Theia 4940

0.06 UTI

0.25

C_N

0.08

C_dens

0.5

C_C3

0.03

C_lit

0.32

C_dup

N_m (P>50%) 25

Core radius and density 2.1 [pc], 0.4 [pc^-2]

C3 classification BB

C_N 0.25 Poorly populated
C_dens 0.08 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.03 Rarely studied
C_dup 0.32 Possibly duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 4940 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It was recently reported in the literature.

⚠️ Warning: This is possibly a duplicate object, which shares a significant percentage of members with at least one previously reported entry. See table with shared members information.

Close Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P405, along with HSC_1027.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.96 (50th percentile), true positive? (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.96 (50th percentile), true positive? (human-assigned).

Data

🔍 Search references for Theia 4940 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–	30.075	68.613	0.993	0.744	0.589	-23.86
Hunt & Reffert	2024	29.339	68.667	0.984	0.751	0.598	-25.442
Cavallo et al.	2024	30.231	68.536	0.991	–	–	–
Hunt & Reffert	2023	29.339	68.667	0.984	0.751	0.598	-25.442

💡 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–	0.97	2.25	2.26	288	0.290	88	–	–
Hunt & Reffert	2024	0.97	2.25	2.26	288	–	88⁽¹⁾	–	–
Cavallo et al.	2024	1.12	2.58	–	87	0.290	–	–	–
Hunt & Reffert	2023	0.97	2.25	2.26	288	–	–	–	–

(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 377	68.0	29.99	68.64	0.99	0.65	0.62	-34.08	0.11
CWNU 103	52.0	30.68	68.44	0.98	0.75	0.57	-18.34	0.07

💡 Note: The % column shows the percentage of members that Theia 4940 shares with each listed object.

Visualization

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