Berkeley 31

(MWSC 1032; Biurakan 7; OCL 513; FSR 1012)

0.92 UTI

0.85

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 375

Radius (P>50% members) 1.7 [arcmin]

C3 classification AB

C_N 0.85 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 1.0 Very well-studied
C_dup 1.0 Unique

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

Overview

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

Note: This object contains blue stragglers according to at least one source.

Very distant Low extinction Massive Near-solar metallicity Old Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Berkeley 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	99999–	104.407	8.285	0.141	0.147	-0.932	61.314
Li et al.	2025	104.406	8.285	0.141	0.169	-0.926	–
Hu & Soubiran	2025	104.407	8.288	–	–	–	–
Almeida et al.	2025	104.396	8.281	–	–	–	–
Zhang et al.	2024	104.407	8.288	–	–	–	–
Hunt & Reffert	2024	104.407	8.288	0.123	0.114	-0.922	65.271
Cavallo et al.	2024	104.407	8.288	0.127	–	–	–
Hunt & Reffert	2023	104.407	8.288	0.123	0.114	-0.922	65.271
Just et al.	2023	104.388	8.299	–	–	–	–
Jaehnig et al.	2021	104.406	8.279	0.172	0.055	-0.884	–
Rain et al.	2021	104.406	8.285	0.141	0.169	-0.926	–
Dias et al.	2021	104.396	8.281	0.128	0.178	-0.905	–
Cantat-Gaudin et al.	2020	104.406	8.285	0.141	0.169	-0.926	–
Sánchez et al.	2020	104.4	8.267	–	0.347	-0.879	–
Donor et al.	2020	104.395	8.298	–	0.24	-1.08	59.6
Cantat-Gaudin & Anders	2020	104.406	8.285	0.141	0.169	-0.926	–
Bica et al.	2019	104.399	8.292	–	–	–	–
Cantat-Gaudin et al.	2018	104.406	8.285	0.141	0.169	-0.926	–
Loktin & Popova	2017	104.4	8.268	–	-2.43	-2.33	61.0
Kharchenko et al.	2016	104.388	8.299	–	–	–	–
Dias et al.	2014	104.4	8.267	–	-2.43	-2.33	–
Kharchenko et al.	2013	104.395	8.298	–	-1.06	-5.13	61.0
Gozha et al.	2012	104.4	8.267	–	–	–	–
Kharchenko et al.	2007	104.4	8.27	–	0.04	–	–
van den Bergh	2006	104.4	8.267	–	–	–	–
Chen et al.	2003	104.378	8.288	–	-4.3	-3.97	61.0
Dias et al.	2002	104.4	8.267	–	-2.43	-2.33	55.7

💡 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–	6.24	0.25	2.12	2056	-0.400	1520	–	6.0
Li et al.	2025	6.05	0.78	–	2088	-0.431	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.290⁽⁵⁾	–	–	–
Almeida et al.	2025	6.18	0.36	–	3690	–	1520	–	–
Zhang et al.	2024	–	–	–	–	-0.289⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	1131⁽¹⁾	–	–
Cavallo et al.	2024	4.45	0.52	–	3890	-0.410	–	–	–
Hunt & Reffert	2023	6.03	0.43	2.12	1191	–	–	–	–
Just et al.	2023	–	–	–	1995	–	1629	–	–
Jaehnig et al.	2021	6.29⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	5.90	0.25	–	2042	–	–	–	6
Dias et al.	2021	6.18	0.36	–	3690	-0.129	–	–	–
Cantat-Gaudin et al.	2020	7.18	0.35	–	2818	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.450	–	–	–
Cantat-Gaudin & Anders	2020	5.90	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	5.90	–	–	–	–	–	–	–
Loktin & Popova	2017	8.27	0.25	–	2056	–	–	–	–
Kharchenko et al.	2016	6.24	0.23	–	1995	–	–	–	–
Kharchenko et al.	2013	6.24	0.23	–	1995	-0.400	–	–	–
Gozha et al.	2012	8.27	–	–	2056	-0.400	–	–	–
van den Bergh	2006	8.27	0.25	–	2042	–	–	–	–
Chen et al.	2003	8.27	0.25	–	2050	-0.500⁽¹⁾	–	–	–
Dias et al.	2002	8.27	0.25	–	2056	-0.400	–	–	–

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

Visualization

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