Berkeley 73

(MWSC 847; OCL 546)

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0.90 UTI
0.76
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 133
Radius (P>50% members) 1.4 [arcmin]
  • CN 0.76 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 73 is a rich, very dense object of high C3 quality. Its parallax locates it at a large* distance, well below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is very well-studied in the literature.

(*): The parallax distance estimate (~9.26 kpc) differs significantly from the median photometric distance (~6.35 kpc).

Very distant Low extinction Near-solar metallicity Old

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Berkeley 73 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 – 95.52 -6.318 0.108 0.212 1.076 96.515
Li et al. 2025 95.52 -6.321 0.128 0.227 1.11 –
Hu & Soubiran 2025 95.517 -6.306 – – – –
Almeida et al. 2025 95.516 -6.328 – – – –
Hunt & Reffert 2024 95.52 -6.319 0.122 0.214 1.012 94.289
Cavallo et al. 2024 95.517 -6.307 0.115 – – –
Hunt & Reffert 2023 95.52 -6.319 0.122 0.214 1.012 94.289
Just et al. 2023 95.509 -6.318 – – – –
Perren et al. 2022 95.52 -6.321 – – – –
Dias et al. 2021 95.516 -6.328 0.12 0.2 1.065 –
Cantat-Gaudin et al. 2020 95.52 -6.321 0.128 0.227 1.11 –
Cantat-Gaudin & Anders 2020 95.52 -6.321 0.128 0.227 1.11 –
Soubiran et al. 2018 95.52 -6.321 – – – 96.97
Bica et al. 2019 95.522 -6.319 – – – –
Cantat-Gaudin et al. 2018 95.52 -6.321 0.128 0.227 1.11 –
Kharchenko et al. 2016 95.509 -6.318 – – – –
Kharchenko et al. 2013 95.515 -6.319 – 3.47 -1.72 95.7
Gozha et al. 2012 95.5 -6.35 – – – –
Dias et al. 2002 95.5 -6.35 – 3.47 -1.72 95.7

💡 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 6.45 1.20 – 1513 -0.371 – – –
Hu & Soubiran 2025 – – – – -0.400* – – –
Almeida et al. 2025 5.83 0.86 – 2223 – 524 – –
Hunt & Reffert 2024 – – – – – 972* – –
Cavallo et al. 2024 4.85 1.06 – 2512 -0.510 – – –
Hunt & Reffert 2023 6.82 0.61 1.38 1343 – – – –
Just et al. 2023 – – – 1413 – 612 – –
Perren et al. 2022 5.50 0.50 – 3981 -0.410 3300 0.53 –
Dias et al. 2021 5.83 0.86 – 2223 -0.226 – – –
Cantat-Gaudin et al. 2020 6.17 0.69 – 1413 – – – –
Cantat-Gaudin & Anders 2020 6.35 – – – – – – –
Soubiran et al. 2018 6.35 – – – – – – –
Cantat-Gaudin et al. 2018 6.35 – – – – – – –
Kharchenko et al. 2016 7.88 0.64 – 1413 – – – –
Kharchenko et al. 2013 7.88 0.64 – 1413 -0.220 – – –
Gozha et al. 2012 9.80 – – 1514 -0.220 – – –
Dias et al. 2002 9.80 0.34 – 1514 -0.220 – – –

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

Visualization
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Berkeley 73 UCC
Berkeley 73 HUNT23
Berkeley 73 CANTAT20
Galactocentric position diagram