Theia 3227

0.02 UTI

0.49

C_N

1.0

C_dens

0.5

C_C3

0.25

C_lit

0.04

C_dup

N₅₀ (P>50% members) 49

Stellar density (N₅₀/rad) 8.0 [N/pc²]

C3 classification BB

C_N 0.49 Poorly populated
C_dens 1.0 Very dense
C_C3 0.5 Intermediate quality
C_lit 0.25 Poorly studied
C_dup 0.04 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 3227 is a poorly populated, very dense object of intermediate C3 quality. Its parallax locates it at a moderate distance, below 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 age and metallicity parameters (see Parameters). It was recently reported in the literature.

⚠️ Warning: This is very likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.

Distant Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P463, along with HSC_2339.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 3227 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–	156.331	-59.084	0.27	-5.746	3.884	7.174
Hu & Soubiran	2025	156.332	-59.081	–	–	–	–
Hunt & Reffert	2024	156.339	-59.08	0.261	-5.762	3.885	-5.967
Cavallo et al.	2024	156.332	-59.082	0.262	–	–	–
Hunt & Reffert	2023	156.339	-59.08	0.261	-5.762	3.885	-5.967

💡 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–	3.275	1.79	2.25	694	0.005	498	–	–
Hu & Soubiran	2025	–	–	–	–	-0.350⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	498⁽¹⁾	–	–
Cavallo et al.	2024	2.87	1.47	–	1096	0.360	–	–	–
Hunt & Reffert	2023	3.68	2.11	2.25	291	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 1478	95.9	156.33	-59.08	0.27	-5.75	3.89	-5.95	0.38

💡 Note: The % column shows the percentage of members that Theia 3227 shares with each listed object.

Visualization

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