Trumpler 32

(Collinder 372; MWSC 2873; Harvard 19; OCL 55)

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0.92 UTI
1.0
CN
1.0
Cdens
1.0
CC3
0.81
Clit
1.0
Cdup
Nm (P>50%) 1002
Core radius and density 1.1 [pc], 36 [pc-2]
C3 classification AA
  • CN 1.0 Very rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.81 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Trumpler 32 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, above 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 metallicity and mass parameters (see Parameters). It is well-studied in the literature.

Palma et al. (2025)
Classified as optical pair P557, along with OC_0030.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.87 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.87 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1523, e_all=0.1734.

Morales et al. (2013)
Classified as morphological type 'OC1' (totally exposed cluster still physically associated with gas). Morphological flag: exposed cluster, without submm emission.

Data
🔍 Search references for Trumpler 32 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 274.294 -13.349 0.578 -1.028 1.161 16.012
Li et al. 2025 274.294 -13.349 0.578 -1.052 1.158 –
Hu & Soubiran 2025 274.301 -13.343 – – – –
Almeida et al. 2025 274.301 -13.351 – – – –
Hunt & Reffert 2024 274.292 -13.356 0.579 -1.039 1.16 18.996
Cavallo et al. 2024 274.302 -13.343 0.579 – – –
Hunt & Reffert 2023 274.292 -13.356 0.579 -1.039 1.16 18.996
Almeida et al. 2023 274.298 -13.332 – – – –
Just et al. 2023 274.29 -13.331 – – – –
Jadhav & Subramaniam 2021 274.294 -13.349 – – – –
Dias et al. 2021 274.301 -13.351 0.578 -1.052 1.152 17.222
Cantat-Gaudin et al. 2020 274.294 -13.349 0.578 -1.052 1.158 –
Cantat-Gaudin & Anders 2020 274.294 -13.349 0.578 -1.052 1.158 –
Soubiran et al. 2018 274.294 -13.349 – – – 16.52
Bica et al. 2019 274.296 -13.362 – – – –
Cantat-Gaudin et al. 2018 274.294 -13.349 0.578 -1.052 1.158 –
Dib et al. 2018 274.297 -13.33 – – – –
Loktin & Popova 2017 274.335 -13.346 – -0.809 -4.314 –
Sampedro et al. 2017 274.375 -13.35 – -1.79 0.5 –
Joshi et al. 2016 274.297 -13.33 – – – –
Kharchenko et al. 2016 274.29 -13.331 – – – –
Dias et al. 2014 274.375 -13.35 – -0.91 -0.34 –
Kharchenko et al. 2013 274.297 -13.33 – 0.64 -3.6 –
Morales et al. 2013 274.375 -13.35 – – – –
van den Bergh 2006 274.375 -13.35 – – – –
Dias et al. 2002 274.375 -13.35 – -0.91 -0.34 –
Lynga 1987 274.407 -13.351 – – – –

💡 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– 1.62 2.43 2.07 647 -0.008 1422 0.62 0
Li et al. 2025 1.76 2.53 – 754 0.150 – – –
Hu & Soubiran 2025 – – – – -0.160(5) – – –
Almeida et al. 2025 1.56 2.48 – 647 – 975 – –
Hunt & Reffert 2024 1.61 2.18 2.07 764 – 4914(1) – –
Cavallo et al. 2024 1.40 2.64 – 813 -0.290 – – –
Hunt & Reffert 2023 1.61 2.18 2.07 764 – – – –
Almeida et al. 2023 1.60 2.43 – 748 0.079 1422(1) 0.62 –
Just et al. 2023 – – – 624 – 1750 – –
Jadhav & Subramaniam 2021 1.61 1.32 – 1349 – 891 – 0(1)
Dias et al. 2021 1.56 2.48 – 647 -0.008 – – –
Cantat-Gaudin et al. 2020 1.61 1.32 – 1349 – – – –
Kounkel et al. 2020 1.73 2.49 – 794 – – – –
Cantat-Gaudin & Anders 2020 1.65 – – – – – – –
Soubiran et al. 2018 1.65 – – – – – – –
Cantat-Gaudin et al. 2018 1.65 – – – – – – –
Dib et al. 2018 1.62 – – 624 – – – –
Loktin & Popova 2017 1.94 2.99 – 457 – – – –
Joshi et al. 2016 1.62 2.43 – 624 – – – –
Kharchenko et al. 2016 1.62 2.43 – 624 – – – –
Kharchenko et al. 2013 1.62 2.43 – 624 – – – –
Morales et al. 2013 1.72 – – 300 – – – –
van den Bergh 2006 1.72 2.02 – 302 – – – –
Dias et al. 2002 1.72 2.02 – 302 – – – –

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

Visualization
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Trumpler 32 UCC
Trumpler 32 HUNT23
Trumpler 32 CANTAT20
Galactocentric position diagram