CWNU 1777

0.21 UTI

0.29

C_N

0.2

C_dens

0.38

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 29

Core radius and density 1.0 [pc], 1.0 [pc^-2]

C3 classification CB

C_N 0.29 Poorly populated
C_dens 0.2 Very loose
C_C3 0.38 Low quality
C_lit 0.1 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 1777 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It was recently reported 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.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.12 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.12 (50th percentile).

Data

🔍 Search references for CWNU 1777 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–	243.92	-50.413	0.443	-2.33	-3.921	-81.51
Hu & Soubiran	2025	243.921	-50.396	–	–	–	–
Hunt & Reffert	2024	243.892	-50.37	0.439	-2.336	-3.925	-81.173
Cavallo et al.	2024	243.921	-50.396	0.436	–	–	–
Hunt & Reffert	2023	243.892	-50.37	0.439	-2.336	-3.925	-81.173
He et al.	2023	243.947	-50.42	0.432	-2.32	-3.921	-81.51

💡 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–	2.2	2.52	1.85	591	0.005	361	–	–
Hu & Soubiran	2025	–	–	–	–	-0.130⁽⁵⁾	–	–	–
Hunt & Reffert	2024	2.08	2.41	1.85	551	–	361⁽¹⁾	–	–
Cavallo et al.	2024	2.32	2.63	–	977	0.140	–	–	–
Hunt & Reffert	2023	2.08	2.41	1.85	551	–	–	–	–
He et al.	2023	2.51	3.15	–	631	–	–	–	–

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

Visualization

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