CWNU 1816

0.24 UTI

0.28

C_N

0.14

C_dens

0.62

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 28

Core radius and density 1.8 [pc], 0.7 [pc^-2]

C3 classification CA

C_N 0.28 Poorly populated
C_dens 0.14 Very loose
C_C3 0.62 Intermediate 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 1816 is a poorly populated, very loose object of intermediate 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, young cluster, but with a large variance across recent sources for the age parameter (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 open cluster. CMD class: 0.86 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.86 (50th percentile).

Data

🔍 Search references for CWNU 1816 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–	156.21	-57.296	0.411	-5.839	2.249	–
Hunt & Reffert	2024	156.192	-57.278	0.411	-5.839	2.246	–
Cavallo et al.	2024	156.256	-57.322	0.411	–	–	–
Hunt & Reffert	2023	156.192	-57.278	0.411	-5.839	2.246	–
He et al.	2023	156.259	-57.314	0.415	-5.839	2.251	–

💡 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–	2.24	1.22	2.3	84	0.020	192	–	–
Hunt & Reffert	2024	2.24	1.22	2.30	84	–	192⁽¹⁾	–	–
Cavallo et al.	2024	2.22	1.01	–	468	0.020	–	–	–
Hunt & Reffert	2023	2.24	1.22	2.30	84	–	–	–	–
He et al.	2023	2.29	1.40	–	79	–	–	–	–

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

Visualization

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