Berkeley 2

(MWSC 41; OCL 289; FSR 0489)

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0.92 UTI
0.86
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 399
Radius (P>50% members) 1.9 [arcmin]
  • CN 0.86 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 2 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, near-solar metallicity, intermediate-age cluster (see Parameters). It is very well-studied in the literature.

(*): The parallax distance estimate (~7.41 kpc) differs significantly from the median photometric distance (~5.58 kpc).

Very distant Moderate extinction Massive 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 2 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 – 6.317 60.392 0.135 -1.113 -0.369 -77.548
Hu & Soubiran 2025 6.321 60.394 – – – –
Almeida et al. 2025 6.319 60.394 – – – –
Hunt & Reffert 2024 6.322 60.391 0.147 -1.134 -0.394 -77.716
Cavallo et al. 2024 6.321 60.394 0.131 – – –
Hunt & Reffert 2023 6.322 60.391 0.147 -1.134 -0.394 -77.716
Just et al. 2023 6.307 60.379 – – – –
Dias et al. 2021 6.319 60.394 0.123 -1.091 -0.301 –
Cantat-Gaudin et al. 2020 6.319 60.392 0.117 -1.101 -0.304 –
Cantat-Gaudin & Anders 2020 6.319 60.392 0.117 -1.101 -0.304 –
Soubiran et al. 2018 6.319 60.392 – – – -76.35
Bica et al. 2019 6.311 60.397 – – – –
Cantat-Gaudin et al. 2018 6.319 60.392 0.117 -1.101 -0.304 –
Kharchenko et al. 2016 6.307 60.379 – – – –
Dias et al. 2014 6.325 60.4 – 0.26 -3.41 –
Kharchenko et al. 2013 6.316 60.382 – 1.07 -2.68 –
Gozha et al. 2012 6.325 60.4 – – – –
Kharchenko et al. 2012 6.316 60.382 – 0.88 -2.5 –
van den Bergh 2006 6.325 60.4 – – – –
Dias et al. 2002 6.325 60.4 – 0.88 -2.5 –

💡 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 – – – – -0.310* – – –
Almeida et al. 2025 6.95 2.56 – 681 – 1589 – –
Hunt & Reffert 2024 – – – – – 3857* – –
Cavallo et al. 2024 4.81 2.16 – 1445 -0.120 – – –
Hunt & Reffert 2023 5.66 2.33 1.96 598 – – – –
Just et al. 2023 – – – 955 – 1409 – –
Dias et al. 2021 6.95 2.56 – 681 -0.160 – – –
Cantat-Gaudin et al. 2020 6.92 2.34 – 589 – – – –
Cantat-Gaudin & Anders 2020 6.83 – – – – – – –
Soubiran et al. 2018 6.83 – – – – – – –
Cantat-Gaudin et al. 2018 6.83 – – – – – – –
Kharchenko et al. 2016 5.50 2.79 – 955 – – – –
Kharchenko et al. 2013 5.50 2.79 – 955 – – – –
Gozha et al. 2012 5.25 – – 794 -0.590 – – –
Kharchenko et al. 2012 5.50 2.79 – 977 – – – –
van den Bergh 2006 5.25 2.48 – 794 – – – –
Dias et al. 2002 5.25 2.48 – 794 – – – –

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

Visualization
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Berkeley 2 UCC
Berkeley 2 HUNT23
Berkeley 2 CANTAT20
Galactocentric position diagram