Theia 47

0.22 UTI

0.46

C_N

0.06

C_dens

0.25

C_C3

0.16

C_lit

1.0

C_dup

N_m (P>50%) 46

Core radius and density 3.5 [pc], 0.3 [pc^-2]

C3 classification CC

C_N 0.46 Poorly populated
C_dens 0.06 Very loose
C_C3 0.25 Low quality
C_lit 0.16 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 47 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption, age, and metallicity parameters (see Parameters). It is rarely studied in the literature.

Note: This object shares a significant percentage of members with 2 later reported entries. See table with shared members information.

⚠️ 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 Moderate extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 187 along with HSC_1210, and of multiple system 31 along with CWNU_1086 and HSC_1210.

Palma et al. (2025)
Part of multiple system G106, along with CWNU_1086, UPK_325, HSC_1210, Theia_1083 and HSC_1205.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.92 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.92 (50th percentile).

Data

🔍 Search references for Theia 47 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–	64.207	51.455	1.285	0.442	-3.424	0.288
Liu et al.	2025	63.99	51.6	1.28	0.33	-3.48	3.02
Yang et al.	2025	63.989	51.598	–	–	–	–
Zhang et al.	2024	63.989	51.598	–	–	–	–
Cavallo et al.	2024	65.333	50.837	1.285	–	–	–
Hunt & Reffert	2023	63.989	51.598	1.283	0.329	-3.482	3.016
He et al.	2022	66.228	51.801	1.305	0.77	-3.86	–
Kounkel & Covey	2019	65.917	52.13	1.267	–	–	-1.338

💡 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–	0.77	1.29	1.74	68	-0.209	–	–	–
Liu et al.	2025	1.13	0.40	–	87	–	–	–	–
Yang et al.	2025	–	–	–	407	-0.170⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.209⁽¹⁾	–	–	–
Cavallo et al.	2024	0.74	2.53	–	32	-0.790	–	–	–
Hunt & Reffert	2023	0.75	1.29	1.74	406	–	–	–	–
He et al.	2022	–	2.20	–	50	–	–	–	–
Kounkel & Covey	2019	0.79	1.08	–	18	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 1125	54.3	64.52	51.16	1.28	0.44	-3.39	-1.3	0.02
HSC 1205	50.0	64.34	51.32	1.29	0.46	-3.32	-1.3	0.01

💡 Note: The % column shows the percentage of members that Theia 47 shares with each listed object.

Visualization

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