Theia 953

0.32 UTI

0.5

C_N

0.18

C_dens

0.75

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 50

Core radius and density 2.4 [pc], 0.9 [pc^-2]

C3 classification AB

C_N 0.5 Moderately populated
C_dens 0.18 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 953 is a moderately 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.

Close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as primordial binary cluster 54 along with CWNU_88.

Palma et al. (2025)
Part of multiple system G148, along with CWNU_88 and HSC_2271.

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.93 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.93 (50th percentile).

Data

🔍 Search references for Theia 953 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–	139.832	-58.601	1.855	-5.807	2.919	7.046
Swiggum et al.	2024	139.66	-58.605	1.793	-5.692	3.132	14.686
Cavallo et al.	2024	138.84	-58.192	1.801	–	–	–
Hunt & Reffert	2023	139.66	-58.605	1.793	-5.692	3.132	12.225
Kounkel & Covey	2019	139.022	-57.739	1.667	–	–	7.11

💡 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–	0.59	0.425	1.12	36	-0.040	291	–	–
Liu et al.	2025	0.60	0.10	–	23	–	–	–	–
Swiggum et al.	2024	0.55	–	–	36	–	291	–	–
Cavallo et al.	2024	0.59	0.64	–	7	-0.040	–	–	–
Hunt & Reffert	2023	0.54	0.53	1.12	36	–	–	–	–
Kounkel & Covey	2019	0.64	0.32	–	618	–	–	–	–

Visualization

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