CWNU 1998

0.28 UTI

0.0

C_N

0.27

C_dens

1.0

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 21

Core radius and density 1.3 [pc], 1.3 [pc^-2]

C3 classification AA

C_N 0.0 Sparse
C_dens 0.27 Loose
C_C3 1.0 Very high quality
C_lit 0.06 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 1998 is a sparse, loose object of very high C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a metal-poor, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It was recently reported in the literature.

Relatively close Moderate extinction Metal-poor Intermediate age

Palma et al. (2025)
Classified as optical pair P337, along with HSC_2961.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Data

🔍 Search references for CWNU 1998 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–	267.477	-33.376	0.635	0.035	-1.986	–
Hunt & Reffert	2024	267.466	-33.335	0.639	0.068	-1.922	–
Cavallo et al.	2024	267.491	-33.361	0.642	–	–	–
Hunt & Reffert	2023	267.466	-33.335	0.639	0.068	-1.922	–
He et al.	2023	267.466	-33.363	0.654	0.02	-2.017	–

💡 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–	1.42	2.34	1.78	106	-0.720	261	–	–
Hunt & Reffert	2024	1.42	2.34	1.78	106	–	261⁽¹⁾	–	–
Cavallo et al.	2024	1.06	3.10	–	25	-0.720	–	–	–
Hunt & Reffert	2023	1.42	2.34	1.78	106	–	–	–	–
He et al.	2023	1.48	2.25	–	200	–	–	–	–

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

Visualization

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