Theia 648

0.09 UTI

0.0

C_N

0.08

C_dens

0.25

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 19

Core radius and density 1.8 [pc], 0.4 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.08 Very loose
C_C3 0.25 Low 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 648 is a sparse, very loose object of low 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, intermediate-age cluster (see Parameters). It is rarely studied 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 Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for Theia 648 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–	86.58	25.973	1.669	1.035	-3.212	-7.453
Zhang et al.	2024	86.578	25.965	–	–	–	–
Cavallo et al.	2024	86.306	26.191	1.724	–	–	–
Hunt & Reffert	2023	86.578	25.965	1.724	1.099	-3.153	-4.66
Kounkel & Covey	2019	86.85	26.229	1.598	–	–	-19.606

💡 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–	0.58	0.51	0.34	186	0.070	–	–	–
Zhang et al.	2024	–	–	–	–	0.000⁽¹⁾	–	–	–
Cavallo et al.	2024	0.58	0.43	–	186	0.140	–	–	–
Hunt & Reffert	2023	0.55	0.51	0.34	130	–	–	–	–
Kounkel & Covey	2019	0.63	0.64	–	301	–	–	–	–

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

Visualization

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