Theia 569

0.21 UTI

0.0

C_N

0.13

C_dens

0.75

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 2.1 [pc], 0.6 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.13 Very loose
C_C3 0.75 High quality
C_lit 0.1 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Theia 569 is a sparse, very loose object of high C3 quality. Its parallax locates it at a close distance, near 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 metallicity parameter (see Parameters). It is rarely studied in the literature.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

⚠️ 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.

Close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for Theia 569 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–	72.555	44.822	1.327	2.039	-6.361	3.863
Yang et al.	2025	72.402	44.833	–	–	–	–
Zhang et al.	2024	72.402	44.833	–	–	–	–
Cavallo et al.	2024	72.558	44.692	1.328	–	–	–
Hunt & Reffert	2023	72.402	44.833	1.319	2.072	-6.377	0.714
Kounkel & Covey	2019	72.762	44.873	1.303	–	–	-12.482

💡 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–	0.75	1.06	0.61	235	-0.180	–	–	–
Yang et al.	2025	–	–	–	234	-0.180⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.316⁽¹⁾	–	–	–
Cavallo et al.	2024	0.75	0.89	–	275	0.320	–	–	–
Hunt & Reffert	2023	0.70	1.06	0.61	236	–	–	–	–
Kounkel & Covey	2019	0.77	1.21	–	201	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 4066	92.0	72.56	44.84	1.35	2.04	-6.36	3.69	0.01

💡 Note: The % column shows the percentage of members that Theia 569 shares with each listed object.

Visualization

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