CWNU 1684

0.26 UTI

0.0

C_N

0.32

C_dens

0.5

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 23

Stellar density (N₅₀/rad) 1.6 [N/pc²]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.32 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 1684 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It was recently reported in the literature.

Relatively close Moderate extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as primordial binary cluster 109 along with HSC_1421.

Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P8, along with HSC_1421.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for CWNU 1684 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–	85.407	28.2	0.61	1.007	-1.931	–
Zhang et al.	2024	85.359	28.197	–	–	–	–
Hunt & Reffert	2024	85.359	28.197	0.62	1.012	-1.937	–
Cavallo et al.	2024	85.375	28.173	0.62	–	–	–
Hunt & Reffert	2023	85.359	28.197	0.62	1.012	-1.937	–
He et al.	2023	85.42	28.169	0.62	1.01	-1.934	–

💡 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–	1.625	1.595	1.38	66	0.148	219	–	–
Liu et al.	2025	2.90	0.56	–	56	–	–	–	–
Zhang et al.	2024	–	–	–	–	-0.263⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	219⁽¹⁾	–	–
Cavallo et al.	2024	1.67	1.49	–	174	0.560	–	–	–
Hunt & Reffert	2023	1.51	1.73	1.38	76	–	–	–	–
He et al.	2023	1.58	1.70	–	20	–	–	–	–

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

Visualization

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