Theia 560

0.13 UTI

0.28

C_N

0.03

C_dens

0.12

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 28

Core radius and density 3.0 [pc], 0.2 [pc^-2]

C3 classification DC

C_N 0.28 Poorly populated
C_dens 0.03 Very loose
C_C3 0.12 Very low 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 560 is a poorly populated, very loose object of very low C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low 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 significant 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 Low 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 560 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–	73.665	45.926	1.493	-1.293	-2.968	-7.69
Yang et al.	2025	73.595	45.869	–	–	–	–
Zhang et al.	2024	73.595	45.869	–	–	–	–
Cavallo et al.	2024	73.479	46.254	1.509	–	–	–
Hunt & Reffert	2023	73.595	45.869	1.51	-1.283	-2.93	-8.822
Kounkel & Covey	2019	71.866	47.072	1.432	–	–	-6.373

💡 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–	0.68	0.78	0.74	213	-0.130	–	–	–
Yang et al.	2025	–	–	–	214	-0.130⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.144⁽¹⁾	–	–	–
Cavallo et al.	2024	0.68	0.82	–	407	0.530	–	–	–
Hunt & Reffert	2023	0.62	0.78	0.74	212	–	–	–	–
Kounkel & Covey	2019	0.70	0.72	–	211	–	–	–	–

(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 449	64.3	74.64	45.8	1.49	-1.29	-2.97	-7.8	0.04

💡 Note: The % column shows the percentage of members that Theia 560 shares with each listed object.

Visualization

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