Theia 365

0.10 UTI

0.0

C_N

0.06

C_dens

0.38

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 20

Core radius and density 2.7 [pc], 0.3 [pc^-2]

C3 classification BC

C_N 0.0 Sparse
C_dens 0.06 Very loose
C_C3 0.38 Low quality
C_lit 0.03 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 365 is a sparse, very loose object of 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 (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 Intermediate age

Palma et al. (2025)
Part of multiple system G246, along with Loden_1194 and Theia_447.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.96 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.96 (50th percentile).

Data

🔍 Search references for Theia 365 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–	217.236	-60.964	1.348	-6.899	-3.403	-15.436
Cavallo et al.	2024	217.108	-60.846	1.356	–	–	–
Hunt & Reffert	2023	216.706	-61.066	1.351	-6.927	-3.403	-16.612
Kounkel & Covey	2019	216.099	-61.328	1.091	–	–	-43.916

💡 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–	0.82	0.9	0.53	113	0.380	–	–	–
Cavallo et al.	2024	0.82	0.90	–	44	0.380	–	–	–
Hunt & Reffert	2023	0.72	0.41	0.53	113	–	–	–	–
Kounkel & Covey	2019	0.92	1.16	–	115	–	–	–	–

Visualization

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