OC 0123

0.02 UTI

0.36

C_N

0.98

C_dens

0.38

C_C3

0.25

C_lit

0.06

C_dup

N₅₀ (P>50% members) 36

Stellar density (N₅₀/rad) 4.9 [N/pc²]

C3 classification CB

C_N 0.36 Poorly populated
C_dens 0.98 Very dense
C_C3 0.38 Low quality
C_lit 0.25 Poorly studied
C_dup 0.06 Very likely duplicate

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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OC 0123 is a poorly populated, very dense object of low C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.

⚠️ Warning: This is very likely a duplicate object, which shares a large percentage of members with at least one previously reported entry, and a moderate percentage with at least one entry reported in the same catalogue. See table with shared members information.

Relatively close High extinction Near-solar metallicity Very young

Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P57, along with HSC_626.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for OC 0123 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–	306.353	40.849	0.559	-3.026	-4.732	-20.579
Hunt & Reffert	2024	306.356	40.895	0.547	-3.047	-4.733	-20.622
Cavallo et al.	2024	306.353	40.853	0.549	–	–	–
Hunt & Reffert	2023	306.356	40.895	0.547	-3.047	-4.733	-20.622
Hao et al.	2022	306.321	40.793	0.551	-3.005	-4.828	–

💡 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–	1.8	3.24	2.39	11	0.370	280	–	–
Hunt & Reffert	2024	–	–	–	–	–	280⁽¹⁾	–	–
Cavallo et al.	2024	1.86	3.24	–	10	0.130	–	–	–
Hunt & Reffert	2023	1.74	3.17	2.39	11	–	–	–	–
Hao et al.	2022	–	3.67	–	13	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
FoF 503	94.4	306.37	40.88	0.51	-3.06	-4.57	-13.11	0.55
OC 0124	44.4	306.41	40.91	0.51	-3.1	-4.18	45.72	0.07

💡 Note: The % column shows the percentage of members that OC 0123 shares with each listed object.

Visualization

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