Berkeley 1

(MWSC 20)

0.89 UTI

0.68

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 86

Radius (P>50% members) 1.5 [arcmin]

C_N 0.68 Moderately populated
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 1 is a moderately populated, very dense 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, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is very well-studied in the literature.

Distant Moderate extinction Near-solar metallicity Intermediate age

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 1 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	–	2.453	60.476	0.229	-2.709	-0.227	-49.212
Almeida et al.	2025	2.445	60.469	–	–	–	–
Hunt & Reffert	2024	2.456	60.471	0.24	-2.707	-0.247	-60.092
Cavallo et al.	2024	2.465	60.477	0.241	–	–	–
Hunt & Reffert	2023	2.456	60.471	0.24	-2.707	-0.247	-60.092
Almeida et al.	2023	2.454	60.469	–	–	–	–
Just et al.	2023	2.391	60.463	–	–	–	–
Dias et al.	2021	2.445	60.469	0.241	-2.776	-0.18	–
Cantat-Gaudin et al.	2020	2.449	60.476	0.235	-2.758	-0.173	–
Sánchez et al.	2020	2.4	60.475	–	-2.726	-0.101	–
Cantat-Gaudin & Anders	2020	2.449	60.476	0.235	-2.758	-0.173	–
Soubiran et al.	2018	2.449	60.476	–	–	–	-59.97
Cantat-Gaudin et al.	2018	2.449	60.476	0.235	-2.758	-0.173	–
Loktin & Popova	2017	2.4	60.475	–	-0.194	-1.944	–
Kharchenko et al.	2016	2.391	60.463	–	–	–	–
Dias et al.	2014	2.4	60.475	–	-1.83	-0.75	–
Kharchenko et al.	2013	2.4	60.467	–	-0.27	-2.3	–
Gozha et al.	2012	2.4	60.475	–	–	–	–
Kharchenko et al.	2012	2.4	60.467	–	0.05	-2.13	–
Dias et al.	2002	2.4	60.475	–	-1.83	-0.75	–

💡 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
Almeida et al.	2025	3.50	2.15	–	15	–	444	–	–
Hunt & Reffert	2024	–	–	–	–	–	413*	–	–
Cavallo et al.	2024	2.79	1.78	–	269	-0.270	–	–	–
Hunt & Reffert	2023	3.77	1.88	0.61	101	–	–	–	–
Almeida et al.	2023	3.54	2.05	–	151	-0.141	617*	0.82	–
Just et al.	2023	–	–	–	398	–	1702	–	–
Dias et al.	2021	3.50	2.15	–	15	-0.090	–	–	–
Cantat-Gaudin et al.	2020	3.78	1.52	–	302	–	–	–	–
Cantat-Gaudin & Anders	2020	3.78	–	–	–	–	–	–	–
Soubiran et al.	2018	3.78	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.78	–	–	–	–	–	–	–
Loktin & Popova	2017	2.23	1.05	–	631	–	–	–	–
Kharchenko et al.	2016	10.30	2.80	–	398	–	–	–	–
Kharchenko et al.	2013	10.30	2.80	–	398	–	–	–	–
Gozha et al.	2012	2.42	–	–	398	-0.140	–	–	–
Kharchenko et al.	2012	10.30	2.80	–	398	–	–	–	–
Dias et al.	2002	2.42	2.42	–	398	–	–	–	–

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

Visualization

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