Berkeley 101

(FSR 0444; MWSC 3737; OCL 267)

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0.91 UTI
0.79
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 206
Radius (P>50% members) 2.3 [arcmin]
  • CN 0.79 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 101 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 massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is very well-studied in the literature.
Distant Moderate extinction Massive Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Berkeley 101 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 – 353.203 64.205 0.202 -1.86 -1.093 -70.417
Li et al. 2025 353.213 64.209 0.177 -1.899 -1.089 –
Hu & Soubiran 2025 353.21 64.203 – – – –
Almeida et al. 2025 353.215 64.21 – – – –
Hunt & Reffert 2024 353.207 64.206 0.199 -1.86 -1.09 -66.733
Cavallo et al. 2024 353.21 64.203 0.196 – – –
Hunt & Reffert 2023 353.207 64.206 0.199 -1.86 -1.09 -66.733
Just et al. 2023 353.181 64.202 – – – –
Dias et al. 2021 353.215 64.21 0.165 -1.869 -1.075 –
Cantat-Gaudin et al. 2020 353.213 64.209 0.177 -1.899 -1.089 –
Cantat-Gaudin & Anders 2020 353.213 64.209 0.177 -1.899 -1.089 –
Bica et al. 2019 353.195 64.196 – – – –
Cantat-Gaudin et al. 2018 353.213 64.209 0.177 -1.899 -1.089 –
Loktin & Popova 2017 353.19 64.208 – -2.05 -0.11 –
Kharchenko et al. 2016 353.181 64.202 – – – –
Dias et al. 2014 353.196 64.208 – -0.8 5.35 –
Kharchenko et al. 2013 353.188 64.205 – -2.33 -0.44 –
Kharchenko et al. 2012 353.188 64.205 – -2.05 -0.11 –
Froebrich et al. 2007 353.208 64.213 – – – –
Dias et al. 2002 353.196 64.208 – -2.05 -0.11 –

💡 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 4.76 2.96 – 579 0.449 – – –
Hu & Soubiran 2025 – – – – -0.410* – – –
Almeida et al. 2025 4.46 3.01 – 439 – 729 – –
Hunt & Reffert 2024 – – – – – 1893* – –
Cavallo et al. 2024 3.48 3.06 – 724 0.120 – – –
Hunt & Reffert 2023 4.48 3.33 1.42 217 – – – –
Just et al. 2023 – – – 724 – 1393 – –
Dias et al. 2021 4.46 3.01 – 439 -0.013 – – –
Cantat-Gaudin et al. 2020 4.27 2.84 – 380 – – – –
Cantat-Gaudin & Anders 2020 4.85 – – – – – – –
Cantat-Gaudin et al. 2018 4.85 – – – – – – –
Loktin & Popova 2017 2.84 2.63 – 575 – – – –
Kharchenko et al. 2016 3.00 2.94 – 724 – – – –
Kharchenko et al. 2013 3.00 2.94 – 724 – – – –
Kharchenko et al. 2012 3.00 2.94 – 724 – – – –
Dias et al. 2002 2.69 3.04 – 562 – – – –

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

Visualization
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Berkeley 101 UCC
Berkeley 101 HUNT23
Berkeley 101 CANTAT20
Galactocentric position diagram