OCSN 3

0.60 UTI

0.8

C_N

1.0

C_dens

0.62

C_C3

0.3

C_lit

1.0

C_dup

N₅₀ (P>50% members) 231

Stellar density (N₅₀/rad) 5.8 [N/pc²]

C3 classification AC

C_N 0.8 Rich
C_dens 1.0 Very dense
C_C3 0.62 Intermediate 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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OCSN 3 is a rich, very dense object of intermediate C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a low-mass, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It was recently reported in the literature.

Very close Low extinction Low mass Near-solar metallicity Intermediate age

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 257 along with HSC_2986.

Palma et al. (2025)
Classified as optical pair P435, along with HSC_157.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for OCSN 3 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–	276.425	-20.389	6.473	7.352	-28.183	-10.747
Hunt & Reffert	2024	276.456	-21.037	6.644	7.265	-28.925	-11.858
Cavallo et al.	2024	276.331	-20.792	6.639	–	–	–
Hunt & Reffert	2023	276.456	-21.037	6.644	7.265	-28.925	-11.858
Qin et al.	2023	276.52	-20.48	6.3	7.31	-26.9	-10.81

💡 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–	0.15	0.4	0.62	310	0.190	48	–	–
Liu et al.	2025	0.15	0.06	–	112	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	48⁽¹⁾	–	–
Cavallo et al.	2024	0.15	0.80	–	339	0.190	–	–	–
Hunt & Reffert	2023	0.15	0.15	0.62	705	–	–	–	–
Qin et al.	2023	0.21	0.65	–	282	–	–	–	–

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

Visualization

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