UBC 51

0.67 UTI

0.76

C_N

0.63

C_dens

0.75

C_C3

0.61

C_lit

1.0

C_dup

N_m (P>50%) 123

Core radius and density 1.3 [pc], 3.1 [pc^-2]

C3 classification AB

C_N 0.76 Rich
C_dens 0.63 Moderately dense
C_C3 0.75 High quality
C_lit 0.61 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 51 is a rich, moderately dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate 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 moderately studied in the literature.

Relatively close Moderate extinction Near-solar metallicity Very young

Li et al. (2026)
Tidal & Core radii: r_t=32+/-35.0 [pc], r_c=0.45+/-0.01 [pc]; stars within r_t: N~118

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 186 along with HSC_1202.

Palma et al. (2025)
Part of multiple system G105, along with HSC_1202 and HSC_1193.

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.3118, e_all=0.3076.

Data

🔍 Search references for UBC 51 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–	59.648	52.523	0.91	-0.28	-1.318	-10.009
Li et al.	2026	59.62	52.53	–	–	–	–
Li et al.	2025	59.648	52.56	0.879	-0.279	-1.275	–
Almeida et al.	2025	59.689	52.55	–	–	–	–
Zhang et al.	2024	59.769	52.642	–	–	–	–
Hunt & Reffert	2024	59.769	52.642	0.926	-0.258	-1.354	-8.154
Celli et al.	2024	59.668	52.559	–	–	–	–
Cavallo et al.	2024	59.614	52.509	0.92	–	–	–
Hunt & Reffert	2023	59.769	52.642	0.926	-0.258	-1.354	-8.154
He et al.	2022	59.575	52.495	0.919	-0.28	-1.328	–
Fu et al.	2022	59.668	52.559	–	–	–	-14.646
Dias et al.	2021	59.689	52.55	0.863	-0.268	-1.312	–
Cantat-Gaudin et al.	2020	59.648	52.56	0.879	-0.279	-1.275	–
Cantat-Gaudin & Anders	2020	59.648	52.56	0.879	-0.279	-1.275	–
Castro-Ginard et al.	2019	59.668	52.559	0.881	-0.232	-1.366	–

💡 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–	1.06	1.315	1.76	10	-0.191	211	–	–
Liu et al.	2025	1.47	0.40	–	15	–	–	–	–
Li et al.	2025	0.96	1.19	–	12	-0.339	–	–	–
Almeida et al.	2025	1.11	1.39	–	10	–	211	–	–
Zhang et al.	2024	–	–	–	–	-0.191⁽¹⁾	–	–	–
Hunt & Reffert	2024	1.04	1.24	1.76	6	–	334⁽¹⁾	–	–
Celli et al.	2024	–	–	–	10	–	193	–	–
Cavallo et al.	2024	1.05	1.40	–	5	-0.200	–	–	–
Hunt & Reffert	2023	1.04	1.24	1.76	6	–	–	–	–
He et al.	2022	–	1.85	–	8	–	–	–	–
Fu et al.	2022	–	–	–	–	0.043	–	–	–
Dias et al.	2021	1.11	1.39	–	10	-0.109	–	–	–
Cantat-Gaudin et al.	2020	1.05	0.79	–	10	–	–	–	–
Kounkel et al.	2020	1.07	1.52	–	14	–	–	–	–
Cantat-Gaudin & Anders	2020	1.10	–	–	–	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Visualization

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