Theia 1188

0.28 UTI

0.28

C_N

0.28

C_dens

0.5

C_C3

0.16

C_lit

1.0

C_dup

N_m (P>50%) 28

Core radius and density 1.6 [pc], 1.4 [pc^-2]

C3 classification DA

C_N 0.28 Poorly populated
C_dens 0.28 Loose
C_C3 0.5 Intermediate quality
C_lit 0.16 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 1188 is a poorly populated, loose object of intermediate C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is rarely studied in the literature.

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

Very close Low extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P517, along with HSC_683.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.94 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.94 (50th percentile).

Data

🔍 Search references for Theia 1188 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–	338.708	29.919	3.115	-7.865	-4.35	4.995
Hu & Soubiran	2025	338.195	29.939	–	–	–	–
Yang et al.	2025	338.742	29.991	–	–	–	–
Zhang et al.	2024	338.742	29.991	–	–	–	–
Cavallo et al.	2024	338.195	29.939	3.036	–	–	–
Hunt & Reffert	2023	338.742	29.991	3.027	-7.847	-4.536	4.219
He et al.	2022	338.673	29.937	3.116	-7.852	-4.356	–
Kounkel & Covey	2019	338.171	30.649	3.097	–	–	13.438

💡 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–	0.32	0.295	0.66	575	0.070	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.190⁽⁵⁾	–	–	–
Yang et al.	2025	–	–	–	575	0.000⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	0.141⁽¹⁾	–	–	–
Cavallo et al.	2024	0.33	0.36	–	575	0.410	–	–	–
Hunt & Reffert	2023	0.31	0.23	0.66	570	–	–	–	–
He et al.	2022	–	0.50	–	891	–	–	–	–
Kounkel & Covey	2019	0.32	0.13	–	1098	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OCSN 26	85.7	338.71	29.95	3.12	-7.91	-4.35	4.99	0.02

💡 Note: The % column shows the percentage of members that Theia 1188 shares with each listed object.

Visualization

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