UBC 556

0.73 UTI

0.75

C_N

1.0

C_dens

1.0

C_C3

0.45

C_lit

1.0

C_dup

N₅₀ (P>50% members) 106

Stellar density (N₅₀/rad) 39.0 [N/pc²]

C3 classification AA

C_N 0.75 Rich
C_dens 1.0 Very 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 556 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, near 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.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for UBC 556 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–	259.287	-41.526	0.547	0.088	-0.755	41.816
Hu & Soubiran	2025	259.285	-41.53	–	–	–	–
Almeida et al.	2025	259.278	-41.522	–	–	–	–
Hunt & Reffert	2024	259.289	-41.522	0.546	0.091	-0.777	28.471
Cavallo et al.	2024	259.285	-41.53	0.546	–	–	–
Hunt & Reffert	2023	259.289	-41.522	0.546	0.091	-0.777	28.471
Dias et al.	2021	259.278	-41.522	0.531	0.099	-0.728	–
Cantat-Gaudin et al.	2020	259.305	-41.523	0.546	0.107	-0.738	–
Castro-Ginard et al.	2020	259.282	-41.525	0.548	0.117	-0.75	–

💡 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–	1.67	2.51	2.13	186	0.050	658	–	–
Hu & Soubiran	2025	–	–	–	–	-0.200⁽⁵⁾	–	–	–
Almeida et al.	2025	1.67	2.51	–	186	–	486	–	–
Hunt & Reffert	2024	–	–	–	–	–	831⁽¹⁾	–	–
Cavallo et al.	2024	1.64	2.73	–	513	0.050	–	–	–
Hunt & Reffert	2023	1.67	2.86	2.13	144	–	–	–	–
Dias et al.	2021	1.67	2.51	–	186	0.375	–	–	–
Cantat-Gaudin et al.	2020	1.74	2.28	–	479	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
LISC 3180	97.2	259.29	-41.52	0.55	0.09	-0.76	1.78	0.05

💡 Note: The % column shows the percentage of members that UBC 556 shares with each listed object.

Visualization

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