CWNU 2157

0.17 UTI

0.0

C_N

0.09

C_dens

0.25

C_C3

0.25

C_lit

1.0

C_dup

C3 classification DB

Number of members (P>50%) 22

Radius (P>50% members) 13.1 [arcmin]

C_N 0.0 Sparse
C_dens 0.09 Very loose
C_C3 0.25 Low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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CWNU 2157 is a sparse, very loose object of low 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.

⚠️ 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 Young

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for CWNU 2157 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	–	91.959	21.01	0.547	1.426	-2.42	61.28
Zhang et al.	2024	91.916	21.025	–	–	–	–
Cavallo et al.	2024	92.107	21.031	0.551	–	–	–
Hunt & Reffert	2023	91.916	21.025	0.549	1.447	-2.418	–
He et al.	2023	91.955	21.037	0.547	1.42	-2.435	61.28

💡 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]	Bfr	BSS
Zhang et al.	2024	–	–	–	–	-0.526*	–	–	–
Cavallo et al.	2024	1.89	1.26	–	447	-0.120	–	–	–
Hunt & Reffert	2023	1.69	0.98	0.55	63	–	–	–	–
He et al.	2023	1.91	1.40	–	9	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

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