UPK 381

0.56 UTI

0.25

C_N

0.44

C_dens

0.62

C_C3

0.75

C_lit

1.0

C_dup

N₅₀ (P>50% members) 25

Stellar density (N₅₀/rad) 2.2 [N/pc²]

C3 classification CA

C_N 0.25 Poorly populated
C_dens 0.44 Loose
C_C3 0.62 Intermediate quality
C_lit 0.75 Well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UPK 381 is a poorly populated, loose object of intermediate 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 (see Parameters). It is well-studied in the literature.

Close Low extinction Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for UPK 381 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–	95.417	29.205	1.393	0.434	-2.953	4.718
Li et al.	2025	95.506	29.107	1.378	0.437	-2.987	–
Almeida et al.	2025	95.448	29.18	–	–	–	–
Alfonso et al.	2024	95.351	29.18	1.346	0.434	-2.947	–
Zhang et al.	2024	95.27	29.517	–	–	–	–
Cavallo et al.	2024	95.173	29.539	1.386	–	–	–
Hunt & Reffert	2023	95.27	29.517	1.382	0.384	-2.936	2.477
Almeida et al.	2023	95.438	29.135	–	–	–	–
He et al.	2022	95.248	29.528	1.4	0.423	-2.969	–
Tarricq et al.	2022	95.781	29.271	1.385	0.445	-2.958	–
Dias et al.	2021	95.448	29.18	1.346	0.437	-2.997	5.646
Cantat-Gaudin et al.	2020	95.506	29.107	1.378	0.437	-2.987	–
Cantat-Gaudin & Anders	2020	95.5	29.205	1.377	0.48	-2.986	–
Sim et al.	2019	95.506	29.163	–	0.48	-2.96	–

💡 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–	0.7	0.39	1.24	295	0.041	128	0.58	–
Li et al.	2025	0.66	0.39	–	318	-0.050	–	–	–
Almeida et al.	2025	0.70	0.39	–	366	–	112	–	–
Alfonso et al.	2024	0.71	0.23	–	380	0.100	–	–	–
Zhang et al.	2024	–	–	–	–	-0.148⁽¹⁾	–	–	–
Cavallo et al.	2024	0.70	0.62	–	234	0.080	–	–	–
Hunt & Reffert	2023	0.68	0.30	1.24	201	–	–	–	–
Almeida et al.	2023	0.69	0.31	–	402	0.002	143⁽¹⁾	0.58	–
He et al.	2022	–	0.70	–	200	–	–	–	–
Tarricq et al.	2022	0.70	–	–	295	–	–	–	–
Dias et al.	2021	0.70	0.39	–	366	0.100	–	–	–
Cantat-Gaudin et al.	2020	0.71	0.23	–	288	–	–	–	–
Cantat-Gaudin & Anders	2020	0.71	–	–	–	–	–	–	–
Sim et al.	2019	0.71	–	–	100	–	–	–	–

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

Visualization

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