UBC 391

0.58 UTI

0.26

C_N

0.75

C_dens

1.0

C_C3

0.45

C_lit

1.0

C_dup

N₅₀ (P>50% members) 26

Stellar density (N₅₀/rad) 3.7 [N/pc²]

C3 classification AA

C_N 0.26 Poorly populated
C_dens 0.75 Dense
C_C3 1.0 Very high quality
C_lit 0.45 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 391 is a poorly populated, dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is poorly studied in the literature.

Relatively close Moderate extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P603, along with UBC_389.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for UBC 391 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–	338.947	59.057	0.397	-2.807	-2.009	–
Li et al.	2025	338.939	59.051	0.393	-2.859	-2.004	–
Almeida et al.	2025	338.894	59.007	–	–	–	–
Hunt & Reffert	2024	338.956	59.054	0.407	-2.786	-2.005	–
Cavallo et al.	2024	338.927	59.045	0.405	–	–	–
Hunt & Reffert	2023	338.956	59.054	0.407	-2.786	-2.005	–
Dias et al.	2021	338.894	59.007	0.369	-2.827	-1.984	-72.75
Cantat-Gaudin et al.	2020	338.939	59.051	0.393	-2.859	-2.004	–
Castro-Ginard et al.	2020	338.841	59.043	0.397	-2.84	-2.004	–

💡 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–	2.335	2.78	1.19	55	0.156	273	–	–
Li et al.	2025	2.34	2.81	–	529	-0.041	–	–	–
Almeida et al.	2025	2.39	2.75	–	12	–	339	–	–
Hunt & Reffert	2024	–	–	–	–	–	207⁽¹⁾	–	–
Cavallo et al.	2024	2.11	2.91	–	100	0.530	–	–	–
Hunt & Reffert	2023	2.33	3.03	1.19	60	–	–	–	–
Dias et al.	2021	2.39	2.75	–	12	0.156	–	–	–
Cantat-Gaudin et al.	2020	2.32	2.38	–	50	–	–	–	–

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

Visualization

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