Theia 323

0.18 UTI

0.25

C_N

0.09

C_dens

0.5

C_C3

0.03

C_lit

1.0

C_dup

N_m (P>50%) 25

Core radius and density 2.3 [pc], 0.5 [pc^-2]

C3 classification BB

C_N 0.25 Poorly populated
C_dens 0.09 Very loose
C_C3 0.5 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 323 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a very close distance, above 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.

Note: This object shares a moderate percentage of members with a later reported entry. See table with shared members information.

⚠️ 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.

Very 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 323 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–	194.176	-55.692	2.049	-13.69	-3.296	3.254
Cavallo et al.	2024	191.29	-55.715	2.017	–	–	–
Hunt & Reffert	2023	194.203	-55.763	2.011	-13.905	-3.07	-0.661
Kounkel & Covey	2019	195.033	-57.111	1.909	–	–	-5.275

💡 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–	0.48	0.5	0.98	100	0.030	–	–	–
Cavallo et al.	2024	0.48	0.69	–	95	0.030	–	–	–
Hunt & Reffert	2023	0.47	0.22	0.98	128	–	–	–	–
Kounkel & Covey	2019	0.52	0.50	–	100	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 450	48.0	194.43	-55.77	2.06	-13.54	-3.65	0.01	0.15

💡 Note: The % column shows the percentage of members that Theia 323 shares with each listed object.

Visualization

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