CWNU 281

0.49 UTI

0.34

C_N

1.0

C_dens

0.62

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 34

Stellar density (N₅₀/rad) 9.9 [N/pc²]

C3 classification AC

C_N 0.34 Poorly populated
C_dens 1.0 Very dense
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 281 is a poorly populated, very dense object of intermediate C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by moderate extinction. It is catalogued as an extremely metal-poor, very young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is poorly studied in the literature.

Relatively close Moderate extinction Extremely metal-poor Very young

Liu et al. (2025)
Classified as primordial binary cluster 65 along with Alessi_72, and of multiple system 12 along with Alessi_72 and HSC_1808.

Data

🔍 Search references for CWNU 281 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–	106.022	-16.325	0.721	-2.775	1.377	42.07
Liu et al.	2025	106.04	-16.35	0.73	-2.75	1.44	22.8
Hunt & Reffert	2024	106.039	-16.352	0.728	-2.749	1.438	22.803
Hunt & Reffert	2023	106.039	-16.352	0.728	-2.749	1.438	22.803
He et al.	2022	106.016	-16.342	0.67	-2.66	1.34	–

💡 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–	1.31	1.08	0.59	10	-2.028	72	–	–
Liu et al.	2025	1.75	0.34	–	10	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	72⁽¹⁾	–	–
Hunt & Reffert	2023	1.31	1.34	0.59	10	–	–	–	–
He et al.	2022	1.20	1.08	–	8	-2.028	–	–	–

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

Visualization

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