UBC 1558

0.56 UTI

0.46

C_N

0.76

C_dens

1.0

C_C3

0.3

C_lit

1.0

C_dup

N₅₀ (P>50% members) 46

Stellar density (N₅₀/rad) 3.8 [N/pc²]

C3 classification AA

C_N 0.46 Poorly populated
C_dens 0.76 Dense
C_C3 1.0 Very high quality
C_lit 0.3 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 1558 is a poorly populated, dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a metal-rich, young 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 Metal-rich Young

Liu et al. (2025)
Classified as primordial binary cluster 385 along with UBC_1557.

Palma et al. (2025)
Part of multiple system G255, along with UBC_1557, UBC_321 and UBC_550.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 1558 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–	252.759	-45.414	0.393	-1.325	-2.497	-29.268
Hunt & Reffert	2024	252.706	-45.414	0.394	-1.319	-2.503	-23.085
Cavallo et al.	2024	252.769	-45.411	0.392	–	–	–
Hunt & Reffert	2023	252.706	-45.414	0.394	-1.319	-2.503	-23.085
Castro-Ginard et al.	2022	252.78	-45.41	0.38	-1.32	-2.51	–

💡 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–	2.72	2.77	2.42	27	0.940	822	–	–
Liu et al.	2025	6.37	1.00	–	33	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	822⁽¹⁾	–	–
Cavallo et al.	2024	2.36	2.77	–	112	0.940	–	–	–
Hunt & Reffert	2023	2.36	3.24	2.42	21	–	–	–	–
Castro-Ginard et al.	2022	3.08	2.77	–	17	–	–	–	–

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

Visualization

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