UBC 502

0.66 UTI

0.64

C_N

0.81

C_dens

0.75

C_C3

0.55

C_lit

1.0

C_dup

N_m (P>50%) 78

Core radius and density 1.4 [pc], 4.1 [pc^-2]

C3 classification AB

C_N 0.64 Moderately populated
C_dens 0.81 Dense
C_C3 0.75 High quality
C_lit 0.55 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 502 is a moderately populated, dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is moderately studied in the literature.

Relatively close Low extinction Near-solar metallicity Intermediate age

Li et al. (2026)
Tidal & Core radii: r_t=165+/-62.1 [pc], r_c=0.32+/-0.0 [pc]; stars within r_t: N~134

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 361 along with Theia_2151.

Palma et al. (2025)
Classified as optical pair P171, along with Theia_2151.

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

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).

Data

🔍 Search references for UBC 502 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–	159.591	-59.54	0.541	-5.717	2.08	9.298
Li et al.	2026	159.59	-59.55	–	–	–	–
Li et al.	2025	159.583	-59.54	0.541	-5.712	2.068	–
Almeida et al.	2025	159.561	-59.536	–	–	–	–
Hunt & Reffert	2024	159.592	-59.535	0.537	-5.732	2.08	12.773
Cavallo et al.	2024	159.599	-59.547	0.537	–	–	–
Hunt & Reffert	2023	159.592	-59.535	0.537	-5.732	2.08	12.773
Almeida et al.	2023	159.551	-59.534	–	–	–	–
Jadhav & Subramaniam	2021	159.583	-59.54	–	–	–	–
Dias et al.	2021	159.561	-59.536	0.53	-5.73	2.075	–
Cantat-Gaudin et al.	2020	159.583	-59.54	0.541	-5.712	2.068	–
Castro-Ginard et al.	2020	159.558	-59.538	0.541	-5.727	2.056	–

💡 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–	1.77	0.51	0.92	314	0.196	264	0.67	0
Liu et al.	2025	2.56	0.32	–	309	–	–	–	–
Li et al.	2025	1.81	0.24	–	683	0.230	–	–	–
Almeida et al.	2025	1.79	0.80	–	309	–	199	–	–
Hunt & Reffert	2024	1.75	0.49	0.92	314	–	371⁽¹⁾	–	–
Cavallo et al.	2024	1.92	0.90	–	372	0.540	–	–	–
Hunt & Reffert	2023	1.75	0.49	0.92	314	–	–	–	–
Almeida et al.	2023	1.68	0.75	–	476	0.011	330⁽¹⁾	0.67	–
Jadhav & Subramaniam	2021	1.77	0.51	–	398	–	152	–	0⁽¹⁾
Dias et al.	2021	1.79	0.80	–	309	0.162	–	–	–
Cantat-Gaudin et al.	2020	1.77	0.51	–	398	–	–	–	–
Kounkel et al.	2020	1.52	1.17	–	155	–	–	–	–

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

Visualization

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