Theia 274

0.06 UTI

0.63

C_N

0.13

C_dens

1.0

C_C3

0.1

C_lit

0.16

C_dup

N_m (P>50%) 76

Core radius and density 3.2 [pc], 0.6 [pc^-2]

C3 classification AA

C_N 0.63 Moderately populated
C_dens 0.13 Very loose
C_C3 1.0 Very high quality
C_lit 0.1 Rarely studied
C_dup 0.16 Likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 274 is a moderately populated, very loose object of very high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is rarely studied in the literature.

⚠️ Warning: This is likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.

Close Low extinction Near-solar metallicity Intermediate age

Yan et al. (2026)
Number of WDs: expected from single-star evolution N=8, with probability of formation through binary evolution >=0.5 N=0.

Palma et al. (2025)
Part of multiple system G137, along with Theia_773, Theia_986, HSC_2082, HSC_2085 and Theia_2103.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for Theia 274 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–	128.46	-39.577	1.317	-8.108	5.645	28.014
Yan et al.	2026	128.578	-39.522	1.301	-8.056	5.687	–
Hunt & Reffert	2024	128.578	-39.522	1.301	-8.056	5.687	26.714
Cavallo et al.	2024	128.325	-39.818	1.302	–	–	–
Hunt & Reffert	2023	128.578	-39.522	1.301	-8.056	5.687	26.714
Kounkel & Covey	2019	128.534	-39.727	1.285	–	–	15.043

💡 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–	0.74	0.27	1.1	125	0.160	481	–	–
Yan et al.	2026	–	–	–	141	–	–	–	–
Hunt & Reffert	2024	0.73	0.21	1.10	125	–	481⁽¹⁾	–	–
Cavallo et al.	2024	0.75	0.41	–	115	0.160	–	–	–
Hunt & Reffert	2023	0.73	0.21	1.10	125	–	–	–	–
Kounkel & Covey	2019	0.78	0.33	–	97	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Alessi Teutsch 7	84.2	128.23	-39.41	1.33	-8.11	5.64	28.72	0.53

💡 Note: The % column shows the percentage of members that Theia 274 shares with each listed object.

Visualization

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