CWNU 77

0.21 UTI

0.0

C_N

0.06

C_dens

0.5

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 21

Stellar density (N₅₀/rad) 0.3 [N/pc²]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.06 Very loose
C_C3 0.5 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 77 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low extinction. It is catalogued as a metal-rich, intermediate-age cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is poorly 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 Metal-rich Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 52 along with HSC_1082, and of multiple system 22 along with UBC_415, FSR_0569 and HSC_1082.

Palma et al. (2025)
Part of multiple system G85, along with HSC_1052, HSC_1082, FSR_0569 and UBC_415.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for CWNU 77 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–	45.292	71.634	1.18	-1.078	0.05	-11.798
Liu et al.	2025	45.33	71.08	1.17	-1.2	0.0	-16.85
Cavallo et al.	2024	42.159	71.954	1.172	–	–	–
Hunt & Reffert	2023	45.331	71.078	1.174	-1.199	-0.004	-16.849
He et al.	2022	44.648	71.806	1.17	-1.07	0.07	35.6

💡 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–	0.875	0.9	1.8	122	0.844	–	–	–
Liu et al.	2025	1.09	0.29	–	166	–	–	–	–
Cavallo et al.	2024	0.90	0.91	–	178	0.720	–	–	–
Hunt & Reffert	2023	0.81	0.89	1.80	71	–	–	–	–
He et al.	2022	0.85	1.02	–	79	0.968	–	–	–

Visualization

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