CWNU 1631

0.21 UTI

0.3

C_N

0.2

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 30

Core radius and density 1.5 [pc], 1.0 [pc^-2]

C3 classification BB

C_N 0.3 Poorly populated
C_dens 0.2 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.03 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 1631 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by low extinction. It is catalogued as an 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.

Distant Low extinction Intermediate age

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for CWNU 1631 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–	121.905	-30.886	0.236	-2.524	3.636	69.555
Hunt & Reffert	2024	121.906	-30.879	0.243	-2.517	3.642	–
Hunt & Reffert	2023	121.906	-30.879	0.243	-2.517	3.642	–
He et al.	2023	121.924	-30.879	0.258	-2.538	3.633	76.16

💡 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–	3.8	0.6	0.65	281	–	290	–	–
Hunt & Reffert	2024	3.80	0.60	0.65	280	–	290⁽¹⁾	–	–
Hunt & Reffert	2023	3.80	0.60	0.65	281	–	–	–	–
He et al.	2023	4.37	0.90	–	562	–	–	–	–

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

Visualization

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