Theia 1315

0.31 UTI

0.32

C_N

0.26

C_dens

0.75

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 32

Core radius and density 1.1 [pc], 1.3 [pc^-2]

C3 classification AB

C_N 0.32 Poorly populated
C_dens 0.26 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 1315 is a poorly populated, loose object of high C3 quality. Its parallax locates it at a very 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.

Very close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 355 along with HSC_2387.

Palma et al. (2025)
Part of multiple system G153, along with HSC_2387, HSC_2398 and HSC_2297.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.97 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Data

🔍 Search references for Theia 1315 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–	146.962	-65.148	2.32	-12.309	6.565	11.57
Swiggum et al.	2024	146.876	-65.115	2.302	-12.219	6.414	12.235
Cavallo et al.	2024	147.271	-65.232	2.316	–	–	–
Hunt & Reffert	2023	146.876	-65.115	2.302	-12.219	6.414	12.037
Kounkel & Covey	2019	149.247	-66.729	1.516	–	–	4.15

💡 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–	0.46	0.345	0.72	42	0.360	98	–	–
Liu et al.	2025	0.69	0.27	–	32	–	–	–	–
Swiggum et al.	2024	0.43	–	–	42	–	98	–	–
Cavallo et al.	2024	0.46	0.36	–	30	0.360	–	–	–
Hunt & Reffert	2023	0.43	0.56	0.72	42	–	–	–	–
Kounkel & Covey	2019	0.65	0.33	–	1270	–	–	–	–

Visualization

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