CWNU 2259

0.24 UTI

0.0

C_N

0.06

C_dens

0.62

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 22

Stellar density (N₅₀/rad) 0.3 [N/pc²]

C3 classification AC

C_N 0.0 Sparse
C_dens 0.06 Very loose
C_C3 0.62 Intermediate quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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CWNU 2259 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, below 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 absorption and age parameters (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 Low extinction Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as primordial binary cluster 114 along with Ruprecht_16.

Palma et al. (2025)
Classified as optical pair P200, along with Ruprecht_16.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for CWNU 2259 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–	110.893	-18.427	0.32	-2.424	2.998	–
Cavallo et al.	2024	110.837	-18.396	0.318	–	–	–
Hunt & Reffert	2023	110.802	-18.634	0.319	-2.427	3.003	–
He et al.	2023	111.021	-18.349	0.316	-2.387	2.97	64.21

💡 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–	2.94	0.89	0.96	159	-0.320	–	–	–
Liu et al.	2025	3.80	0.26	–	162	–	–	–	–
Cavallo et al.	2024	2.74	1.11	–	85	-0.320	–	–	–
Hunt & Reffert	2023	2.86	0.78	0.96	156	–	–	–	–
He et al.	2023	3.02	1.00	–	562	–	–	–	–

Visualization

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