Theia 46

0.21 UTI

0.0

C_N

0.24

C_dens

0.75

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 13

Core radius and density 1.6 [pc], 1.2 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.24 Very loose
C_C3 0.75 High 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 46 is a sparse, very loose object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by high extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is rarely studied in the literature.

Note: This object shares a very small percentage of members with a later reported entry. 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 High extinction Intermediate age

Palma et al. (2025)
Part of multiple system G260, along with HSC_889 and HSC_870.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.82 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.82 (50th percentile).

Data

🔍 Search references for Theia 46 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–	346.439	63.353	1.324	-1.252	-1.833	–
Hunt & Reffert	2024	346.662	63.387	1.412	-1.293	-1.753	–
Hunt & Reffert	2023	346.662	63.387	1.412	-1.293	-1.753	–
Kounkel & Covey	2019	346.654	62.889	1.83	–	–	-11.652

💡 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–	0.71	4.75	0.83	237	–	125	–	–
Hunt & Reffert	2024	0.71	4.75	0.83	237	–	125⁽¹⁾	–	–
Hunt & Reffert	2023	0.71	4.75	0.83	238	–	–	–	–
Kounkel & Covey	2019	0.55	1.66	–	20	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 178	8.0	346.17	63.36	1.16	-1.22	-1.84	-14.65	0.55

💡 Note: The % column shows the percentage of members that Theia 46 shares with each listed object.

Visualization

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