UBC 39

0.41 UTI

0.5

C_N

0.4

C_dens

0.75

C_C3

0.19

C_lit

1.0

C_dup

N_m (P>50%) 50

Core radius and density 1.5 [pc], 2.0 [pc^-2]

C3 classification AB

C_N 0.5 Moderately populated
C_dens 0.4 Loose
C_C3 0.75 High quality
C_lit 0.19 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

UBC 39 is a moderately populated, loose object of 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 parameter (see Parameters). It is rarely studied in the literature.

Note: This object shares a large percentage of members with 3 later reported entries. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.99 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.99 (50th percentile), true positive (human-assigned).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0851, e_all=0.1349.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg30' along with FSR 0534.

Data

🔍 Search references for UBC 39 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	19.847	61.016	0.484	-1.248	-0.212	–
Li et al.	2025	19.817	61.019	0.478	-1.231	-0.157	–
Hunt & Reffert	2024	19.84	61.025	0.481	-1.239	-0.228	–
Cavallo et al.	2024	19.835	61.013	0.483	–	–	–
Hunt & Reffert	2023	19.84	61.025	0.481	-1.239	-0.228	–
Cantat-Gaudin et al.	2020	19.817	61.019	0.478	-1.231	-0.157	–
Cantat-Gaudin & Anders	2020	19.817	61.019	0.478	-1.231	-0.157	–
Castro-Ginard et al.	2019	19.794	61.025	0.478	-1.233	-0.13	–

💡 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–	1.96	1.61	1.61	150	0.026	383	–	–
Li et al.	2025	1.78	1.58	–	346	-0.057	–	–	–
Hunt & Reffert	2024	1.93	1.61	1.61	152	–	383⁽¹⁾	–	–
Cavallo et al.	2024	2.18	1.94	–	98	0.110	–	–	–
Hunt & Reffert	2023	1.93	1.61	1.61	152	–	–	–	–
Cantat-Gaudin et al.	2020	2.04	1.35	–	148	–	–	–	–
Kounkel et al.	2020	1.96	2.06	–	38	–	–	–	–
Cantat-Gaudin & Anders	2020	1.97	–	–	–	–	–	–	–

(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 13510	86.0	19.86	61.01	0.48	-1.25	-0.22	–	0.04
CWWDL 6218	82.0	19.82	61.03	0.5	-1.25	-0.21	–	0.02
OC 0235	60.0	19.82	61.02	0.49	-1.23	-0.22	–	0.0

💡 Note: The % column shows the percentage of members that UBC 39 shares with each listed object.

Visualization

ℹ️

1 2 3