Theia 1040

0.33 UTI

0.26

C_N

0.14

C_dens

0.75

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 26

Stellar density (N₅₀/rad) 0.7 [N/pc²]

C3 classification AB

C_N 0.26 Poorly populated
C_dens 0.14 Very loose
C_C3 0.75 High quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 1040 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low 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.

Close Low extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P258, along with Alessi_2.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for Theia 1040 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–	69.397	56.585	1.585	-1.811	-5.645	-16.09
Hu & Soubiran	2025	69.134	56.719	–	–	–	–
Zhang et al.	2024	69.443	56.514	–	–	–	–
Cavallo et al.	2024	69.134	56.719	1.584	–	–	–
Hunt & Reffert	2023	69.443	56.514	1.579	-1.794	-5.647	-15.001

💡 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–	0.6	0.655	0.51	652	-0.050	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.070⁽⁵⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.050⁽¹⁾	–	–	–
Cavallo et al.	2024	0.61	0.67	–	708	0.330	–	–	–
Hunt & Reffert	2023	0.59	0.64	0.51	596	–	–	–	–

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

Visualization

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