Berkeley 22

(MWSC 698; OCL 490)

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0.97 UTI
0.86
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 406
Core radius and density 1.2 [pc], 14 [pc-2]
C3 classification AA
  • CN 0.86 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very 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 22 is a rich, very dense object of very high C3 quality. Its parallax locates it at a 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 age and mass parameters (see Parameters). It is very well-studied in the literature.

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

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.12 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.12 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.3394, e_all=0.2086.

Rain et al. (2021)
The red limit of the straggler area is BP-RP=1.55.

Ahumada & Lapasset (2007)
The red limit of the blue straggler area is (B-V)=1.06. In (1994A&AS..108..151K) it is remarked that most of the straggler candidates are near the cluster centre; however, if the apparent diameter given in (1987, Lund Catalogue of Open Cluster Data), which is the one listed in Table 1, is taken as correct, the stragglers do not appear so central. It is possible that this diameter is still too small.

Data
🔍 Search references for Berkeley 22 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– 89.615 7.757 0.13 0.629 -0.404 90.907
Otto et al. 2026 89.615 7.759 – 0.65 -0.47 94.8
Guerco et al. 2025 89.6 7.76 0.15 0.61 -0.37 95.3
Hu & Soubiran 2025 89.617 7.753 – – – –
Hunt & Reffert 2024 89.615 7.759 0.134 0.564 -0.39 87.412
Cavallo et al. 2024 89.617 7.753 0.148 – – –
Hunt & Reffert 2023 89.615 7.759 0.134 0.564 -0.39 87.412
Just et al. 2023 89.624 7.758 – – – –
Jadhav & Subramaniam 2021 89.618 7.763 – – – –
Jaehnig et al. 2021 89.623 7.764 0.1 0.616 -0.456 –
Netopil et al. 2022 89.612 7.756 – – – 94.31
Rain et al. 2021 89.618 7.763 0.069 0.648 -0.473 –
Cantat-Gaudin et al. 2020 89.618 7.763 0.069 0.648 -0.473 –
Zhong et al. 2020 89.618 7.763 – 0.648 -0.473 97.289
Cantat-Gaudin & Anders 2020 89.618 7.763 0.069 0.648 -0.473 –
Soubiran et al. 2018 89.618 7.763 – – – 92.45
Bica et al. 2019 89.622 7.758 – – – –
Cantat-Gaudin et al. 2018 89.618 7.763 0.069 0.648 -0.473 –
Loktin & Popova 2017 89.61 7.757 – 0.395 -1.002 95.3
Kharchenko et al. 2016 89.624 7.758 – – – –
Netopil et al. 2016 89.6 7.833 – – – –
Kharchenko et al. 2013 89.631 7.757 – 1.81 -3.93 95.3
Gozha et al. 2012 89.613 7.757 – – – –
Bukowiecki et al. 2011 89.617 7.76 – – – –
Kharchenko et al. 2007 89.61 7.76 – 0.01 – –
Ahumada & Lapasset 2007 89.6 7.833 – – – –
van den Bergh 2006 89.6 7.833 – – – –
Chen et al. 2003 89.601 7.837 – – – –
Dias et al. 2002 89.612 7.757 – 1.81 -3.93 95.3
Lynga 1987 89.601 7.837 – – – –

💡 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– 6.57 1.97 2.54 2455 -0.305 1410 – 3
Otto et al. 2026 – – – 2455 -0.310(15) – – –
Guerco et al. 2025 – – – 2450 -0.330 – – –
Hu & Soubiran 2025 – – – – -0.300(5) – – –
Hunt & Reffert 2024 5.26 1.81 2.54 789 – 1410(1) – –
Cavallo et al. 2024 6.22 1.52 – 2884 -0.260 – – –
Hunt & Reffert 2023 5.26 1.81 2.54 789 – – – –
Just et al. 2023 – – – 3162 – 703 – –
Spina et al. 2022 – – – – -0.333 – – –
Jadhav & Subramaniam 2021 6.22 1.99 – 2455 – 2365 – 1(1)
Jaehnig et al. 2021 9.69(1) – – – – – – –
Netopil et al. 2022 6.92(1) – – 2512 -0.240(1) – – –
Rain et al. 2021 10.15 1.86 – 3311 – – – 3
Cantat-Gaudin et al. 2020 6.22 1.99 – 2455 – – – –
Kounkel et al. 2020 5.74 1.83 – 1995 – – – –
Zhong et al. 2020 10.15(1) – – – 0.000 – – –
Cantat-Gaudin & Anders 2020 10.15 – – – – – – –
Soubiran et al. 2018 10.15 – – – – – – –
Cantat-Gaudin et al. 2018 10.15 – – – – – – –
Loktin & Popova 2017 7.32 2.24 – 995 – – – –
Kharchenko et al. 2016 5.49 1.97 – 3162 – – – –
Netopil et al. 2016 13.87 – – 3070 -0.240(2) – – –
Heiter et al. 2014 – – – – -0.240 – – –
Kharchenko et al. 2013 5.49 1.97 – 3162 -0.320 – – –
Gozha et al. 2012 6.00 – – 3311 -0.320 – – –
Bukowiecki et al. 2011 6.18(1) 1.83 – 3162 – – – –
Paunzen et al. 2010 – – – – -0.420 – – –
Ahumada & Lapasset 2007 – 2.21 – 1072 – – – 21
van den Bergh 2006 7.66 2.21 – 1072 – – – –
Chen et al. 2003 7.66 2.21 – 1060 -0.300(1) – – –
Dias et al. 2002 6.00 1.86 – 3311 -0.320 – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
HSC 1586 6.2 89.61 7.76 0.25 0.67 -0.42 89.74 0.0

💡 Note: The % column shows the percentage of members that Berkeley 22 shares with each listed object.

Visualization
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Berkeley 22 UCC
Berkeley 22 HUNT23
Berkeley 22 CANTAT20
Galactocentric position diagram