Berkeley 21

(MWSC 682; OCL 469; FSR 0875)

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0.92 UTI
0.83
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 304
Radius (P>50% members) 2.1 [arcmin]
  • CN 0.83 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Berkeley 21 is a rich, very dense object of high C3 quality. Its parallax locates it at a large distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, metal-poor, old cluster (see Parameters). It is very well-studied in the literature.

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

Very distant Moderate extinction Massive Metal-poor Old Contains BSS

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Berkeley 21 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 – 87.938 21.808 0.146 0.528 -1.032 1.249
Hu & Soubiran 2025 87.936 21.808 – – – –
Zhang et al. 2024 87.949 21.811 – – – –
Hunt & Reffert 2024 87.949 21.811 0.144 0.506 -1.031 3.88
Cavallo et al. 2024 87.936 21.808 0.145 – – –
Hunt & Reffert 2023 87.949 21.811 0.144 0.506 -1.031 3.88
Just et al. 2023 87.936 21.816 – – – –
Jaehnig et al. 2021 87.94 21.809 0.152 0.468 -0.951 –
Rain et al. 2021 87.93 21.812 0.159 0.562 -1.051 –
Cantat-Gaudin et al. 2020 87.93 21.812 0.159 0.562 -1.051 –
Cantat-Gaudin & Anders 2020 87.93 21.812 0.159 0.562 -1.051 –
Soubiran et al. 2018 87.93 21.812 – – – 0.49
Bica et al. 2019 87.941 21.815 – – – –
Cantat-Gaudin et al. 2018 87.93 21.812 0.159 0.562 -1.051 –
Loktin & Popova 2017 87.93 21.815 – 0.266 -1.085 12.4
Kharchenko et al. 2016 87.936 21.816 – – – –
Dias et al. 2014 87.925 21.783 – 1.47 -5.8 –
Kharchenko et al. 2013 87.945 21.815 – 0.0 -2.29 12.4
Gozha et al. 2012 87.925 21.783 – – – –
Kharchenko et al. 2007 87.93 21.78 – 0.04 – –
van den Bergh 2006 87.925 21.783 – – – –
Chen et al. 2003 87.924 21.782 – – – –
Dias et al. 2002 87.925 21.783 – 1.47 -5.8 -0.6

💡 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
Hu & Soubiran 2025 – – – – -0.200* – – –
Zhang et al. 2024 – – – – -0.263* – – –
Hunt & Reffert 2024 – – – – – 1632* – –
Cavallo et al. 2024 5.94 2.05 – 2089 -0.380 – – –
Hunt & Reffert 2023 5.93 2.50 1.84 881 – – – –
Just et al. 2023 – – – 1995 – 1230 – –
Jaehnig et al. 2021 6.65* – – – – – – –
Rain et al. 2021 5.31 2.36 – 2188 – – – 20
Cantat-Gaudin et al. 2020 6.43 1.96 – 2138 – – – –
Cantat-Gaudin & Anders 2020 5.31 – – – – – – –
Soubiran et al. 2018 5.31 – – – – – – –
Cantat-Gaudin et al. 2018 5.31 – – – – – – –
Loktin & Popova 2017 3.45 1.50 – 1122 – – – –
Kharchenko et al. 2016 5.72 2.06 – 1995 – – – –
Kharchenko et al. 2013 5.72 2.06 – 1995 -0.835 – – –
Gozha et al. 2012 5.00 – – 2188 -0.840 – – –
van den Bergh 2006 5.00 2.36 – 2188 – – – –
Chen et al. 2003 5.00 2.36 – 2180 -0.830* – – –
Dias et al. 2002 5.00 2.36 – 2188 -0.835 – – –

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

Visualization
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Berkeley 21 UCC
Berkeley 21 HUNT23
Berkeley 21 CANTAT20
Galactocentric position diagram