Theia 167

0.11 UTI

0.0

C_N

0.05

C_dens

0.38

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 2.0 [pc], 0.2 [pc^-2]

C3 classification BC

C_N 0.0 Sparse
C_dens 0.05 Very loose
C_C3 0.38 Low quality
C_lit 0.06 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 167 is a sparse, very loose object of low 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: 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.

Very close Low extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P525, along with HSC_751.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for Theia 167 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–	331.486	49.167	2.89	4.476	0.253	-7.156
Swiggum et al.	2024	332.022	49.192	2.932	4.813	0.261	-5.495
Cavallo et al.	2024	334.59	49.822	2.928	–	–	–
Hunt & Reffert	2023	332.022	49.192	2.932	4.813	0.261	-3.016
Kounkel & Covey	2019	334.168	50.588	2.355	–	–	0.721

💡 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–	0.345	0.28	0.37	51	0.150	54	–	–
Swiggum et al.	2024	0.34	–	–	51	–	54	–	–
Cavallo et al.	2024	0.35	0.48	–	45	0.150	–	–	–
Hunt & Reffert	2023	0.33	0.07	0.37	51	–	–	–	–
Kounkel & Covey	2019	0.42	0.28	–	78	–	–	–	–

Visualization

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