CWNU 240

0.09 UTI

0.0

C_N

0.17

C_dens

0.12

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 23

Core radius and density 1.4 [pc], 0.9 [pc^-2]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.17 Very loose
C_C3 0.12 Very 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 240 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a relatively close distance, near 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 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 Low extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P348, along with HSC_1676.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for CWNU 240 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–	102.533	0.912	0.785	-1.099	-1.053	29.37
Hunt & Reffert	2024	102.538	0.957	0.761	-1.102	-1.017	29.369
Cavallo et al.	2024	102.544	0.91	0.762	–	–	–
Hunt & Reffert	2023	102.538	0.957	0.761	-1.102	-1.017	29.369
He et al.	2022	102.536	0.82	0.8	-1.16	-1.05	–

💡 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–	1.225	0.715	0.56	192	-0.227	102	–	–
Hunt & Reffert	2024	1.23	0.54	0.56	256	–	102⁽¹⁾	–	–
Cavallo et al.	2024	1.22	0.89	–	129	-0.050	–	–	–
Hunt & Reffert	2023	1.23	0.54	0.56	256	–	–	–	–
He et al.	2022	1.12	1.14	–	100	-0.404	–	–	–

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

Visualization

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