Trumpler 33

(Collinder 378; MWSC 2910; OCL 34; ESO 590 20; FoF 2212)

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0.95 UTI
0.77
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 141
Radius (P>50% members) 6.6 [arcmin]
  • CN 0.77 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 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Trumpler 33 is a rich, very dense object of very 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, young cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is very well-studied in the literature.
Relatively close Moderate extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Trumpler 33 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 – 276.151 -19.715 0.688 0.492 0.511 -4.359
Li et al. 2025 276.159 -19.711 0.677 0.435 0.449 –
Almeida et al. 2025 276.164 -19.712 – – – –
Hunt & Reffert 2024 276.158 -19.709 0.682 0.52 0.502 -3.987
Cavallo et al. 2024 276.142 -19.743 0.687 – – –
Hunt & Reffert 2023 276.158 -19.709 0.682 0.52 0.502 -3.987
Almeida et al. 2023 276.169 -19.72 – – – –
Just et al. 2023 276.164 -19.721 – – – –
Tarricq et al. 2022 276.151 -19.726 0.699 0.536 0.528 –
Dias et al. 2021 276.164 -19.712 0.682 0.423 0.447 –
Cantat-Gaudin et al. 2020 276.159 -19.711 0.677 0.435 0.449 –
Cantat-Gaudin & Anders 2020 276.159 -19.711 0.677 0.435 0.449 –
Liu & Pang 2019 276.151 -19.716 0.688 0.509 0.526 –
Dias et al. 2019 276.175 -19.717 0.699 0.458 0.511 -4.64
Soubiran et al. 2018 276.159 -19.711 – – – -3.71
Bica et al. 2019 276.164 -19.719 – – – –
Cantat-Gaudin et al. 2018 276.159 -19.711 0.677 0.435 0.449 –
Loktin & Popova 2017 276.18 -19.718 – 2.656 -6.093 -3.8
Kharchenko et al. 2016 276.164 -19.721 – – – –
Dias et al. 2014 276.175 -19.717 – -0.43 -1.55 -16.2
Kharchenko et al. 2013 276.172 -19.72 – -3.0 -1.85 -3.8
Gozha et al. 2012 276.175 -19.717 – – – –
Piskunov et al. 2008 276.173 -19.724 – – – –
van den Bergh 2006 276.175 -19.717 – – – –
Kharchenko et al. 2005 276.18 -19.72 – -4.69 -0.92 –
Dias et al. 2002 276.175 -19.717 – -0.43 -1.55 -16.2

💡 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 1.33 1.44 – 72 -0.041 – – –
Almeida et al. 2025 1.41 1.50 – 49 – 126 – –
Hunt & Reffert 2024 – – – – – 925* – –
Cavallo et al. 2024 1.18 1.56 – 95 -0.290 – – –
Hunt & Reffert 2023 1.36 1.41 1.29 52 – – – –
Almeida et al. 2023 1.33 1.49 – 69 0.061 313* 0.56 –
Just et al. 2023 – – – 69 – 36 – –
Tarricq et al. 2022 1.39 – – 65 – – – –
Dias et al. 2021 1.41 1.50 – 49 0.145 – – –
Cantat-Gaudin et al. 2020 1.45 1.22 – 58 – – – –
Cantat-Gaudin & Anders 2020 1.42 – – – – – – –
Liu & Pang 2019 – – – 29 0.250 – – –
Dias et al. 2019 1.49 1.30 – 27 -0.013 – – –
Soubiran et al. 2018 1.42 – – – – – – –
Cantat-Gaudin et al. 2018 1.42 – – – – – – –
Loktin & Popova 2017 1.80 1.17 – 43 – – – –
Kharchenko et al. 2016 1.28 1.55 – 69 – – – –
Kharchenko et al. 2013 1.28 1.55 – 69 -1.544 – – –
Gozha et al. 2012 1.75 – – 48 – 107 – –
Piskunov et al. 2008 1.75 1.12 – 69 – – – –
van den Bergh 2006 1.75 1.12 – 48 – – – –
Kharchenko et al. 2005 1.75 1.12 – 69 – – – –
Dias et al. 2002 1.75 1.11 – 48 -1.544 – – –

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

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