UBC 591

0.27 UTI

0.61

C_N

1.0

C_dens

0.75

C_C3

0.5

C_lit

0.4

C_dup

C3 classification AB

Number of members (P>50%) 72

Radius (P>50% members) 3.4 [arcmin]

C_N 0.61 Moderately populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.5 Moderately studied
C_dup 0.4 Possibly duplicate

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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UBC 591 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is moderately studied in the literature.

⚠️ Warning: This is possibly a duplicate object, which shares a significant percentage of members with at least one previously reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 591 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	–	325.016	49.307	0.432	-3.476	-4.915	–
Almeida et al.	2025	325.019	49.316	–	–	–	–
Zhang et al.	2024	325.01	49.313	–	–	–	–
Hunt & Reffert	2024	325.009	49.313	0.431	-3.475	-4.916	–
Cavallo et al.	2024	324.998	49.308	0.434	–	–	–
Hunt & Reffert	2023	325.009	49.313	0.431	-3.475	-4.916	–
Almeida et al.	2023	325.015	49.315	–	–	–	–
Dias et al.	2021	325.019	49.316	0.445	-3.479	-4.899	–
Cantat-Gaudin et al.	2020	325.003	49.324	0.49	-3.506	-4.848	–

💡 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]	Bfr	BSS
Almeida et al.	2025	2.01	1.38	–	70	–	155	–	–
Zhang et al.	2024	–	–	–	–	-0.084*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	359*	–	–
Cavallo et al.	2024	2.20	1.35	–	257	-0.200	–	–	–
Hunt & Reffert	2023	2.19	0.91	1.10	368	–	–	–	–
Almeida et al.	2023	2.07	1.21	–	122	0.025	204*	0.51	–
Dias et al.	2021	2.01	1.38	–	70	-0.078	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 569	72.2	325.0	49.31	0.43	-3.48	-4.91	–	0.0
UBC 382	59.7	325.01	49.31	0.43	-3.47	-4.91	–	0.64

💡 Note: The % column shows the percentage of members that UBC 591 shares with each listed object.

Visualization

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