Theia 3457

0.15 UTI

0.0

C_N

0.05

C_dens

0.62

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 3.6 [pc], 0.3 [pc^-2]

C3 classification AC

C_N 0.0 Sparse
C_dens 0.05 Very loose
C_C3 0.62 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 3457 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, near 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: 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.

Relatively close Low extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P331, along with CWNU_1818.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Data

🔍 Search references for Theia 3457 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–	316.325	47.205	0.577	0.25	-2.175	-17.204
Hunt & Reffert	2024	316.245	47.273	0.578	0.283	-2.209	-17.228
Cavallo et al.	2024	316.341	47.2	0.578	–	–	–
Hunt & Reffert	2023	316.245	47.273	0.578	0.283	-2.209	-17.228

💡 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–	1.65	0.99	2.09	71	0.100	226	–	–
Hunt & Reffert	2024	1.65	0.99	2.09	71	–	226⁽¹⁾	–	–
Cavallo et al.	2024	1.67	1.37	–	69	0.100	–	–	–
Hunt & Reffert	2023	1.65	0.99	2.09	71	–	–	–	–

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

Visualization

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