UBC 528

0.40 UTI

0.52

C_N

0.13

C_dens

0.75

C_C3

0.29

C_lit

1.0

C_dup

N_m (P>50%) 54

Core radius and density 2.9 [pc], 0.7 [pc^-2]

C3 classification BA

C_N 0.52 Moderately populated
C_dens 0.13 Very loose
C_C3 0.75 High quality
C_lit 0.29 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 528 is a moderately populated, very loose object of high C3 quality. Its parallax locates it at a moderate distance, above 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 and metallicity parameters (see Parameters). It is poorly studied in the literature.

Distant Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.91 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.91 (50th percentile).

Data

🔍 Search references for UBC 528 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–	204.634	-61.605	0.287	-4.853	-1.786	-31.543
Li et al.	2025	204.627	-61.607	0.252	-4.819	-1.793	–
Hu & Soubiran	2025	204.612	-61.609	–	–	–	–
Almeida et al.	2025	204.627	-61.603	–	–	–	–
Hunt & Reffert	2024	204.629	-61.621	0.297	-4.864	-1.784	-28.235
Cavallo et al.	2024	204.612	-61.609	0.296	–	–	–
Hunt & Reffert	2023	204.629	-61.621	0.297	-4.864	-1.784	-28.235
Jadhav & Subramaniam	2021	204.627	-61.607	–	–	–	–
Dias et al.	2021	204.627	-61.603	0.267	-4.823	-1.796	-36.381
Cantat-Gaudin et al.	2020	204.627	-61.607	0.252	-4.819	-1.793	–
Castro-Ginard et al.	2020	204.64	-61.606	0.256	-4.821	-1.806	–

💡 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–	3.47	2.63	1.41	466	-0.003	513	–	0
Li et al.	2025	2.55	2.47	–	1078	-0.025	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.410⁽⁵⁾	–	–	–
Almeida et al.	2025	3.47	2.69	–	466	–	748	–	–
Hunt & Reffert	2024	3.18	2.63	1.41	288	–	513⁽¹⁾	–	–
Cavallo et al.	2024	2.30	2.11	–	1023	0.020	–	–	–
Hunt & Reffert	2023	3.18	2.63	1.41	288	–	–	–	–
Jadhav & Subramaniam	2021	3.80	0.83	–	2692	–	502	–	0⁽¹⁾
Dias et al.	2021	3.47	2.69	–	466	0.137	–	–	–
Cantat-Gaudin et al.	2020	3.80	0.83	–	2692	–	–	–	–
Kounkel et al.	2020	3.48	3.10	–	186	–	–	–	–

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

Visualization

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