Theia 1001

0.31 UTI

0.75

C_N

1.0

C_dens

0.75

C_C3

0.25

C_lit

0.52

C_dup

N₅₀ (P>50% members) 103

Stellar density (N₅₀/rad) 28.0 [N/pc²]

C3 classification AB

C_N 0.75 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.25 Poorly studied
C_dup 0.52 Likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

Theia 1001 is a rich, very dense object of high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.

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

Close Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Part of multiple system G261, along with OC_0192 and CWNU_58.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 1001 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	343.75	59.247	1.093	2.186	0.031	-17.51
Zhang et al.	2024	343.75	59.243	–	–	–	–
Hunt & Reffert	2024	343.75	59.243	1.093	2.21	0.023	-19.092
Cavallo et al.	2024	343.767	59.255	1.096	–	–	–
Hunt & Reffert	2023	343.75	59.243	1.093	2.21	0.023	-19.092

💡 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–	0.925	2.255	1.78	170	0.085	258	–	–
Zhang et al.	2024	–	–	–	–	-0.300⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	258⁽¹⁾	–	–
Cavallo et al.	2024	0.97	2.17	–	234	0.470	–	–	–
Hunt & Reffert	2023	0.88	2.34	1.78	105	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 394	48.5	343.79	59.24	1.09	2.18	0.02	-14.22	0.57

💡 Note: The % column shows the percentage of members that Theia 1001 shares with each listed object.

Visualization

ℹ️

1 2