CWNU 1281

0.33 UTI

0.35

C_N

0.22

C_dens

0.5

C_C3

0.3

C_lit

1.0

C_dup

N₅₀ (P>50% members) 35

Stellar density (N₅₀/rad) 1.1 [N/pc²]

C3 classification BB

C_N 0.35 Poorly populated
C_dens 0.22 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.3 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 1281 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It was recently reported in the literature.

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

Relatively close Low extinction Near-solar metallicity Young

Palma et al. (2025)
Part of multiple system G40, along with HSC_1641, CWNU_158, HSC_1636 and Collinder_104.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for CWNU 1281 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–	100.676	4.726	0.643	-1.964	0.794	–
Zhang et al.	2024	100.645	4.728	–	–	–	–
Hunt & Reffert	2024	100.645	4.728	0.641	-1.959	0.798	–
Cavallo et al.	2024	100.633	4.7	0.639	–	–	–
Hunt & Reffert	2023	100.645	4.728	0.641	-1.959	0.798	–
He et al.	2023	100.62	4.753	0.644	-1.972	0.816	–

💡 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–	1.48	0.95	0.87	58	0.051	170	–	–
Zhang et al.	2024	–	–	–	–	-0.089⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	170⁽¹⁾	–	–
Cavallo et al.	2024	1.51	0.95	–	58	0.190	–	–	–
Hunt & Reffert	2023	1.47	0.91	0.87	69	–	–	–	–
He et al.	2023	1.48	1.10	–	40	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
HSC 1636	5.7	99.85	4.94	0.64	-2.04	0.75	28.99	0.05

💡 Note: The % column shows the percentage of members that CWNU 1281 shares with each listed object.

Visualization

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