Theia 619

0.29 UTI

0.42

C_N

0.09

C_dens

0.75

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 42

Core radius and density 3.2 [pc], 0.5 [pc^-2]

C3 classification AB

C_N 0.42 Poorly populated
C_dens 0.09 Very loose
C_C3 0.75 High quality
C_lit 0.1 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 619 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is rarely studied in the literature.

Very close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 342 along with Teutsch_181.

Palma et al. (2025)
Classified as optical pair P566, along with Teutsch_181.

Cavallo et al. (2024)
Gold sample.

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

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

Data

🔍 Search references for Theia 619 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–	330.616	53.863	1.966	5.756	2.028	-17.028
Cavallo et al.	2024	331.446	54.114	1.95	–	–	–
Hunt & Reffert	2023	330.345	53.799	1.968	5.89	2.029	-21.307
He et al.	2022	328.206	52.239	2.252	3.906	-1.916	–
Kounkel & Covey	2019	332.29	54.047	2.323	–	–	-7.35

💡 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–	0.495	0.39	0.58	74	0.110	–	–	–
Liu et al.	2025	0.65	0.23	–	74	–	–	–	–
Cavallo et al.	2024	0.51	0.94	–	69	0.110	–	–	–
Hunt & Reffert	2023	0.48	0.53	0.58	82	–	–	–	–
He et al.	2022	–	0.20	–	18	–	–	–	–
Kounkel & Covey	2019	0.43	0.39	–	280	–	–	–	–

Visualization

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