Theia 1829

0.01 UTI

0.25

C_N

0.44

C_dens

0.5

C_C3

0.03

C_lit

0.04

C_dup

N_m (P>50%) 25

Core radius and density 0.5 [pc], 2.2 [pc^-2]

C3 classification BB

C_N 0.25 Poorly populated
C_dens 0.44 Loose
C_C3 0.5 Intermediate quality
C_lit 0.03 Rarely 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 1829 is a poorly populated, loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a metal-poor, intermediate-age cluster (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.

Relatively close Moderate extinction Metal-poor Intermediate age

Palma et al. (2025)
Classified as optical pair P169, along with Theia_984.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for Theia 1829 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–	278.19	-13.003	0.947	0.623	-3.792	-16.499
Hunt & Reffert	2024	278.214	-13.019	0.945	0.618	-3.807	-8.878
Cavallo et al.	2024	278.207	-13.041	0.949	–	–	–
Hunt & Reffert	2023	278.214	-13.019	0.945	0.618	-3.807	-8.878

💡 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–	1.01	1.12	0.46	126	-0.550	119	–	–
Hunt & Reffert	2024	1.01	1.12	0.46	126	–	119⁽¹⁾	–	–
Cavallo et al.	2024	0.84	1.41	–	195	-0.550	–	–	–
Hunt & Reffert	2023	1.01	1.12	0.46	126	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 14361	96.0	278.18	-13.02	0.95	0.62	-3.8	-15.24	0.19

💡 Note: The % column shows the percentage of members that Theia 1829 shares with each listed object.

Visualization

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