CWNU 2255

0.20 UTI

0.0

C_N

0.04

C_dens

0.75

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 17

Core radius and density 3.0 [pc], 0.2 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.04 Very loose
C_C3 0.75 High quality
C_lit 0.1 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 2255 is a sparse, very loose object of high C3 quality. Its parallax locates it at a moderate distance, well above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age 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.

Distant Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.48 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.48 (50th percentile).

Data

🔍 Search references for CWNU 2255 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–	76.43	55.764	0.275	-0.803	-1.179	-30.231
Hu & Soubiran	2025	76.439	55.754	–	–	–	–
Hunt & Reffert	2024	76.427	55.766	0.277	-0.785	-1.194	-30.385
Cavallo et al.	2024	76.439	55.754	0.277	–	–	–
Hunt & Reffert	2023	76.427	55.766	0.277	-0.785	-1.194	-30.385
He et al.	2023	76.419	55.757	0.275	-0.788	-1.179	-30.16

💡 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–	3.26	2.05	1.29	648	0.090	226	–	–
Hu & Soubiran	2025	–	–	–	–	0.050⁽⁵⁾	–	–	–
Hunt & Reffert	2024	3.26	2.05	1.29	648	–	226⁽¹⁾	–	–
Cavallo et al.	2024	3.50	2.10	–	603	0.130	–	–	–
Hunt & Reffert	2023	3.26	2.05	1.29	647	–	–	–	–
He et al.	2023	3.16	1.90	–	891	–	–	–	–

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

Visualization

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