2.4 [pc], 0.8 [pc^-2]

C3 classification BB

C_N 0.34 Poorly populated
C_dens 0.15 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.19 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 1757 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, old cluster (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 Moderate extinction Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.57 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.57 (50th percentile).

Data

🔍 Search references for CWNU 1757 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–	304.419	48.07	0.398	-2.966	-5.333	-50.72
Hu & Soubiran	2025	304.434	48.031	–	–	–	–
Hunt & Reffert	2024	304.426	48.071	0.394	-2.922	-5.258	-38.916
Cavallo et al.	2024	304.434	48.031	0.399	–	–	–
Hunt & Reffert	2023	304.426	48.071	0.394	-2.922	-5.258	-38.916
He et al.	2023	304.438	48.057	0.399	-2.989	-5.355	-49.98

💡 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–	2.3	2.065	1.38	1021	0.170	170	–	–
Hu & Soubiran	2025	–	–	–	–	0.040⁽⁵⁾	–	–	–
Hunt & Reffert	2024	2.31	2.11	1.38	920	–	170⁽¹⁾	–	–
Cavallo et al.	2024	2.14	2.02	–	1122	0.300	–	–	–
Hunt & Reffert	2023	2.31	2.11	1.38	920	–	–	–	–
He et al.	2023	2.29	1.90	–	1778	–	–	–	–

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

Visualization

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