Berkeley 9

(MWSC 286; OCL 388; FSR 0646; FoF 722)

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0.91 UTI
0.8
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 237
Core radius and density 0.7 [pc], 28 [pc-2]
C3 classification AB
  • CN 0.8 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Berkeley 9 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by moderate 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.

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

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).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1032, e_all=0.1659.

Data
πŸ” Search references for Berkeley 9 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 53.164 52.651 0.555 1.494 -0.005 -17.034
Otto et al. 2026 53.174 52.652 – 1.49 0.04 -18.0
Li et al. 2025 53.167 52.649 0.513 1.493 0.037 –
Hu & Soubiran 2025 53.166 52.651 – – – –
Almeida et al. 2025 53.163 52.651 – – – –
Zhang et al. 2024 53.174 52.652 – – – –
Hunt & Reffert 2024 53.174 52.652 0.547 1.484 -0.024 -15.467
Cavallo et al. 2024 53.166 52.651 0.555 – – –
Hunt & Reffert 2023 53.174 52.652 0.547 1.484 -0.024 -15.467
Just et al. 2023 53.152 52.649 – – – –
Jadhav & Subramaniam 2021 53.167 52.649 – – – –
Netopil et al. 2022 53.166 52.649 – – – -18.14
Dias et al. 2021 53.163 52.651 0.505 1.508 0.06 -17.248
Spina et al. 2021 53.167 52.65 0.506 1.531 0.03 –
Cantat-Gaudin et al. 2020 53.167 52.649 0.513 1.493 0.037 –
SΓ‘nchez et al. 2020 53.163 52.654 – 1.409 -0.101 –
Donor et al. 2020 53.163 52.65 – 1.57 -0.1 -16.9
Cantat-Gaudin & Anders 2020 53.167 52.649 0.513 1.493 0.037 –
Liu & Pang 2019 53.178 52.64 0.518 1.516 0.02 –
Soubiran et al. 2018 53.167 52.649 – – – -17.4
Bica et al. 2019 53.162 52.645 – – – –
Cantat-Gaudin et al. 2018 53.167 52.649 0.513 1.493 0.037 –
Dias et al. 2018 – – – 0.72 0.2 –
Dib et al. 2018 53.163 52.65 – – – –
Loktin & Popova 2017 53.16 52.654 – -2.826 -1.962 –
Sampedro et al. 2017 53.163 52.654 – 1.04 -0.45 –
Joshi et al. 2016 53.163 52.65 – – – –
Kharchenko et al. 2016 53.152 52.649 – – – –
Dias et al. 2014 53.163 52.654 – 1.07 -0.57 –
Kharchenko et al. 2013 53.163 52.65 – -2.39 -2.43 –
Kharchenko et al. 2012 53.163 52.65 – -2.39 -2.43 –
Bukowiecki et al. 2011 53.154 52.657 – – – –
Dias et al. 2002 53.163 52.654 – 1.07 -0.57 –
Lynga 1987 53.189 52.719 – – – –

πŸ’‘ 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– 1.695 2.635 1.025 1713 -0.078 626 – 0
Otto et al. 2026 – – – 1380 -0.080(15) – – –
Li et al. 2025 1.51 2.77 – 2455 -0.078 – – –
Hu & Soubiran 2025 – – – – 0.040(5) – – –
Almeida et al. 2025 1.79 3.01 – 1521 – 626 – –
Zhang et al. 2024 – – – – 0.005(1) – – –
Hunt & Reffert 2024 1.68 3.04 1.03 859 – 1176(1) – –
Cavallo et al. 2024 1.71 3.06 – 1514 0.040 – – –
Hunt & Reffert 2023 1.68 3.04 1.02 859 – – – –
Just et al. 2023 – – – 1995 – 53 – –
Spina et al. 2022 – – – – -0.090 – – –
Jadhav & Subramaniam 2021 1.81 2.69 – 1380 – 1709 – 0(1)
Netopil et al. 2022 1.81(1) – – 1380 -0.090(1) – – –
Dias et al. 2021 1.79 3.01 – 1521 -0.186 – – –
Spina et al. 2021 1.99 – – 1380 -0.077(20) – – –
Cantat-Gaudin et al. 2020 1.81 2.69 – 1380 – – – –
Kounkel et al. 2020 1.75 2.58 – 1905 – – – –
Donor et al. 2020 – – – – -0.090 – – –
Cantat-Gaudin & Anders 2020 1.85 – – – – – – –
Liu & Pang 2019 – – – 3090 0.000 – – –
Soubiran et al. 2018 1.85 – – – – – – –
Cantat-Gaudin et al. 2018 1.85 – – – – – – –
Dib et al. 2018 1.55 – – 1995 – – – –
Loktin & Popova 2017 1.29 2.42 – 1445 – – – –
Joshi et al. 2016 1.55 2.37 – 1995 – – – –
Kharchenko et al. 2016 1.55 2.37 – 1995 – – – –
Kharchenko et al. 2013 1.55 2.37 – 1995 – – – –
Bukowiecki et al. 2012 – – – – – 490 – –
Kharchenko et al. 2012 1.55 2.37 – 1995 – – – –
Bukowiecki et al. 2011 1.40(1) 1.83 – 2512 – – – –
Dias et al. 2002 1.48 2.49 – 1995 – – – –

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

Visualization
ℹ️
Berkeley 9 UCC
Berkeley 9 HUNT23
Berkeley 9 CANTAT20
Galactocentric position diagram