UBC 523

0.53 UTI

0.55

C_N

0.57

C_dens

1.0

C_C3

0.26

C_lit

1.0

C_dup

N_m (P>50%) 59

Core radius and density 1.9 [pc], 2.9 [pc^-2]

C3 classification AA

C_N 0.55 Moderately populated
C_dens 0.57 Moderately dense
C_C3 1.0 Very high quality
C_lit 0.26 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 523 is a moderately populated, moderately dense object of very 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 poorly studied in the literature.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: good 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 523 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–	191.651	-66.207	0.312	-5.067	0.008	-5.106
Li et al.	2025	191.63	-66.205	0.311	-5.078	0.033	–
Hu & Soubiran	2025	191.644	-66.203	–	–	–	–
Almeida et al.	2025	191.664	-66.2	–	–	–	–
Hunt & Reffert	2024	191.643	-66.209	0.294	-5.074	0.009	-34.929
Cavallo et al.	2024	191.644	-66.203	0.297	–	–	–
Hunt & Reffert	2023	191.643	-66.209	0.294	-5.074	0.009	-34.929
Dias et al.	2021	191.664	-66.2	0.292	-5.051	0.03	–
Cantat-Gaudin et al.	2020	191.63	-66.205	0.311	-5.078	0.033	–
Castro-Ginard et al.	2020	191.647	-66.205	0.31	-5.068	0.046	–

💡 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–	2.94	1.84	1.83	233	-0.096	460	–	–
Li et al.	2025	2.82	1.84	–	397	-0.042	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.160⁽⁵⁾	–	–	–
Almeida et al.	2025	3.13	2.01	–	104	–	333	–	–
Hunt & Reffert	2024	2.94	1.84	1.83	300	–	586⁽¹⁾	–	–
Cavallo et al.	2024	2.11	1.56	–	891	-0.150	–	–	–
Hunt & Reffert	2023	2.94	1.84	1.83	300	–	–	–	–
Dias et al.	2021	3.13	2.01	–	104	0.121	–	–	–
Cantat-Gaudin et al.	2020	3.34	1.56	–	166	–	–	–	–
Kounkel et al.	2020	2.67	1.97	–	100	–	–	–	–

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

Visualization

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