UBC 439

0.38 UTI

0.43

C_N

0.06

C_dens

0.75

C_C3

0.32

C_lit

1.0

C_dup

N_m (P>50%) 43

Core radius and density 4.2 [pc], 0.3 [pc^-2]

C3 classification AB

C_N 0.43 Poorly populated
C_dens 0.06 Very loose
C_C3 0.75 High quality
C_lit 0.32 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 439 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is poorly studied in the literature.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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 439 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–	94.49	10.753	0.302	0.375	-0.965	34.231
Li et al.	2025	94.541	10.752	0.303	0.417	-0.944	–
Almeida et al.	2025	94.546	10.766	–	–	–	–
Zhang et al.	2024	94.47	10.753	–	–	–	–
Hunt & Reffert	2024	94.47	10.753	0.297	0.376	-0.963	34.242
Cavallo et al.	2024	94.543	10.724	0.3	–	–	–
Hunt & Reffert	2023	94.47	10.753	0.297	0.376	-0.963	34.242
Almeida et al.	2023	94.544	10.761	–	–	–	–
Jadhav & Subramaniam	2021	94.541	10.752	–	–	–	–
Dias et al.	2021	94.546	10.766	0.282	0.443	-0.95	–
Cantat-Gaudin et al.	2020	94.541	10.752	0.303	0.417	-0.944	–
Castro-Ginard et al.	2020	94.548	10.753	0.306	0.44	-0.945	–

💡 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–	2.77	1.325	0.82	280	-0.175	450	0.5	0
Li et al.	2025	2.76	1.26	–	323	-0.158	–	–	–
Almeida et al.	2025	2.77	1.40	–	280	–	524	–	–
Zhang et al.	2024	–	–	–	–	-0.254⁽¹⁾	–	–	–
Hunt & Reffert	2024	2.83	1.07	0.82	225	–	429⁽¹⁾	–	–
Cavallo et al.	2024	2.74	1.65	–	209	-0.380	–	–	–
Hunt & Reffert	2023	2.83	1.07	0.82	225	–	–	–	–
Almeida et al.	2023	2.57	1.39	–	287	-0.175	471⁽¹⁾	0.50	–
Jadhav & Subramaniam	2021	3.06	0.81	–	355	–	254	–	0⁽¹⁾
Dias et al.	2021	2.77	1.40	–	280	-0.146	–	–	–
Cantat-Gaudin et al.	2020	3.06	0.81	–	355	–	–	–	–
Kounkel et al.	2020	2.27	1.51	–	182	–	–	–	–

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

Visualization

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