Theia 38

0.00 UTI

0.25

C_N

1.0

C_dens

0.75

C_C3

0.25

C_lit

0.0

C_dup

N₅₀ (P>50% members) 25

Stellar density (N₅₀/rad) 25.3 [N/pc²]

C3 classification AB

C_N 0.25 Poorly populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.25 Poorly studied
C_dup 0.0 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

Theia 38 is a poorly populated, very dense object of high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young 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.

Close Moderate extinction Near-solar metallicity Very young

Palma et al. (2025)
Classified as optical pair P580, along with Theia_738.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Theia 38 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	291.815	21.143	2.02	1.228	-6.402	19.114
Zhang et al.	2024	291.745	21.117	–	–	–	–
Hunt & Reffert	2024	291.745	21.117	1.981	1.181	-6.101	-11.229
Cavallo et al.	2024	290.753	22.222	1.979	–	–	–
Hunt & Reffert	2023	291.745	21.117	1.981	1.181	-6.101	-11.229

💡 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–	0.51	1.15	2.05	5	-0.085	430	–	–
Zhang et al.	2024	–	–	–	–	0.030⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	430⁽¹⁾	–	–
Cavallo et al.	2024	0.53	1.53	–	4	-0.200	–	–	–
Hunt & Reffert	2023	0.49	0.77	2.05	6	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OCSN 13	100.0	291.75	21.11	2.0	1.55	-6.64	-10.02	0.33
OC 0083	40.0	291.76	21.1	1.99	1.58	-6.74	-8.47	0.54

💡 Note: The % column shows the percentage of members that Theia 38 shares with each listed object.

Visualization

ℹ️

1 2