Theia 1224

0.09 UTI

0.0

C_N

0.08

C_dens

0.25

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 23

Core radius and density 2.2 [pc], 0.4 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.08 Very loose
C_C3 0.25 Low 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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Theia 1224 is a sparse, very loose object of low C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old 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.

Close Low extinction Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.08 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.08 (50th percentile).

Data

🔍 Search references for Theia 1224 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–	219.189	-55.18	1.816	-13.302	-7.746	-37.563
Hu & Soubiran	2025	219.481	-54.965	–	–	–	–
Cavallo et al.	2024	219.481	-54.965	1.838	–	–	–
Hunt & Reffert	2023	219.545	-55.165	1.849	-13.184	-7.748	-32.857
Kounkel & Covey	2019	219.155	-54.845	1.939	–	–	-24.289

💡 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–	0.52	0.78	0.9	1000	-0.190	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.210⁽⁵⁾	–	–	–
Cavallo et al.	2024	0.53	0.78	–	1000	-0.170	–	–	–
Hunt & Reffert	2023	0.52	0.84	0.90	353	–	–	–	–
Kounkel & Covey	2019	0.52	0.56	–	1029	–	–	–	–

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

Visualization

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