UBC 538

0.69 UTI

0.77

C_N

1.0

C_dens

1.0

C_C3

0.35

C_lit

1.0

C_dup

N₅₀ (P>50% members) 161

Stellar density (N₅₀/rad) 14.8 [N/pc²]

C3 classification AA

C_N 0.77 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.35 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 538 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a massive, 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.

Relatively close High extinction Massive Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 538 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–	242.6	-52.335	0.336	-2.923	-4.281	-25.401
Hu & Soubiran	2025	242.604	-52.336	–	–	–	–
Hunt & Reffert	2024	242.593	-52.335	0.337	-2.934	-4.282	-26.722
Cavallo et al.	2024	242.604	-52.336	0.338	–	–	–
Hunt & Reffert	2023	242.593	-52.335	0.337	-2.934	-4.282	-26.722
Cantat-Gaudin et al.	2020	242.592	-52.339	0.322	-2.895	-4.245	–
Castro-Ginard et al.	2020	242.593	-52.337	0.318	-2.877	-4.252	–

💡 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–	2.66	3.08	2.49	537	0.150	2334	–	–
Hu & Soubiran	2025	–	–	–	–	-0.480⁽⁵⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	2334⁽¹⁾	–	–
Cavallo et al.	2024	2.29	3.08	–	537	0.780	–	–	–
Hunt & Reffert	2023	2.66	3.83	2.49	93	–	–	–	–
Cantat-Gaudin et al.	2020	2.77	2.67	–	631	–	–	–	–

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

Visualization

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