Theia 3402

0.22 UTI

0.28

C_N

0.23

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 28

Core radius and density 1.4 [pc], 1.2 [pc^-2]

C3 classification BB

C_N 0.28 Poorly populated
C_dens 0.23 Very loose
C_C3 0.5 Intermediate 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 3402 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a metal-rich, intermediate-age cluster (see Parameters). It was recently reported 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.

Distant Moderate extinction Metal-rich Intermediate age

Palma et al. (2025)
Classified as optical pair P578, along with UBC_1227.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.91 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.91 (50th percentile).

Data

🔍 Search references for Theia 3402 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–	30.731	63.001	0.283	-0.653	-0.443	-99.689
Hunt & Reffert	2024	30.746	62.996	0.282	-0.647	-0.435	–
Cavallo et al.	2024	30.704	63.073	0.285	–	–	–
Hunt & Reffert	2023	30.746	62.996	0.282	-0.647	-0.435	–

💡 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–	3.1	1.78	0.79	118	0.600	174	–	–
Hunt & Reffert	2024	3.10	1.78	0.79	118	–	174⁽¹⁾	–	–
Cavallo et al.	2024	4.39	1.98	–	71	0.600	–	–	–
Hunt & Reffert	2023	3.10	1.78	0.79	118	–	–	–	–

(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 2983	71.4	30.74	63.0	0.28	-0.67	-0.45	-59.3	0.03

💡 Note: The % column shows the percentage of members that Theia 3402 shares with each listed object.

Visualization

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