CWNU 1909

0.23 UTI

0.26

C_N

0.13

C_dens

0.5

C_C3

0.12

C_lit

1.0

C_dup

N_m (P>50%) 26

Core radius and density 2.7 [pc], 0.7 [pc^-2]

C3 classification BB

C_N 0.26 Poorly populated
C_dens 0.13 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.12 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 1909 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age 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 Intermediate age

Cavallo et al. (2024)
Gold sample.

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 1909 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–	24.915	57.488	0.555	-0.981	-1.696	–
Hunt & Reffert	2024	24.889	57.449	0.538	-0.961	-1.682	–
Cavallo et al.	2024	24.923	57.492	0.544	–	–	–
Hunt & Reffert	2023	24.889	57.449	0.538	-0.961	-1.682	–
He et al.	2023	24.936	57.489	0.557	-0.974	-1.681	–

💡 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–	1.7	1.44	1.22	103	-0.060	118	–	–
Hunt & Reffert	2024	1.70	1.44	1.22	103	–	118⁽¹⁾	–	–
Cavallo et al.	2024	1.62	1.34	–	275	-0.060	–	–	–
Hunt & Reffert	2023	1.70	1.44	1.22	103	–	–	–	–
He et al.	2023	1.70	1.90	–	40	–	–	–	–

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

Visualization

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