Theia 933

0.14 UTI

0.26

C_N

0.12

C_dens

0.25

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 26

Core radius and density 2.4 [pc], 0.6 [pc^-2]

C3 classification CC

C_N 0.26 Poorly populated
C_dens 0.12 Very loose
C_C3 0.25 Low 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 933 is a poorly populated, 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, intermediate-age 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 Intermediate age

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.93 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.93 (50th percentile).

Data

🔍 Search references for Theia 933 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–	72.454	43.847	3.458	11.064	-17.899	7.695
Yang et al.	2025	72.404	43.613	–	–	–	–
Hunt & Reffert	2023	72.404	43.613	3.469	11.098	-17.615	8.745
Kounkel & Covey	2019	72.125	43.433	2.247	–	–	-0.124

💡 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–	0.36	0.485	0.56	628	-0.020	–	–	–
Yang et al.	2025	–	–	–	631	-0.020⁽³⁾	–	–	–
Hunt & Reffert	2023	0.28	0.46	0.56	628	–	–	–	–
Kounkel & Covey	2019	0.44	0.51	–	584	–	–	–	–

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

Visualization

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