Theia 15

0.44 UTI

0.0

C_N

1.0

C_dens

1.0

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 0.4 [pc], 15 [pc^-2]

C3 classification AA

C_N 0.0 Sparse
C_dens 1.0 Very dense
C_C3 1.0 Very 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 15 is a sparse, very dense object of very high C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is rarely studied in the literature.

Note: This object shares a large percentage of members with 3 later reported entries. See table with shared members information.

Close Moderate extinction Near-solar metallicity Very young

Palma et al. (2025)
Part of multiple system G88, along with FSR_1117 and FSR_1115.

Cavallo et al. (2024)
Bronze sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.14 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.14 (50th percentile).

Data

🔍 Search references for Theia 15 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–	90.868	-9.746	1.177	-2.237	1.619	46.287
Hunt & Reffert	2024	90.882	-9.742	1.187	-2.145	1.551	37.499
Cavallo et al.	2024	90.895	-9.784	1.181	–	–	–
Hunt & Reffert	2023	90.882	-9.742	1.187	-2.145	1.551	37.499
He et al.	2022	90.779	-9.798	1.205	-1.954	1.718	–
Kounkel & Covey	2019	90.644	-9.769	1.199	–	–	–

💡 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–	0.815	1.35	1.54	6	-0.110	62	–	–
Hunt & Reffert	2024	0.80	1.35	1.54	6	–	62⁽¹⁾	–	–
Cavallo et al.	2024	1.24	1.75	–	8	-0.110	–	–	–
Hunt & Reffert	2023	0.80	1.35	1.54	6	–	–	–	–
He et al.	2022	–	0.05	–	3	–	–	–	–
Kounkel & Covey	2019	0.83	2.10	–	7	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0362	96.0	90.89	-9.79	1.19	-2.11	1.64	39.52	0.32
CWWDL 14261	64.0	90.89	-9.75	1.16	-2.05	1.62	44.56	0.01
OC 0361	52.0	90.56	-9.92	1.23	-2.02	1.77	18.13	0.26

💡 Note: The % column shows the percentage of members that Theia 15 shares with each listed object.

Visualization

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