Theia 7

0.42 UTI

0.64

C_N

0.27

C_dens

1.0

C_C3

0.1

C_lit

1.0

C_dup

N_m (P>50%) 78

Core radius and density 2.1 [pc], 1.4 [pc^-2]

C3 classification AA

C_N 0.64 Moderately populated
C_dens 0.27 Loose
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 7 is a moderately populated, loose object of very high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is rarely studied in the literature.

Note: This object shares a significant percentage of members with 2 later reported entries. See table with shared members information.

Very close High extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Part of multiple system G111, along with HSC_1195, HSC_1318, Melotte_22 and HSC_1340.

Cavallo et al. (2024)
Wood sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.34 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.34 (50th percentile).

Data

🔍 Search references for Theia 7 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–	68.628	24.719	7.676	6.71	-21.199	13.002
Yang et al.	2025	68.304	24.39	–	–	–	–
Zhang et al.	2024	68.304	24.39	–	–	–	–
Cavallo et al.	2024	68.497	24.686	7.696	–	–	–
Hunt & Reffert	2023	68.304	24.39	7.674	6.85	-21.316	14.217
Kounkel & Covey	2019	67.077	25.97	7.362	–	–	5.389

💡 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–	0.14	3.44	2.1	109	-0.288	–	–	–
Yang et al.	2025	–	–	–	186	-0.460⁽³⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.288⁽¹⁾	–	–	–
Cavallo et al.	2024	0.15	3.84	–	32	0.300	–	–	–
Hunt & Reffert	2023	0.13	3.44	2.10	187	–	–	–	–
Kounkel & Covey	2019	0.14	0.25	–	3	–	–	–	–

(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 52	60.3	68.73	24.35	7.74	7.0	-21.17	14.64	0.0
Taurus	3.8	65.78	27.29	7.72	8.8	-25.91	14.81	0.2

💡 Note: The % column shows the percentage of members that Theia 7 shares with each listed object.

Visualization

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