Theia 19

0.19 UTI

0.0

C_N

1.0

C_dens

0.75

C_C3

0.3

C_lit

0.4

C_dup

N₅₀ (P>50% members) 21

Stellar density (N₅₀/rad) 25.0 [N/pc²]

C3 classification AB

C_N 0.0 Sparse
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.3 Poorly studied
C_dup 0.4 Possibly duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 19 is a sparse, very dense object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is poorly studied in the literature.

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

Close Moderate extinction Near-solar metallicity Very young

Liu et al. (2025)
Classified as primordial binary cluster 304 along with OC_0227.

Palma et al. (2025)
Classified as genetic pair P240, along with OC_0227.

Cavallo et al. (2024)
Bronze sample.

Data

🔍 Search references for Theia 19 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–	3.213	65.576	1.395	2.397	-2.431	-12.653
Hunt & Reffert	2024	3.221	65.566	1.387	2.423	-2.396	-12.631
Cavallo et al.	2024	3.389	65.673	1.381	–	–	–
Hunt & Reffert	2023	3.221	65.566	1.387	2.423	-2.396	-12.631
He et al.	2022	3.116	65.692	1.398	2.466	-2.387	–

💡 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–	0.99	2.01	1.55	2	0.290	98	–	–
Liu et al.	2025	1.10	0.37	–	2	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	98⁽¹⁾	–	–
Cavallo et al.	2024	0.99	2.12	–	2	0.290	–	–	–
Hunt & Reffert	2023	0.69	3.01	1.55	4	–	–	–	–
He et al.	2022	–	1.90	–	2	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0223	60.0	3.2	65.56	1.39	2.38	-2.49	-12.38	0.4

💡 Note: The % column shows the percentage of members that Theia 19 shares with each listed object.

Visualization

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