CWNU 539

(OCSN 161)

0.04 UTI

0.3

C_N

0.22

C_dens

0.38

C_C3

0.0

C_lit

0.2

C_dup

N_m (P>50%) 30

Core radius and density 1.6 [pc], 1.1 [pc^-2]

C3 classification CB

C_N 0.3 Poorly populated
C_dens 0.22 Very loose
C_C3 0.38 Low quality
C_lit 0.0 Rarely studied
C_dup 0.2 Likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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CWNU 539 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a very close 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 age parameter (see Parameters). It is rarely studied in the literature.

⚠️ Warning: This is likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=0.2) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Very close Low extinction Near-solar metallicity Intermediate age

Data

🔍 Search references for CWNU 539 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–	103.785	-37.565	2.227	-8.944	10.485	29.394
Qin et al.	2023	103.83	-37.6	2.18	-8.61	10.32	28.63
He et al.	2022	103.814	-37.54	2.22	-8.94	10.48	27.1

💡 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	0.395	–	150	-0.404	–	–	–
Qin et al.	2023	0.56	0.54	–	251	–	–	–	–
He et al.	2022	0.36	0.25	–	50	-0.404	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Theia 249	80.0	103.76	-37.56	2.23	-8.87	10.52	28.76	0.21

💡 Note: The % column shows the percentage of members that CWNU 539 shares with each listed object.

Visualization

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