OC 0158

0.03 UTI

0.0

C_N

0.24

C_dens

0.5

C_C3

0.25

C_lit

0.12

C_dup

N₅₀ (P>50% members) 24

Stellar density (N₅₀/rad) 1.2 [N/pc²]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.24 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.25 Poorly studied
C_dup 0.12 Likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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OC 0158 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a metal-rich, very young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is poorly studied in the literature.

⚠️ Warning: This is likely a duplicate object, which shares a large percentage of members with at least one previously reported entry. See table with shared members information.

Close Moderate extinction Metal-rich Very young

Liu et al. (2025)
Classified as primordial binary cluster 174 along with HSC_764, and as primordial binary cluster 302 along with Riddle_6, and of multiple system 49 along with Riddle_6 and HSC_764.

Palma et al. (2025)
Part of multiple system G222, along with Riddle_6 and HSC_764.

Data

🔍 Search references for OC 0158 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–	318.24	59.51	1.164	-2.539	-3.51	-24.645
Liu et al.	2025	318.74	59.32	1.17	-2.51	-3.52	-37.92
Hunt & Reffert	2024	318.742	59.319	1.17	-2.513	-3.52	-37.923
Hunt & Reffert	2023	318.742	59.319	1.17	-2.513	-3.52	-37.923
Hao et al.	2022	318.683	59.321	1.154	-2.614	-3.543	–

💡 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–	0.815	1.05	0.64	13	0.575	87	–	–
Liu et al.	2025	0.79	0.30	–	50	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	87⁽¹⁾	–	–
Hunt & Reffert	2023	0.84	1.05	0.64	9	–	–	–	–
Hao et al.	2022	–	2.09	–	13	0.575	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Riddle 6	88.0	318.03	59.9	1.17	-2.53	-3.51	-23.22	0.67
CWNU 1192	72.0	318.54	59.41	1.16	-2.51	-3.5	-25.37	0.02
UBC 385	20.0	317.94	60.02	1.18	-2.53	-3.51	-17.86	0.0

💡 Note: The % column shows the percentage of members that OC 0158 shares with each listed object.

Visualization

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