Berkeley 4

(MWSC 73; OCL 307)

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0.91 UTI
0.8
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 220
Radius (P>50% members) 4.3 [arcmin]
  • CN 0.8 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
ℹī¸
Berkeley 4 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption, age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This object shares a moderate percentage of members with 3 later reported entries. See table with shared members information.

Distant Moderate extinction Near-solar metallicity Very young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Berkeley 4 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 11.299 64.391 0.305 -2.402 -0.309 -60.436
Li et al. 2025 11.291 64.391 0.296 -2.421 -0.236 –
Almeida et al. 2025 11.273 64.389 – – – –
Hunt & Reffert 2024 11.299 64.39 0.306 -2.409 -0.298 -63.639
Celli et al. 2024 11.284 64.392 – – – –
Cavallo et al. 2024 11.293 64.397 0.306 – – –
Hunt & Reffert 2023 11.299 64.39 0.306 -2.409 -0.298 -63.639
Almeida et al. 2023 11.277 64.389 – – – –
Just et al. 2023 11.257 64.379 – – – –
Dias et al. 2021 11.273 64.389 0.291 -2.427 -0.233 –
Cantat-Gaudin et al. 2020 11.291 64.391 0.296 -2.421 -0.236 –
Cantat-Gaudin & Anders 2020 11.291 64.391 0.296 -2.421 -0.236 –
Dias et al. 2019 11.254 64.385 0.284 -2.421 -0.269 -53.13
Soubiran et al. 2018 11.291 64.391 – – – -53.13
Bica et al. 2019 11.282 64.393 – – – –
Cantat-Gaudin et al. 2018 11.291 64.391 0.296 -2.421 -0.236 –
Loktin & Popova 2017 11.25 64.385 – 1.112 1.163 –
Kharchenko et al. 2016 11.257 64.379 – – – –
Dias et al. 2014 11.254 64.385 – -3.21 -1.3 –
Kharchenko et al. 2013 11.268 64.382 – -0.23 1.01 –
Kharchenko et al. 2012 11.268 64.382 – -0.23 0.47 –
Piskunov et al. 2008 11.351 64.394 – – – –
Piskunov et al. 2007 11.351 64.394 – – – –
Kharchenko et al. 2005 11.37 64.4 – -1.29 0.12 –
Kharchenko et al. 2003 11.35 64.4 – -2.31 -0.12 –
Dias et al. 2002 11.254 64.385 – -3.21 -1.3 –

💡 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
Li et al. 2025 1.15 0.29 – 7438 -0.161 – – –
Almeida et al. 2025 2.66 2.22 – 13 – 460 – –
Hunt & Reffert 2024 – – – – – 2171* – –
Celli et al. 2024 – – – 21 – 473 – –
Cavallo et al. 2024 3.63 2.29 – 10 0.350 – – –
Hunt & Reffert 2023 2.95 2.44 1.43 17 – – – –
Almeida et al. 2023 2.70 2.33 – 13 -0.134 645* 0.55 –
Just et al. 2023 – – – 20 – 1104 – –
Dias et al. 2021 2.66 2.22 – 13 -0.103 – – –
Cantat-Gaudin et al. 2020 3.12 2.16 – 21 – – – –
Cantat-Gaudin & Anders 2020 3.08 – – – – – – –
Dias et al. 2019 2.74 2.02 – 15 -1.112 – – –
Soubiran et al. 2018 3.08 – – – – – – –
Cantat-Gaudin et al. 2018 3.08 – – – – – – –
Loktin & Popova 2017 2.38 0.61 – 50 – – – –
Kharchenko et al. 2016 3.30 2.17 – 20 – – – –
Kharchenko et al. 2013 3.30 2.17 – 20 – – – –
Kharchenko et al. 2012 3.30 2.17 – 20 – – – –
Piskunov et al. 2008 3.20 2.17 – 12 – 5636* – –
Piskunov et al. 2007 3.20 2.17 – 12 – 653 – –
Kharchenko et al. 2005 3.20 2.17 – 12 – – – –
Kharchenko et al. 2003 1.25 1.86 – – – – – –
Dias et al. 2002 2.46 2.57 – 13 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 11734 26.4 11.33 64.37 0.32 -2.43 -0.37 – 0.12
OC 0229 13.6 11.28 64.39 0.3 -2.43 -0.34 – 0.0
OC 0230 11.4 11.28 64.38 0.32 -2.44 -0.36 – 0.0

💡 Note: The % column shows the percentage of members that Berkeley 4 shares with each listed object.

Visualization
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Berkeley 4 UCC
Berkeley 4 HUNT23
Berkeley 4 CANTAT20
Galactocentric position diagram