Theia 13

0.00 UTI

0.74

C_N

1.0

C_dens

1.0

C_C3

0.3

C_lit

0.0

C_dup

N₅₀ (P>50% members) 98

Stellar density (N₅₀/rad) 34.2 [N/pc²]

C3 classification AA

C_N 0.74 Moderately populated
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.3 Poorly studied
C_dup 0.0 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 13 is a moderately populated, very dense object of very high C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low 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 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.

Very close Low extinction Near-solar metallicity Very young

Liu et al. (2025)
Classified as primordial binary cluster 4 along with ASCC_18, and as primordial binary cluster 321 along with OCSN_65, and as primordial binary cluster 337 along with Sigma_Orionis, and of multiple system 3 along with ASCC_18, Sigma_Orionis, OCSN_65 and CWNU_1054.

Palma et al. (2025)
Part of multiple system G229, along with OCSN_56, OCSN_65, CWNU_1072, Sigma_Orionis, CWNU_1088, ASCC_18 and OCSN_68.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 13 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–	83.138	-1.758	2.404	0.076	-0.219	25.773
Liu et al.	2025	83.13	-1.75	2.41	0.1	-0.22	25.83
Zhang et al.	2024	83.132	-1.753	–	–	–	–
Hunt & Reffert	2024	83.132	-1.753	2.41	0.104	-0.222	25.828
Cavallo et al.	2024	83.197	-1.691	2.409	–	–	–
Hunt & Reffert	2023	83.132	-1.753	2.41	0.104	-0.222	25.828

💡 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–	0.41	0.3	0.98	6	-0.057	201	–	–
Liu et al.	2025	0.43	0.09	–	13	–	–	–	–
Zhang et al.	2024	–	–	–	–	-0.003⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	201⁽¹⁾	–	–
Cavallo et al.	2024	0.41	0.85	–	5	-0.110	–	–	–
Hunt & Reffert	2023	0.40	0.30	0.98	6	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Gulliver 6	100.0	83.34	-1.63	2.41	-0.07	-0.24	28.06	0.69
OCSN 194	100.0	83.32	-1.64	2.42	-0.06	-0.25	28.06	0.02
UBC 17 b	100.0	83.17	-1.71	2.4	0.07	-0.22	25.62	0.72

💡 Note: The % column shows the percentage of members that Theia 13 shares with each listed object.

Visualization

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