OCSN 12

0.10 UTI

0.0

C_N

0.15

C_dens

0.38

C_C3

0.0

C_lit

1.0

C_dup

C3 classification CB

Number of members (P>50%) 24

Radius (P>50% members) 43.1 [arcmin]

C_N 0.0 Sparse
C_dens 0.15 Very loose
C_C3 0.38 Low quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 SciX 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

OCSN 12 is a sparse, very loose object of low 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, young cluster, but with a large variance across recent sources for the age parameter (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 Young

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

Cavallo et al. (2024): Gold sample.

Data

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	–	276.366	21.462	2.199	-1.367	-6.201	-20.252
Cavallo et al.	2024	276.819	21.485	2.159	–	–	–
Hunt & Reffert	2023	276.514	21.421	2.166	-1.231	-6.274	-19.327
Qin et al.	2023	276.54	21.08	2.31	-1.45	-6.09	-17.25

💡 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]	Bfr	BSS
Cavallo et al.	2024	0.49	0.85	–	30	0.260	–	–	–
Hunt & Reffert	2023	0.45	0.33	0.63	187	–	–	–	–
Qin et al.	2023	0.55	0.53	–	28	–	–	–	–

💡 Note: The parameters are sometimes transformed from their original values to match the format of the columns shown here, see FAQ. The columns DAv, Bfr, BSS correspond to differential extinction, binary fraction, and blue stragglers, respectively. BSS values can be listed as fractions or integers.

Visualization

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💡 Note: How are the galactocentric plots generated? See FAQ.