Berkeley 20

(MWSC 572; OCL 497)

0.96 UTI

0.8

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

C3 classification AA

Number of members (P>50%) 224

Radius (P>50% members) 1.3 [arcmin]

C_N 0.8 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very 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 20 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very large distance, well below the mid-plane, affected by low extinction. It is catalogued as a massive, metal-poor, very old cluster, but with a large variance across recent sources for the distance, age, metallicity, and mass parameters (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 Metal-poor Very old Contains BSS

Cavallo et al. (2024)
Silver sample.

Data

🔍 Search references for Berkeley 20 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	–	83.153	0.186	0.1	0.869	-0.231	79.133
Zhang et al.	2024	83.154	0.188	–	–	–	–
Hunt & Reffert	2024	83.154	0.188	0.094	0.827	-0.246	78.888
Cavallo et al.	2024	83.142	0.177	0.116	–	–	–
Hunt & Reffert	2023	83.154	0.188	0.094	0.827	-0.246	78.888
Just et al.	2023	83.147	0.184	–	–	–	–
Jaehnig et al.	2021	83.155	0.189	0.045	0.82	-0.259	–
Rain et al.	2021	83.152	0.185	0.04	0.808	-0.244	–
Cantat-Gaudin et al.	2020	83.152	0.185	0.04	0.808	-0.244	–
Donor et al.	2020	83.154	0.183	–	1.04	-0.16	78.8
Cantat-Gaudin & Anders	2020	83.152	0.185	0.04	0.808	-0.244	–
Bica et al.	2019	83.16	0.184	–	–	–	–
Cantat-Gaudin et al.	2018	83.152	0.185	0.04	0.808	-0.244	–
Loktin & Popova	2017	83.16	-0.188	–	1.51	-4.11	75.7
Kharchenko et al.	2016	83.147	0.184	–	–	–	–
Kharchenko et al.	2013	83.154	0.183	–	-1.62	-4.26	75.7
Gozha et al.	2012	83.154	0.188	–	–	–	–
Kharchenko et al.	2007	83.16	0.19	–	0.02	–	–
van den Bergh	2006	83.25	0.217	–	–	–	–
Chen et al.	2003	83.248	0.21	–	–	–	–
Dias et al.	2002	83.154	0.188	–	1.51	-4.11	70.0

💡 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
Zhang et al.	2024	–	–	–	–	-0.355*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	834*	–	–
Cavallo et al.	2024	4.02	1.35	–	6166	-0.720	–	–	–
Hunt & Reffert	2023	7.99	0.46	1.69	1841	–	–	–	–
Just et al.	2023	–	–	–	6026	–	2972	–	–
Jaehnig et al.	2021	14.23*	–	–	–	–	–	–	–
Rain et al.	2021	14.40	0.37	–	6026	–	–	–	6
Cantat-Gaudin et al.	2020	8.71	0.37	–	4786	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.400	–	–	–
Cantat-Gaudin & Anders	2020	14.40	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	14.40	–	–	–	–	–	–	–
Loktin & Popova	2017	8.80	4.65	–	5358	–	–	–	–
Kharchenko et al.	2016	8.40	0.38	–	6026	–	–	–	–
Kharchenko et al.	2013	8.40	0.38	–	6026	-0.610	–	–	–
Gozha et al.	2012	8.40	–	–	6026	-0.610	–	–	–
van den Bergh	2006	8.40	0.37	–	6026	–	–	–	–
Chen et al.	2003	8.40	0.37	–	6020	-0.750*	–	–	–
Dias et al.	2002	8.40	0.37	–	6026	-0.300	–	–	–

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

Visualization

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