OC 0280

0.22 UTI

0.35

C_N

1.0

C_dens

1.0

C_C3

0.3

C_lit

0.37

C_dup

N₅₀ (P>50% members) 35

Stellar density (N₅₀/rad) 8.8 [N/pc²]

C3 classification AA

C_N 0.35 Poorly populated
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.3 Poorly studied
C_dup 0.37 Possibly duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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OC 0280 is a poorly populated, 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 and metallicity parameters (see Parameters). It is poorly studied in the literature.

⚠️ Warning: This is possibly a duplicate object, which shares a significant percentage of members with at least one previously reported entry. See table with shared members information.

Very close Low extinction Near-solar metallicity Very young

Liu et al. (2025)
Classified as primordial binary cluster 189 along with HSC_1262.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for OC 0280 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–	60.572	32.15	2.647	3.603	-5.211	21.763
Zhang et al.	2024	60.521	32.178	–	–	–	–
Cavallo et al.	2024	60.83	32.629	2.703	–	–	–
Hunt & Reffert	2023	60.521	32.178	2.703	3.628	-5.259	24.98
Hao et al.	2022	60.485	32.232	2.666	3.455	-5.146	–

💡 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–	0.37	0.97	1.31	8	0.170	–	–	–
Liu et al.	2025	0.37	0.25	–	29	–	–	–	–
Zhang et al.	2024	–	–	–	–	0.011⁽¹⁾	–	–	–
Cavallo et al.	2024	0.37	1.26	–	9	0.170	–	–	–
Hunt & Reffert	2023	0.36	0.69	1.31	8	–	–	–	–
Hao et al.	2022	–	1.25	–	6	0.611	–	–	–

(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 285	100.0	60.52	32.25	2.69	3.6	-5.24	20.31	0.31
UBC 31	62.9	60.98	32.35	2.74	3.75	-5.38	18.67	0.7

💡 Note: The % column shows the percentage of members that OC 0280 shares with each listed object.

Visualization

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