CWNU 2438

0.12 UTI

0.0

C_N

0.08

C_dens

0.38

C_C3

0.1

C_lit

0.92

C_dup

N_m (P>50%) 20

Core radius and density 2.5 [pc], 0.4 [pc^-2]

C3 classification CB

C_N 0.0 Sparse
C_dens 0.08 Very loose
C_C3 0.38 Low quality
C_lit 0.1 Rarely studied
C_dup 0.92 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

ℹ️

CWNU 2438 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high 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 was recently reported in the literature.

Note: This is very likely a unique object, which shares a very small percentage of members with at least one previously reported entry. See table with shared members information.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=0.92) 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 Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Data

🔍 Search references for CWNU 2438 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	318.423	49.007	0.334	-3.248	-4.747	-42.313
Hu & Soubiran	2025	318.421	49.005	–	–	–	–
Hunt & Reffert	2024	318.37	49.002	0.344	-3.245	-4.711	-42.36
Cavallo et al.	2024	318.421	49.005	0.344	–	–	–
Hunt & Reffert	2023	318.37	49.002	0.344	-3.245	-4.711	-42.36
He et al.	2023	318.386	49.004	0.332	-3.235	-4.76	-40.16

💡 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–	2.66	3.89	1.22	494	0.160	377	–	–
Hu & Soubiran	2025	–	–	–	–	-0.030⁽⁵⁾	–	–	–
Hunt & Reffert	2024	2.69	3.89	1.22	488	–	377⁽¹⁾	–	–
Cavallo et al.	2024	2.49	3.08	–	1175	0.350	–	–	–
Hunt & Reffert	2023	2.69	3.89	1.22	488	–	–	–	–
He et al.	2023	2.63	3.90	–	501	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Bica 159	8.0	318.81	48.88	0.27	-3.23	-4.78	–	0.04

💡 Note: The % column shows the percentage of members that CWNU 2438 shares with each listed object.

Visualization

ℹ️

1 2