OCSN 15

0.23 UTI

0.25

C_N

0.41

C_dens

0.5

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 25

Stellar density (N₅₀/rad) 2.0 [N/pc²]

C3 classification DA

C_N 0.25 Poorly populated
C_dens 0.41 Loose
C_C3 0.5 Intermediate 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 15 is a poorly populated, loose object of intermediate C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It was recently reported in the literature.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Very close Low extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for OCSN 15 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–	285.173	27.257	4.039	-5.441	-4.304	-28.158
Cavallo et al.	2024	284.557	27.003	4.02	–	–	–
Hunt & Reffert	2023	285.099	27.19	4.016	-5.538	-4.532	-27.359
Qin et al.	2023	284.96	27.34	3.88	-5.05	-4.03	-25.61

💡 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–	0.26	0.61	0.33	135	0.380	–	–	–
Cavallo et al.	2024	0.26	0.61	–	135	0.380	–	–	–
Hunt & Reffert	2023	0.25	0.20	0.33	144	–	–	–	–
Qin et al.	2023	0.31	0.62	–	126	–	–	–	–

Visualization

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