Theia 12

0.34 UTI

0.67

C_N

0.36

C_dens

0.75

C_C3

0.06

C_lit

0.89

C_dup

N_m (P>50%) 84

Core radius and density 2.1 [pc], 1.8 [pc^-2]

C3 classification AB

C_N 0.67 Moderately populated
C_dens 0.36 Loose
C_C3 0.75 High quality
C_lit 0.06 Rarely studied
C_dup 0.89 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Theia 12 is a moderately populated, loose object of high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, very young cluster (see Parameters). It is rarely studied in the literature.

Note: This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry. See table with shared members information.

Close High extinction Near-solar metallicity Very young

Palma et al. (2025)
Classified as optical pair (not dynamically associated) P168, along with UPK_38.

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Data

🔍 Search references for Theia 12 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–	281.947	-2.396	1.584	0.222	-6.238	6.148
Hunt & Reffert	2024	282.102	-2.382	1.569	0.139	-6.178	6.12
Cavallo et al.	2024	281.825	-2.246	1.571	–	–	–
Hunt & Reffert	2023	282.102	-2.382	1.569	0.139	-6.178	6.12
Kounkel & Covey	2019	281.702	-1.409	1.555	–	–	-2.502

💡 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–	0.625	3.19	2.91	6	0.080	262	–	–
Hunt & Reffert	2024	0.61	3.19	2.91	5	–	262⁽¹⁾	–	–
Cavallo et al.	2024	0.69	3.85	–	7	0.080	–	–	–
Hunt & Reffert	2023	0.61	3.19	2.91	5	–	–	–	–
Kounkel & Covey	2019	0.64	1.42	–	6	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 1245	58.3	282.06	-2.44	1.59	0.31	-6.31	5.34	0.06
Ryu 269	10.7	282.18	-2.46	1.6	0.31	-6.01	43.62	0.3

💡 Note: The % column shows the percentage of members that Theia 12 shares with each listed object.

Visualization

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