Berkeley 33

(MWSC 1033)

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0.91 UTI
0.82
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 294
Radius (P>50% members) 2.4 [arcmin]
  • CN 0.82 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
ℹī¸
Berkeley 33 is a rich, very dense object of high C3 quality. Its parallax locates it at a large distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age 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.

Very distant Moderate extinction Massive Near-solar metallicity Intermediate age Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Berkeley 33 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 104.459 -13.227 0.17 -0.703 1.602 78.57
Li et al. 2025 104.456 -13.227 0.144 -0.73 1.551 –
Almeida et al. 2025 104.454 -13.226 – – – –
Hunt & Reffert 2024 104.462 -13.226 0.176 -0.688 1.594 84.489
Cavallo et al. 2024 104.461 -13.231 0.176 – – –
Hunt & Reffert 2023 104.462 -13.226 0.176 -0.688 1.594 84.489
Just et al. 2023 104.454 -13.219 – – – –
Jaehnig et al. 2021 104.459 -13.226 0.165 -0.731 1.577 –
Rain et al. 2021 104.456 -13.227 0.144 -0.73 1.551 –
Dias et al. 2021 104.454 -13.226 0.147 -0.741 1.575 78.836
Cantat-Gaudin et al. 2020 104.456 -13.227 0.144 -0.73 1.551 –
Donor et al. 2020 104.46 -13.22 – -0.69 1.56 77.5
Cantat-Gaudin & Anders 2020 104.456 -13.227 0.144 -0.73 1.551 –
Soubiran et al. 2018 104.456 -13.227 – – – 78.82
Cantat-Gaudin et al. 2018 104.456 -13.227 0.144 -0.73 1.551 –
Loktin & Popova 2017 104.46 -13.216 – -0.392 0.271 76.6
Kharchenko et al. 2016 104.454 -13.219 – – – –
Dias et al. 2014 104.425 -13.217 – -1.35 4.29 –
Kharchenko et al. 2013 104.46 -13.22 – 0.23 1.82 76.6
Gozha et al. 2012 104.425 -13.217 – – – –
van den Bergh 2006 104.425 -13.217 – – – –
Dias et al. 2002 104.425 -13.217 – -1.36 4.36 76.6

💡 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 4.82 1.81 – 745 -0.327 – – –
Almeida et al. 2025 4.38 2.06 – 305 – 1156 – –
Hunt & Reffert 2024 – – – – – 2028* – –
Cavallo et al. 2024 4.23 2.03 – 295 -0.160 – – –
Hunt & Reffert 2023 4.93 1.49 1.40 481 – – – –
Just et al. 2023 – – – 1096 – 497 – –
Jaehnig et al. 2021 5.81* – – – – – – –
Rain et al. 2021 5.79 1.12 – 794 – – – 1
Dias et al. 2021 4.38 2.06 – 305 -0.195 – – –
Cantat-Gaudin et al. 2020 5.86 1.75 – 234 – – – –
Donor et al. 2020 – – – – -0.300 – – –
Cantat-Gaudin & Anders 2020 5.79 – – – – – – –
Soubiran et al. 2018 5.79 – – – – – – –
Cantat-Gaudin et al. 2018 5.79 – – – – – – –
Loktin & Popova 2017 10.96 1.92 – 195 – – – –
Kharchenko et al. 2016 4.79 0.97 – 1096 – – – –
Kharchenko et al. 2013 4.79 0.97 – 1096 -0.260 – – –
Gozha et al. 2012 6.00 – – 794 -0.260 – – –
van den Bergh 2006 4.63 2.17 – 708 – – – –
Dias et al. 2002 6.00 1.12 – 794 -0.260 – – –

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

Visualization
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Berkeley 33 UCC
Berkeley 33 HUNT23
Berkeley 33 CANTAT20
Galactocentric position diagram