Theia 7778

0.19 UTI

0.0

C_N

0.06

C_dens

0.75

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 18

Core radius and density 3.9 [pc], 0.3 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.06 Very loose
C_C3 0.75 High quality
C_lit 0.06 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 7778 is a sparse, very loose object of high C3 quality. Its parallax locates it at a moderate distance, below 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 metallicity parameter (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 Low mass Near-solar metallicity Intermediate age

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 7778 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–	311.726	35.708	0.444	-2.904	-4.218	–
Zhang et al.	2024	311.802	35.635	–	–	–	–
Hunt & Reffert	2024	311.802	35.635	0.43	-2.859	-4.224	–
Cavallo et al.	2024	311.723	35.757	0.431	–	–	–
Hunt & Reffert	2023	311.802	35.635	0.43	-2.859	-4.224	–

💡 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–	2.1	0.81	0.65	219	-0.055	44	–	–
Zhang et al.	2024	–	–	–	–	-0.310⁽¹⁾	–	–	–
Hunt & Reffert	2024	2.10	0.81	0.65	219	–	44⁽¹⁾	–	–
Cavallo et al.	2024	2.29	0.93	–	123	0.200	–	–	–
Hunt & Reffert	2023	2.10	0.81	0.65	219	–	–	–	–

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

Visualization

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