Theia 230

0.19 UTI

0.25

C_N

0.02

C_dens

0.5

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 25

Core radius and density 2.7 [pc], 0.09 [pc^-2]

C3 classification BB

C_N 0.25 Poorly populated
C_dens 0.02 Very loose
C_C3 0.5 Intermediate 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 230 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster (see Parameters). It is rarely studied 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.

Very close Moderate extinction Near-solar metallicity Very young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.06 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.06 (50th percentile).

Data

🔍 Search references for Theia 230 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–	64.937	12.015	3.103	4.56	-5.586	9.327
Yang et al.	2025	65.002	12.418	–	–	–	–
Zhang et al.	2024	65.002	12.418	–	–	–	–
Cavallo et al.	2024	65.29	11.919	3.089	–	–	–
Hunt & Reffert	2023	65.002	12.418	3.075	5.09	-5.642	8.974
Kounkel & Covey	2019	66.307	12.655	3.081	–	–	-4.499

💡 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–	0.32	1.09	1.88	17	0.052	–	–	–
Yang et al.	2025	–	–	–	17	-0.120⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	0.052⁽¹⁾	–	–	–
Cavallo et al.	2024	0.32	1.58	–	14	0.090	–	–	–
Hunt & Reffert	2023	0.32	0.95	1.88	17	–	–	–	–
Kounkel & Covey	2019	0.32	1.09	–	88	–	–	–	–

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

Visualization

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