Theia 738

0.00 UTI

0.0

C_N

1.0

C_dens

0.38

C_C3

0.0

C_lit

0.0

C_dup

N_m (P>50%) 22

Core radius and density 0.6 [pc], 6.7 [pc^-2]

C3 classification CB

C_N 0.0 Sparse
C_dens 1.0 Very dense
C_C3 0.38 Low quality
C_lit 0.0 Rarely studied
C_dup 0.0 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Theia 738 is a sparse, very dense object of low C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as an old cluster (see Parameters). It is rarely studied in the literature.

⚠️ Warning: This is very 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 Moderate extinction Old

Palma et al. (2025)
Classified as optical pair P580, along with Theia_38.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.97 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Data

🔍 Search references for Theia 738 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–	290.77	22.163	1.688	3.774	3.649	-20.657
Hunt & Reffert	2023	290.733	22.155	2.094	3.717	3.742	–
Kounkel & Covey	2019	290.829	22.08	1.708	–	–	-2.252

💡 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–	0.52	2.145	0.5	2056	–	–	–	–
Hunt & Reffert	2023	0.45	3.33	0.50	3733	–	–	–	–
Kounkel & Covey	2019	0.59	0.96	–	379	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
NGC 6793	100.0	290.81	22.15	1.67	3.8	3.54	-19.66	0.98

💡 Note: The % column shows the percentage of members that Theia 738 shares with each listed object.

Visualization

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