Berkeley 102

(MWSC 3750; OCL 263)

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0.91 UTI
0.78
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 181
Radius (P>50% members) 1.5 [arcmin]
  • CN 0.78 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 102 is a rich, very dense object of high C3 quality. Its parallax locates it at a very large* distance, well below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.

(*): The parallax distance estimate (~11.35 kpc) differs significantly from the median photometric distance (~8.56 kpc).

Very distant Moderate extinction Massive Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Berkeley 102 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 – 354.663 56.639 0.088 -1.534 -0.366 -126.974
Li et al. 2025 354.66 56.637 0.05 -1.559 -0.34 –
Hu & Soubiran 2025 354.639 56.63 – – – –
Hunt & Reffert 2024 354.671 56.64 0.101 -1.549 -0.342 -85.772
Cavallo et al. 2024 354.639 56.63 0.095 – – –
Hunt & Reffert 2023 354.671 56.64 0.101 -1.549 -0.342 -85.772
Just et al. 2023 354.707 56.622 – – – –
Perren et al. 2022 354.66 56.637 – – – –
Cantat-Gaudin et al. 2020 354.66 56.637 0.05 -1.559 -0.34 –
Cantat-Gaudin & Anders 2020 354.66 56.637 0.05 -1.559 -0.34 –
Bica et al. 2019 354.664 56.643 – – – –
Cantat-Gaudin et al. 2018 354.66 56.637 0.05 -1.559 -0.34 –
Loktin & Popova 2017 354.675 56.633 – -1.63 -0.44 –
Kharchenko et al. 2016 354.707 56.622 – – – –
Kharchenko et al. 2013 354.715 56.626 – -3.89 -1.87 –
Gozha et al. 2012 354.675 56.633 – – – –
Kharchenko et al. 2012 354.715 56.626 – -3.89 -1.87 –
Dias et al. 2002 354.675 56.633 – -1.63 -0.44 –

💡 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 8.57 1.44 – 2402 0.049 – – –
Hu & Soubiran 2025 – – – – -0.320* – – –
Hunt & Reffert 2024 – – – – – 1110* – –
Cavallo et al. 2024 7.83 1.21 – 3631 0.040 – – –
Hunt & Reffert 2023 8.56 1.78 1.62 1413 – – – –
Just et al. 2023 – – – 1380 – 692 – –
Perren et al. 2022 7.35 1.40 – 4898 -0.170 5800 0.55 –
Cantat-Gaudin et al. 2020 10.52 1.11 – 3890 – – – –
Cantat-Gaudin & Anders 2020 12.61 – – – – – – –
Cantat-Gaudin et al. 2018 12.61 – – – – – – –
Loktin & Popova 2017 1.75 1.91 – 5012 – – – –
Kharchenko et al. 2016 4.90 1.86 – 1380 – – – –
Kharchenko et al. 2013 4.90 1.86 – 1380 -0.380 – – –
Gozha et al. 2012 9.64 – – 3162 -0.380 – – –
Kharchenko et al. 2012 4.90 1.86 – 1380 -0.380 – – –
Dias et al. 2002 9.64 1.27 – 3162 -0.380 – – –

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

Visualization
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Berkeley 102 UCC
Berkeley 102 HUNT23
Berkeley 102 CANTAT20
Galactocentric position diagram