UBC 31

0.72 UTI

0.75

C_N

0.67

C_dens

1.0

C_C3

0.6

C_lit

1.0

C_dup

C3 classification AA

Number of members (P>50%) 113

Radius (P>50% members) 54.7 [arcmin]

C_N 0.75 Rich
C_dens 0.67 Moderately dense
C_C3 1.0 Very high quality
C_lit 0.6 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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UBC 31 is a rich, moderately dense object of very high C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is moderately studied in the literature.

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

Very close Low extinction Near-solar metallicity Young

Data

🔍 Search references for UBC 31 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	–	60.977	32.349	2.74	3.748	-5.384	18.669
Li et al.	2025	61.146	32.532	2.723	3.803	-5.468	–
Alfonso et al.	2024	60.738	32.481	2.725	3.689	-5.349	–
Celli et al.	2024	61.146	32.532	–	–	–	–
Almeida et al.	2023	61.1	32.848	–	–	–	–
He et al.	2022	60.384	33.164	2.725	3.487	-5.336	–
Dias et al.	2021	61.111	32.843	2.725	3.741	-5.42	20.259
Cantat-Gaudin et al.	2020	61.146	32.532	2.723	3.803	-5.468	–
Cantat-Gaudin & Anders	2020	61.146	32.532	2.723	3.803	-5.468	–
Bica et al.	2019	61.119	32.785	–	–	–	–
Castro-Ginard et al.	2018	61.119	32.775	2.705	3.78	-5.437	22.74

💡 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]	Bfr	BSS
Li et al.	2025	0.41	0.96	–	9	-0.028	–	–	–
Alfonso et al.	2024	0.34	0.18	–	15	0.425	–	–	–
Celli et al.	2024	–	–	–	26	–	279	–	–
Almeida et al.	2023	0.32	0.85	–	21	-0.128	358*	0.39	–
He et al.	2022	–	0.75	–	11	–	–	–	–
Dias et al.	2021	0.38	1.57	–	26	0.425	–	–	–
Cantat-Gaudin et al.	2020	0.34	0.18	–	26	–	–	–	–
Cantat-Gaudin & Anders	2020	0.36	–	–	–	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OCSN 285	65.5	60.52	32.25	2.69	3.6	-5.24	20.31	0.31
OC 0280	19.5	60.57	32.15	2.65	3.6	-5.21	21.76	0.21
CWNU 442	7.1	63.19	31.6	2.78	3.68	-5.65	19.87	0.4

💡 Note: The % column shows the percentage of members that UBC 31 shares with each listed object.

Visualization

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