Theia 117

0.00 UTI

0.49

C_N

0.69

C_dens

1.0

C_C3

0.08

C_lit

0.0

C_dup

N₅₀ (P>50% members) 49

Stellar density (N₅₀/rad) 3.5 [N/pc²]

C3 classification AA

C_N 0.49 Poorly populated
C_dens 0.69 Moderately dense
C_C3 1.0 Very high quality
C_lit 0.08 Rarely 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 117 is a poorly populated, moderately dense object of very high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is rarely studied 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 Young

Liu et al. (2025)
Classified as primordial binary cluster 1 along with ADS_16795, and as primordial binary cluster 134 along with Delta_Cephei_Cluster, and of multiple system 4 along with ADS_16795 and Delta_Cephei_Cluster.

Palma et al. (2025)
Part of multiple system G69, along with ADS_16795 and Delta_Cephei_Cluster.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for Theia 117 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–	340.808	53.942	4.322	12.328	-1.627	-4.293
Liu et al.	2025	341.12	53.92	4.32	12.28	-1.53	-8.62
Cavallo et al.	2024	340.524	54.165	4.312	–	–	–
Hunt & Reffert	2023	341.115	53.925	4.32	12.282	-1.528	-8.619
Kounkel & Covey	2019	340.434	53.97	4.187	–	–	4.259

💡 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–	0.24	0.3	0.45	55	0.260	–	–	–
Liu et al.	2025	0.27	0.12	–	55	–	–	–	–
Cavallo et al.	2024	0.24	0.72	–	55	0.260	–	–	–
Hunt & Reffert	2023	0.23	0.18	0.45	89	–	–	–	–
Kounkel & Covey	2019	0.24	0.42	–	43	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
ASCC 123	100.0	340.06	54.11	4.3	12.25	-1.48	-4.99	0.83

💡 Note: The % column shows the percentage of members that Theia 117 shares with each listed object.

Visualization

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