Berkeley 73

(MWSC 847; OCL 546)

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0.75 UTI
0.76
CN
0.71
Cdens
0.75
CC3
0.77
Clit
1.0
Cdup
Nm (P>50%) 133
Core radius and density 1.8 [pc], 3.6 [pc-2]
C3 classification AB
  • CN 0.76 Rich
  • Cdens 0.71 Moderately dense
  • CC3 0.75 High quality
  • Clit 0.77 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Berkeley 73 is a rich, moderately 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 well-studied in the literature.

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

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Perren et al. (2022)
The CMD shows a main sequence and a well-defined TO followed by a giant branch that is somewhat redder than expected. Some stars above the TO are BSS candidates; no clear RC. ASteCA estimates a distance of 5.5 kpc and an age of 4 Gyr, which is closer and older than any of the four databases or prior studies (Ortolani 2005: 2.3 Gyr/6.5 kpc; Carraro 2005 and 2007: 1.5 Gyr/9.7–11.5 kpc). The closest match is Dias 2021 (5.8 kpc, 2.2 Gyr). This places the cluster well inside the 9 kpc limit.

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2701, e_all=0.4099.

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 99999– 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 – – – –
Jadhav & Subramaniam 2021 95.52 -6.321 – – – –
Netopil et al. 2022 95.5 -6.35 – – – 97.51
Dias et al. 2021 95.516 -6.328 0.12 0.2 1.065 –
Spina et al. 2021 95.52 -6.322 0.138 0.251 1.087 –
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 – – – –
Netopil et al. 2016 95.525 -6.317 – – – –
Kharchenko et al. 2013 95.515 -6.319 – 3.47 -1.72 95.7
Gozha et al. 2012 95.5 -6.35 – – – –
Bukowiecki et al. 2011 95.525 -6.323 – – – –
Dias et al. 2002 95.5 -6.35 – 3.47 -1.72 95.7
Lynga 1987 95.513 -6.346 – – – –

💡 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] Bfrac BSS
UCC 99999– 6.35 0.675 1.38 1513 -0.310 810 0.53 0
Li et al. 2025 6.45 1.20 – 1513 -0.371 – – –
Hu & Soubiran 2025 – – – – -0.400(5) – – –
Almeida et al. 2025 5.83 0.86 – 2223 – 524 – –
Hunt & Reffert 2024 6.82 0.61 1.38 1343 – 972(1) – –
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 –
Spina et al. 2022 – – – – -0.310 – – –
Jadhav & Subramaniam 2021 6.17 0.69 – 1413 – 810 – 0(1)
Netopil et al. 2022 7.24(1) – – 1585 -0.230(1) – – –
Dias et al. 2021 5.83 0.86 – 2223 -0.226 – – –
Spina et al. 2021 4.33 – – 1413 -0.319(20) – – –
Cantat-Gaudin et al. 2020 6.17 0.69 – 1413 – – – –
Kounkel et al. 2020 5.10 0.89 – 1380 – – – –
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 0.66 – 1413 – – – –
Netopil et al. 2016 15.81 – – 1710 – – – –
Kharchenko et al. 2013 7.88 0.66 – 1413 -0.220 – – –
Gozha et al. 2012 9.80 – – 1514 -0.220 – – –
Bukowiecki et al. 2011 9.36(1) 0.22 – 1778 – – – –
Dias et al. 2002 9.80 0.35 – 1514 -0.220 – – –

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

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