Theia 4930

0.21 UTI

0.29

C_N

0.09

C_dens

0.62

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 29

Core radius and density 1.8 [pc], 0.5 [pc^-2]

C3 classification AC

C_N 0.29 Poorly populated
C_dens 0.09 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 4930 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a low-mass, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the absorption and age parameters (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.

Close Low extinction Low mass Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P547, along with NGC_2546.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.92 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.92 (50th percentile).

Data

🔍 Search references for Theia 4930 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–	124.372	-36.733	1.071	-6.08	4.881	32.682
Hunt & Reffert	2024	124.383	-36.676	1.067	-6.102	4.893	35.423
Cavallo et al.	2024	124.403	-36.739	1.074	–	–	–
Hunt & Reffert	2023	124.383	-36.676	1.067	-6.102	4.893	35.423

💡 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–	0.9	0.21	0.83	250	-0.120	40	–	–
Hunt & Reffert	2024	0.90	0.21	0.83	250	–	40⁽¹⁾	–	–
Cavallo et al.	2024	0.94	1.04	–	62	-0.120	–	–	–
Hunt & Reffert	2023	0.90	0.21	0.83	250	–	–	–	–

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

Visualization

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