Theia 171

0.17 UTI

0.26

C_N

0.01

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 26

Core radius and density 2.3 [pc], 0.06 [pc^-2]

C3 classification BB

C_N 0.26 Poorly populated
C_dens 0.01 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.03 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 171 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low extinction. It is catalogued as a metal-rich, young cluster, but with a large variance across recent sources for the absorption parameter (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.

Close Low extinction Metal-rich Young

Palma et al. (2025)
Part of multiple system G36, along with Teutsch_35 and CWNU_1183.

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 171 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–	292.37	32.072	1.96	5.337	4.629	-16.843
Cavallo et al.	2024	292.404	31.621	1.912	–	–	–
Hunt & Reffert	2023	293.081	31.995	1.91	5.326	4.535	-22.095
Kounkel & Covey	2019	293.157	31.451	2.065	–	–	-0.984

💡 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–	0.5	0.14	0.89	79	0.730	–	–	–
Cavallo et al.	2024	0.56	0.00	–	68	0.730	–	–	–
Hunt & Reffert	2023	0.50	0.14	0.89	137	–	–	–	–
Kounkel & Covey	2019	0.48	0.20	–	79	–	–	–	–

Visualization

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