CWNU 1256

0.35 UTI

0.26

C_N

1.0

C_dens

0.5

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 26

Stellar density (N₅₀/rad) 12.9 [N/pc²]

C3 classification BB

C_N 0.26 Poorly populated
C_dens 1.0 Very dense
C_C3 0.5 Intermediate quality
C_lit 0.0 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 1256 is a poorly populated, very dense object of intermediate C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a metal-rich, intermediate-age cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It is rarely studied in the literature.

Very close Moderate extinction Metal-rich Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 99 along with CWNU_1173, and of multiple system 36 along with CWNU_1173 and OCSN_89.

Palma et al. (2025)
Classified as genetic pair P196, along with CWNU_1173.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.90 (50th percentile).

Data

🔍 Search references for CWNU 1256 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–	187.984	-72.29	2.112	-13.36	-1.27	5.587
Liu et al.	2025	188.17	-72.3	2.12	-13.38	-1.33	3.96
Cavallo et al.	2024	187.373	-72.162	2.109	–	–	–
Hunt & Reffert	2023	188.167	-72.302	2.116	-13.384	-1.331	3.962
He et al.	2022	187.931	-72.289	2.117	-13.417	-1.254	–

💡 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–	0.46	1.085	1.19	130	0.600	–	–	–
Liu et al.	2025	0.47	0.19	–	186	–	–	–	–
Cavallo et al.	2024	0.46	0.98	–	288	0.600	–	–	–
Hunt & Reffert	2023	0.46	1.19	1.19	74	–	–	–	–
He et al.	2022	–	1.45	–	35	–	–	–	–

Visualization

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