Theia 172

0.05 UTI

0.84

C_N

1.0

C_dens

1.0

C_C3

0.25

C_lit

0.07

C_dup

N₅₀ (P>50% members) 330

Stellar density (N₅₀/rad) 7.2 [N/pc²]

C3 classification AA

C_N 0.84 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.25 Poorly studied
C_dup 0.07 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 172 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (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 Young

Palma et al. (2025)
Part of multiple system G127, along with Theia_383 and HSC_1707.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 172 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–	110.209	3.703	2.125	-6.503	-5.118	13.557
Zhang et al.	2024	110.277	4.082	–	–	–	–
Hunt & Reffert	2024	110.277	4.082	2.113	-6.459	-5.036	15.359
Cavallo et al.	2024	110.091	3.188	2.12	–	–	–
Hunt & Reffert	2023	110.277	4.082	2.113	-6.459	-5.036	15.359

💡 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–	0.47	0.185	0.54	99	0.094	156	–	–
Zhang et al.	2024	–	–	–	–	-0.002⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	156⁽¹⁾	–	–
Cavallo et al.	2024	0.49	0.28	–	76	0.190	–	–	–
Hunt & Reffert	2023	0.45	0.09	0.54	122	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OCSN 104	92.7	110.2	3.61	2.13	-6.5	-5.1	13.56	0.48
CWWDL 14655	21.8	110.32	3.74	2.14	-6.53	-5.24	13.45	0.0
CWWDL 14656	15.2	109.7	3.37	2.13	-6.46	-5.05	15.02	0.0
CWNU 254	14.8	110.24	3.84	2.16	-6.51	-5.23	12.63	0.45

💡 Note: The % column shows the percentage of members that Theia 172 shares with each listed object.

Visualization

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