UBC 558

0.70 UTI

0.79

C_N

1.0

C_dens

1.0

C_C3

0.35

C_lit

1.0

C_dup

N₅₀ (P>50% members) 212

Stellar density (N₅₀/rad) 27.1 [N/pc²]

C3 classification AA

C_N 0.79 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 558 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by high extinction. It is catalogued as a massive, near-solar metallicity, young cluster (see Parameters). It is poorly studied in the literature.

Relatively close High extinction Massive Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P328, along with CWNU_1758.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 558 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–	259.355	-40.275	0.343	-0.727	-1.963	-23.841
Hunt & Reffert	2024	259.372	-40.277	0.346	-0.685	-1.962	3.868
Celli et al.	2024	259.353	-40.276	–	–	–	–
Cavallo et al.	2024	259.354	-40.257	0.345	–	–	–
Hunt & Reffert	2023	259.372	-40.277	0.346	-0.685	-1.962	3.868
Cantat-Gaudin et al.	2020	259.353	-40.276	0.342	-0.734	-1.952	–
Castro-Ginard et al.	2020	259.342	-40.274	0.341	-0.732	-1.958	–

💡 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–	2.59	3.92	2.65	20	-0.100	3016	–	–
Hunt & Reffert	2024	–	–	–	–	–	3788⁽¹⁾	–	–
Celli et al.	2024	–	–	–	7	–	2244	–	–
Cavallo et al.	2024	2.27	4.23	–	35	-0.100	–	–	–
Hunt & Reffert	2023	2.59	3.92	2.65	33	–	–	–	–
Cantat-Gaudin et al.	2020	2.83	3.23	–	7	–	–	–	–

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

Visualization

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