CWNU 80

0.24 UTI

0.31

C_N

0.08

C_dens

0.5

C_C3

0.16

C_lit

1.0

C_dup

N_m (P>50%) 31

Core radius and density 3.5 [pc], 0.4 [pc^-2]

C3 classification BB

C_N 0.31 Poorly populated
C_dens 0.08 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.16 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 80 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a low-mass, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is rarely studied 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.

Close Low extinction Low mass Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 53 along with Theia_282.

Palma et al. (2025)
Classified as optical pair P114, along with Theia_282.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.83 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.83 (50th percentile).

Data

🔍 Search references for CWNU 80 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–	93.855	11.945	1.3	-1.913	-4.505	11.231
Yang et al.	2025	93.96	11.891	–	–	–	–
Zhang et al.	2024	93.96	11.891	–	–	–	–
Hunt & Reffert	2024	93.96	11.891	1.293	-1.844	-4.497	5.246
Cavallo et al.	2024	93.424	12.373	1.292	–	–	–
Hunt & Reffert	2023	93.96	11.891	1.293	-1.844	-4.497	5.246
He et al.	2022	93.779	11.874	1.28	-1.91	-4.46	–

💡 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–	0.77	0.3	1.07	118	0.068	49	–	–
Liu et al.	2025	0.77	0.10	–	93	–	–	–	–
Yang et al.	2025	–	–	–	123	-0.130⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	0.026⁽¹⁾	–	–	–
Hunt & Reffert	2024	0.74	0.30	1.07	123	–	49⁽¹⁾	–	–
Cavallo et al.	2024	0.80	0.44	–	112	0.110	–	–	–
Hunt & Reffert	2023	0.74	0.30	1.07	123	–	–	–	–
He et al.	2022	0.78	0.44	–	63	0.198	–	–	–

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

Visualization

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