Theia 1806

0.06 UTI

0.34

C_N

1.0

C_dens

0.12

C_C3

0.3

C_lit

0.15

C_dup

N₅₀ (P>50% members) 34

Stellar density (N₅₀/rad) 10.5 [N/pc²]

C3 classification DC

C_N 0.34 Poorly populated
C_dens 1.0 Very dense
C_C3 0.12 Very low quality
C_lit 0.3 Poorly studied
C_dup 0.15 Likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

Theia 1806 is a poorly populated, very dense object of very low C3 quality. Its parallax locates it at a relatively 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 absorption, age, and metallicity parameters (see Parameters). It was recently reported 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.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 43 along with COIN-Gaia_21.

Palma et al. (2025)
Classified as optical pair P3, along with COIN-Gaia_21.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 1806 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	85.449	27.492	0.758	-0.325	-4.367	-2.946
Hu & Soubiran	2025	85.409	27.458	–	–	–	–
Hunt & Reffert	2024	85.433	27.5	0.734	-0.208	-4.369	-3.067
Cavallo et al.	2024	85.409	27.458	0.737	–	–	–
Hunt & Reffert	2023	85.433	27.5	0.734	-0.208	-4.369	-3.067

💡 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–	1.5	1.51	2.39	513	0.080	176	–	–
Liu et al.	2025	1.73	0.36	–	794	–	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.200⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	176⁽¹⁾	–	–
Cavallo et al.	2024	1.50	1.51	–	513	0.360	–	–	–
Hunt & Reffert	2023	1.28	1.79	2.39	187	–	–	–	–

(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 127	85.3	85.44	27.48	0.76	-0.34	-4.36	7.82	0.3

💡 Note: The % column shows the percentage of members that Theia 1806 shares with each listed object.

Visualization

ℹ️

1 2