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

N₅₀ (P>50% members) 22

Stellar density (N₅₀/rad) 18.1 [N/pc²]

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 high extinction. It is catalogued as an old cluster (see Parameters). It was recently reported 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.

(*): The parallax distance estimate (~0.59 kpc) differs significantly from the median photometric distance (~0.45 kpc).

Very close High extinction Old

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

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

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	–

💡 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–	0.45	3.33	0.5	3733	–	–	–	–
Hunt & Reffert	2023	0.45	3.33	0.50	3733	–	–	–	–

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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