Trumpler 22

(Collinder 283; VDBH 161; MWSC 2226; OCL 920; vdBergh-Hagen 161; ESO 134 06)

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0.92 UTI
0.79
CN
1.0
Cdens
1.0
CC3
0.9
Clit
1.0
Cdup
Nm (P>50%) 215
Core radius and density 2.5 [pc], 5.4 [pc-2]
C3 classification AA
  • CN 0.79 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.9 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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Trumpler 22 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near 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 age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Palma et al. (2025)
Classified as optical pair P482, along with HSC_2649.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.4495, e_all=0.058.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg45' along with Hogg 17, NGC 5617 and Pismis 19.

Morales et al. (2013)
Classified as morphological type 'OC2' (totally exposed cluster without correlation with ATLASGAL emission). Morphological flag: exposed cluster, without submm emission.

Data
🔍 Search references for Trumpler 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– 217.796 -61.165 0.402 -5.142 -2.687 -40.732
Li et al. 2025 217.783 -61.169 0.386 -5.12 -2.683 –
Almeida et al. 2025 217.794 -61.155 – – – –
Hunt & Reffert 2024 217.807 -61.182 0.41 -5.147 -2.688 -40.212
Cavallo et al. 2024 217.793 -61.17 0.41 – – –
Hunt & Reffert 2023 217.807 -61.182 0.41 -5.147 -2.688 -40.212
Just et al. 2023 217.72 -61.162 – – – –
Dias et al. 2021 217.794 -61.155 0.386 -5.136 -2.713 -43.17
Cantat-Gaudin et al. 2020 217.783 -61.169 0.386 -5.12 -2.683 –
Cantat-Gaudin & Anders 2020 217.783 -61.169 0.386 -5.12 -2.683 –
Bossini et al. 2019 217.783 -61.169 – – – –
Soubiran et al. 2018 217.783 -61.169 – – – -43.03
Bica et al. 2019 217.743 -61.169 – – – –
Cantat-Gaudin et al. 2018 217.783 -61.169 0.386 -5.12 -2.683 –
Dias et al. 2018 – – – -4.87 -2.77 –
Dib et al. 2018 217.732 -61.165 – – – –
Loktin & Popova 2017 217.755 -61.168 – -1.131 -4.299 -38.46
Sampedro et al. 2017 217.758 -61.167 – -4.51 -4.46 –
Joshi et al. 2016 217.732 -61.165 – – – –
Kharchenko et al. 2016 217.72 -61.162 – – – –
Dias et al. 2014 217.758 -61.167 – -4.63 -4.9 –
Kharchenko et al. 2013 217.732 -61.165 – -5.06 -4.2 –
Morales et al. 2013 217.758 -61.167 – – – –
Piskunov et al. 2008 217.743 -61.169 – – – –
van den Bergh 2006 217.75 -61.167 – – – –
Kharchenko et al. 2005 217.75 -61.17 – -5.05 -1.68 –
Kharchenko et al. 2003 217.78 -61.15 – -5.71 -3.39 –
Dias et al. 2002 217.758 -61.167 – -4.63 -4.9 -38.46
Lynga 1987 217.809 -61.167 – – – –
van den Bergh & Hagen 1975 216.85 -60.95 – – – –

💡 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– 1.75 1.67 0.77 95 -0.060 627 – –
Li et al. 2025 2.11 1.86 – 122 0.158 – – –
Almeida et al. 2025 2.21 1.90 – 65 – 1035 – –
Hunt & Reffert 2024 2.27 1.76 0.77 95 – 1830(1) – –
Cavallo et al. 2024 1.80 1.71 – 398 -0.060 – – –
Hunt & Reffert 2023 2.27 1.76 0.77 95 – – – –
Just et al. 2023 – – – 313 – 122 – –
Dias et al. 2021 2.21 1.90 – 65 0.275 – – –
Cantat-Gaudin et al. 2020 2.44 1.78 – 32 – – – –
Kounkel et al. 2020 2.28 2.44 – 63 – – – –
Cantat-Gaudin & Anders 2020 2.41 – – – – – – –
Bossini et al. 2019 2.36 1.83 – 24 -0.170 – – –
Soubiran et al. 2018 2.41 – – – – – – –
Cantat-Gaudin et al. 2018 2.41 – – – – – – –
Dib et al. 2018 1.61 – – 313 – – – –
Loktin & Popova 2017 1.53 1.62 – 95 – – – –
Joshi et al. 2016 1.61 1.58 – 313 – 219 – –
Kharchenko et al. 2016 1.61 1.58 – 313 – – – –
Kharchenko et al. 2013 1.61 1.58 – 313 – – – –
Morales et al. 2013 1.52 – – 89 – – – –
Piskunov et al. 2008 1.52 1.64 – 129 – – – –
van den Bergh 2006 1.52 1.64 – 89 – – – –
Kharchenko et al. 2005 1.52 1.64 – 129 – – – –
Kharchenko et al. 2003 1.52 1.64 – – – – – –
Dias et al. 2002 1.52 1.64 – 89 -0.170 – – –
Lynga 1987 1.70 1.67 – 110 – – – –

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

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