Theia 4981

0.00 UTI

0.36

C_N

0.24

C_dens

0.62

C_C3

0.1

C_lit

0.0

C_dup

N_m (P>50%) 36

Core radius and density 1.9 [pc], 1.2 [pc^-2]

C3 classification AC

C_N 0.36 Poorly populated
C_dens 0.24 Very loose
C_C3 0.62 Intermediate quality
C_lit 0.1 Rarely studied
C_dup 0.0 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 4981 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It was recently reported in the literature.

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

Relatively close Low extinction Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 369 along with Theia_4284.

Palma et al. (2025)
Classified as optical pair P582, along with Theia_4284.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for Theia 4981 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–	128.307	-47.495	0.734	-7.826	7.872	25.632
Hu & Soubiran	2025	128.369	-47.486	–	–	–	–
Hunt & Reffert	2024	128.32	-47.529	0.725	-7.807	7.904	38.687
Cavallo et al.	2024	128.369	-47.487	0.729	–	–	–
Hunt & Reffert	2023	128.32	-47.529	0.725	-7.807	7.904	38.687

💡 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–	1.31	0.58	0.885	408	-0.045	128	–	–
Liu et al.	2025	1.60	0.19	–	468	–	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.140⁽⁵⁾	–	–	–
Hunt & Reffert	2024	1.31	0.60	0.88	348	–	128⁽¹⁾	–	–
Cavallo et al.	2024	1.28	0.56	–	724	0.050	–	–	–
Hunt & Reffert	2023	1.31	0.60	0.89	348	–	–	–	–

(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 59	100.0	128.31	-47.48	0.73	-7.83	7.87	29.01	0.27

💡 Note: The % column shows the percentage of members that Theia 4981 shares with each listed object.

Visualization

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