OCSN 65

0.45 UTI

0.81

C_N

0.61

C_dens

1.0

C_C3

0.16

C_lit

0.82

C_dup

N_m (P>50%) 255

Core radius and density 3.2 [pc], 3.1 [pc^-2]

C3 classification AA

C_N 0.81 Rich
C_dens 0.61 Moderately dense
C_C3 1.0 Very high quality
C_lit 0.16 Rarely studied
C_dup 0.82 Very likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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OCSN 65 is a rich, moderately dense object of very high C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young cluster (see Parameters). It was recently reported in the literature.

Note: This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry, and a small percentage with at least one entry reported in the same catalogue. See table with shared members information.

Very close Low extinction Near-solar metallicity Very young

Liu et al. (2025)
Classified as primordial binary cluster 321 along with Theia_13, and of multiple system 3 along with ASCC_18, Sigma_Orionis, CWNU_1054 and Theia_13.

Palma et al. (2025)
Part of multiple system G229, along with OCSN_56, Theia_13, CWNU_1072, Sigma_Orionis, CWNU_1088, ASCC_18 and OCSN_68.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for OCSN 65 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–	83.789	-1.805	2.366	-1.311	0.921	27.08
Liu et al.	2025	83.76	-2.16	2.36	-1.26	0.93	33.16
Zhang et al.	2024	83.764	-2.155	–	–	–	–
Swiggum et al.	2024	83.764	-2.155	2.365	-1.258	0.93	29.539
Hunt & Reffert	2024	83.764	-2.155	2.365	-1.258	0.93	33.161
Cavallo et al.	2024	83.749	-1.836	2.362	–	–	–
Hunt & Reffert	2023	83.764	-2.155	2.365	-1.258	0.93	33.161
Qin et al.	2023	83.88	-1.79	2.37	-1.34	0.93	26.34

💡 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–	0.43	0.36	0.58	13	-0.162	66	–	–
Liu et al.	2025	0.48	0.14	–	19	–	–	–	–
Zhang et al.	2024	–	–	–	–	-0.133⁽¹⁾	–	–	–
Swiggum et al.	2024	0.42	–	–	13	–	79	–	–
Hunt & Reffert	2024	0.41	0.36	0.58	13	–	52⁽¹⁾	–	–
Cavallo et al.	2024	0.44	0.85	–	5	-0.190	–	–	–
Hunt & Reffert	2023	0.41	0.36	0.58	13	–	–	–	–
Qin et al.	2023	0.52	0.60	–	14	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Gulliver 6	17.6	83.34	-1.63	2.41	-0.07	-0.24	28.06	0.6
OCSN 194	14.5	83.32	-1.64	2.42	-0.06	-0.25	28.06	0.02
OCSN 61	0.4	84.06	-0.59	2.56	-1.03	-0.63	29.9	0.44

💡 Note: The % column shows the percentage of members that OCSN 65 shares with each listed object.

Visualization

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