OCSN 89

0.41 UTI

0.7

C_N

0.88

C_dens

0.75

C_C3

0.25

C_lit

0.72

C_dup

N₅₀ (P>50% members) 90

Stellar density (N₅₀/rad) 4.4 [N/pc²]

C3 classification AB

C_N 0.7 Moderately populated
C_dens 0.88 Dense
C_C3 0.75 High quality
C_lit 0.25 Poorly studied
C_dup 0.72 Likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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OCSN 89 is a moderately populated, dense object of high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption and age parameters (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. See table with shared members information.

Very close Low extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as primordial binary cluster 323 along with CWNU_1173, and of multiple system 36 along with CWNU_1173 and CWNU_1256.

Palma et al. (2025)
Classified as optical pair P561, along with Theia_246.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data

🔍 Search references for OCSN 89 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–	187.912	-66.011	2.447	-13.577	-2.654	2.59
Liu et al.	2025	186.45	-65.88	2.41	-13.75	-2.68	1.39
Cavallo et al.	2024	188.14	-66.162	2.407	–	–	–
Hunt & Reffert	2023	186.45	-65.883	2.41	-13.751	-2.685	1.392
Qin et al.	2023	188.06	-66.04	2.48	-13.49	-2.96	3.72

💡 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–	0.485	0.87	1.62	42	0.300	–	–	–
Liu et al.	2025	0.55	0.26	–	47	–	–	–	–
Cavallo et al.	2024	0.42	1.01	–	22	0.300	–	–	–
Hunt & Reffert	2023	0.40	0.73	1.62	37	–	–	–	–
Qin et al.	2023	0.66	1.27	–	141	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Theia 246	27.8	188.39	-65.99	2.45	-13.57	-2.62	5.37	0.15
CWNU 1103	2.2	186.85	-66.53	2.23	-14.94	-2.89	-11.11	0.21

💡 Note: The % column shows the percentage of members that OCSN 89 shares with each listed object.

Visualization

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