UBC 339

0.49 UTI

0.52

C_N

0.5

C_dens

1.0

C_C3

0.23

C_lit

1.0

C_dup

N_m (P>50%) 53

Core radius and density 1.6 [pc], 2.5 [pc^-2]

C3 classification AA

C_N 0.52 Moderately populated
C_dens 0.5 Moderately dense
C_C3 1.0 Very high quality
C_lit 0.23 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 339 is a moderately populated, moderately dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is rarely studied in the literature.

Note: This object shares a significant percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.93 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.93 (50th percentile).

Data

🔍 Search references for UBC 339 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–	271.309	-23.318	0.394	0.617	-0.608	-21.272
Almeida et al.	2025	271.309	-23.307	–	–	–	–
Hunt & Reffert	2024	271.313	-23.308	0.399	0.626	-0.608	-21.269
Cavallo et al.	2024	271.302	-23.328	0.399	–	–	–
Hunt & Reffert	2023	271.313	-23.308	0.399	0.626	-0.608	-21.269
Jadhav & Subramaniam	2021	271.308	-23.308	–	–	–	–
Dias et al.	2021	271.309	-23.307	0.392	0.572	-0.557	–
Cantat-Gaudin et al.	2020	271.308	-23.308	0.386	0.559	-0.585	–
Castro-Ginard et al.	2020	271.311	-23.308	0.387	0.571	-0.594	–

💡 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–	2.34	2.44	2.07	416	-0.348	290	–	0
Almeida et al.	2025	2.41	2.34	–	661	–	290	–	–
Hunt & Reffert	2024	2.34	2.54	2.07	171	–	443⁽¹⁾	–	–
Cavallo et al.	2024	1.61	2.88	–	112	-0.820	–	–	–
Hunt & Reffert	2023	2.34	2.54	2.07	171	–	–	–	–
Jadhav & Subramaniam	2021	2.34	1.65	–	1000	–	188	–	0⁽¹⁾
Dias et al.	2021	2.41	2.34	–	661	0.123	–	–	–
Cantat-Gaudin et al.	2020	2.34	1.65	–	1000	–	–	–	–
Kounkel et al.	2020	2.05	3.28	–	87	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 5684	67.9	271.31	-23.31	0.4	0.62	-0.58	-21.27	0.0

💡 Note: The % column shows the percentage of members that UBC 339 shares with each listed object.

Visualization

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