OCSN 61

0.52 UTI

0.84

C_N

1.0

C_dens

1.0

C_C3

0.35

C_lit

0.74

C_dup

N₅₀ (P>50% members) 340

Stellar density (N₅₀/rad) 18.7 [N/pc²]

C3 classification AA

C_N 0.84 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.35 Poorly studied
C_dup 0.74 Likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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OCSN 61 is a rich, very 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, but with a large variance across recent sources for the absorption parameter (see Parameters). It was recently reported in the literature.

Note: This is likely a unique object, which shares a moderate percentage of members with at least one previously reported entry, and a moderate 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 320 along with UBC_17a, and of multiple system 1 along with UBC_17a and ASCC_19.

Palma et al. (2025)
Part of multiple system G10, along with ASCC_19, ASCC_20, OC_0339 and UBC_17a.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for OCSN 61 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–	84.063	-0.592	2.558	-1.029	-0.633	29.898
Liu et al.	2025	84.08	-0.4	2.59	-1.04	-0.63	26.82
Zhang et al.	2024	84.084	-0.402	–	–	–	–
Hunt & Reffert	2024	84.084	-0.402	2.59	-1.045	-0.63	26.823
Cavallo et al.	2024	84.133	-0.747	2.596	–	–	–
Hunt & Reffert	2023	84.084	-0.402	2.59	-1.045	-0.63	26.823
Qin et al.	2023	84.14	-0.45	2.57	-1.08	-0.62	31.65

💡 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–	0.38	0.19	0.66	15	-0.041	100	–	–
Liu et al.	2025	0.32	0.01	–	27	–	–	–	–
Zhang et al.	2024	–	–	–	–	0.049⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	100⁽¹⁾	–	–
Cavallo et al.	2024	0.39	0.57	–	7	-0.130	–	–	–
Hunt & Reffert	2023	0.37	0.19	0.66	12	–	–	–	–
Qin et al.	2023	0.42	0.19	–	18	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OCSN 194	27.1	83.32	-1.64	2.42	-0.06	-0.25	28.06	0.02
Gulliver 6	26.2	83.34	-1.63	2.41	-0.07	-0.24	28.06	0.69
OC 0340	5.0	84.54	-0.18	2.44	-0.07	-0.62	24.57	0.45
OCSN 65	0.3	83.79	-1.81	2.37	-1.31	0.92	27.08	0.58
OCSN 66	0.3	85.38	-1.87	2.5	0.07	-0.89	24.93	0.44

💡 Note: The % column shows the percentage of members that OCSN 61 shares with each listed object.

Visualization

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