Berkeley 75

(MWSC 993; OCL 614; ES0490SC50)

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0.84 UTI
0.77
CN
0.81
Cdens
1.0
CC3
0.8
Clit
1.0
Cdup
Nm (P>50%) 165
Core radius and density 1.6 [pc], 4.1 [pc-2]
C3 classification AA
  • CN 0.77 Rich
  • Cdens 0.81 Dense
  • CC3 1.0 Very high quality
  • Clit 0.8 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 75 is a rich, dense object of very 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 massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is well-studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.65 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.65 (50th percentile).

Perren et al. (2022)
A sparse cluster with fewer than 100 detected members. Carraro 2005 report a TO at V=17.5, a radius of 1', an age of 3.5 Gyr, and a distance of 9.8 kpc. Our structural analysis gives a 2' radius with the TO at G=17.7 mag. The giant branch is poorly populated but shows a two-star RC, and some stars above the sub-giant branch are likely binaries. ASteCA places Berkeley 75 at 8 kpc with an age of 5.5 Gyr. The distance is similar to CG20 (8.3 kpc), although CG20 assigns a much younger age of 1.7 Gyr. OC02 gives a closer age (4 Gyr) but a larger distance by ~1 kpc.

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0164, e_all=0.3094.

Data
🔍 Search references for Berkeley 75 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– 102.251 -23.996 0.104 -0.232 1.147 125.075
Otto et al. 2026 102.249 -23.996 – -0.26 1.09 124.8
Hunt & Reffert 2024 102.249 -23.996 0.108 -0.241 1.179 125.07
Cavallo et al. 2024 102.268 -24.015 0.104 – – –
Hunt & Reffert 2023 102.249 -23.996 0.108 -0.241 1.179 125.07
Just et al. 2023 102.258 -23.983 – – – –
Perren et al. 2022 102.252 -23.999 – – – –
Jadhav & Subramaniam 2021 102.252 -23.999 – – – –
Cantat-Gaudin et al. 2020 102.252 -23.999 0.088 -0.264 1.088 –
Cantat-Gaudin & Anders 2020 102.252 -23.999 0.088 -0.264 1.088 –
Soubiran et al. 2018 102.252 -23.999 – – – 126.82
Bica et al. 2019 102.259 -23.987 – – – –
Cantat-Gaudin et al. 2018 102.252 -23.999 0.088 -0.264 1.088 –
Dias et al. 2018 – – – -1.3 2.21 –
Loktin & Popova 2017 102.255 -23.996 – 0.418 1.254 94.6
Sampedro et al. 2017 102.254 -23.997 – 0.84 2.66 –
Kharchenko et al. 2016 102.258 -23.983 – – – –
Netopil et al. 2016 102.254 -23.997 – – – –
Kharchenko et al. 2013 102.264 -23.985 – 0.51 5.35 94.6
Gozha et al. 2012 102.254 -23.997 – – – –
Bukowiecki et al. 2011 102.263 -23.985 – – – –
Dias et al. 2002 102.254 -23.997 – -4.56 -9.82 94.6
Lynga 1987 102.319 -23.962 – – – –

💡 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– 8.32 0.245 1.08 1995 -0.390 1752 0.77 3
Otto et al. 2026 – – – 1698 -0.410(15) – – –
Hunt & Reffert 2024 7.44 0.20 1.08 1858 – 583(1) – –
Cavallo et al. 2024 4.37 0.80 – 11482 -1.000 – – –
Hunt & Reffert 2023 7.44 0.20 1.08 1858 – – – –
Just et al. 2023 – – – 1995 – 2600 – –
Perren et al. 2022 8.02 0.35 – 5495 -0.390 6800 0.77 –
Spina et al. 2022 – – – – -0.412 – – –
Jadhav & Subramaniam 2021 8.32 0.29 – 1698 – 903 – 3(1)
Cantat-Gaudin et al. 2020 8.32 0.29 – 1698 – – – –
Kounkel et al. 2020 6.97 0.46 – 1445 – – – –
Cantat-Gaudin & Anders 2020 8.51 – – – – – – –
Soubiran et al. 2018 8.51 – – – – – – –
Cantat-Gaudin et al. 2018 8.51 – – – – – – –
Loktin & Popova 2017 3.52 0.96 – 1738 – – – –
Kharchenko et al. 2016 6.27 0.13 – 1995 – – – –
Netopil et al. 2016 14.59 – – 2790 – – – –
Kharchenko et al. 2013 6.27 0.13 – 1995 -0.220 – – –
Gozha et al. 2012 9.10 – – 3981 -0.220 – – –
Bukowiecki et al. 2011 9.08(1) 0.00 – 1995 – – – –
Dias et al. 2002 9.10 0.13 – 3981 -0.220 – – –

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

Visualization
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Berkeley 75 UCC
Berkeley 75 HUNT23
Berkeley 75 CANTAT20
Galactocentric position diagram