OCSN 4

0.31 UTI

0.27

C_N

0.51

C_dens

0.75

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 27

Stellar density (N₅₀/rad) 2.5 [N/pc²]

C3 classification AB

C_N 0.27 Poorly populated
C_dens 0.51 Moderately dense
C_C3 0.75 High quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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OCSN 4 is a poorly populated, moderately dense object of high C3 quality. Its parallax locates it at a very close^* distance, near the mid-plane, affected by moderate extinction. It is catalogued as a young cluster (see Parameters). It was recently reported in the literature.

(*): The parallax distance estimate (~0.48 kpc) differs significantly from the median photometric distance (~0.71 kpc).

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

Close Moderate extinction Young

Data

🔍 Search references for OCSN 4 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–	272.02	-16.604	2.065	-0.001	-3.873	-12.302
Qin et al.	2023	272.15	-16.51	2.08	0.02	-3.93	-10.09

💡 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–	0.71	1.08	–	89	–	–	–	–
Qin et al.	2023	0.71	1.08	–	89	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Theia 227	88.9	272.02	-16.62	2.08	0.01	-3.87	-12.3	0.01

💡 Note: The % column shows the percentage of members that OCSN 4 shares with each listed object.

Visualization

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