CWNU 2890

0.20 UTI

0.0

C_N

0.39

C_dens

0.5

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 0.9 [pc], 1.9 [pc^-2]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.39 Loose
C_C3 0.5 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 2890 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by high 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 High extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P365, along with UFMG_82.

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.41 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.41 (50th percentile).

Data

🔍 Search references for CWNU 2890 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–	262.398	-34.329	0.606	1.976	0.163	112.425
Hunt & Reffert	2024	262.423	-34.321	0.599	1.873	0.176	112.443
Cavallo et al.	2024	262.387	-34.321	0.597	–	–	–
Hunt & Reffert	2023	262.423	-34.321	0.599	1.873	0.176	112.443
He et al.	2023	262.41	-34.314	0.614	1.968	0.218	–

💡 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–	1.58	4.22	2.55	86	-0.300	297	–	–
Hunt & Reffert	2024	1.58	4.07	2.55	30	–	297⁽¹⁾	–	–
Cavallo et al.	2024	1.86	4.37	–	141	-0.300	–	–	–
Hunt & Reffert	2023	1.58	4.07	2.55	30	–	–	–	–
He et al.	2023	1.51	4.60	–	158	–	–	–	–

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

Visualization

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