Trumpler 2

(Collinder 29; MWSC 219; OCL 365; FoF 2297)

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0.96 UTI
0.8
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 245
Radius (P>50% members) 15.3 [arcmin]
  • CN 0.8 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
ℹī¸
Trumpler 2 is a rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low 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.
Close Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Trumpler 2 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 39.247 55.927 1.445 1.531 -5.406 -7.248
Li et al. 2025 39.232 55.905 1.431 1.583 -5.352 –
Wei et al. 2025 39.281 55.886 1.454 1.524 -5.406 –
Almeida et al. 2025 39.239 55.894 – – – –
Alfonso et al. 2024 38.967 55.958 1.397 1.462 -5.223 –
Zhang et al. 2024 39.305 55.926 – – – –
Hunt & Reffert 2024 39.305 55.926 1.455 1.54 -5.411 -8.322
Cavallo et al. 2024 38.956 55.889 1.448 – – –
Hunt & Reffert 2023 39.305 55.926 1.455 1.54 -5.411 -8.322
Almeida et al. 2023 39.267 55.895 – – – –
Just et al. 2023 39.356 55.948 – – – –
He et al. 2022 39.34 55.914 1.449 1.525 -5.381 –
Tarricq et al. 2022 39.217 55.927 1.434 1.553 -5.375 –
Jaehnig et al. 2021 39.255 55.934 1.456 1.56 -5.302 –
Rain et al. 2021 39.232 55.905 1.431 1.583 -5.352 –
Dias et al. 2021 39.239 55.894 1.435 1.581 -5.343 -3.99
Cantat-Gaudin et al. 2020 39.232 55.905 1.431 1.583 -5.352 –
Cantat-Gaudin & Anders 2020 39.232 55.905 1.431 1.583 -5.352 –
Liu & Pang 2019 39.222 55.966 1.441 1.574 -5.323 –
Bossini et al. 2019 39.232 55.905 – – – –
Soubiran et al. 2018 39.232 55.905 – – – -4.12
Bica et al. 2019 39.281 55.934 – – – –
Cantat-Gaudin et al. 2018 39.232 55.905 1.431 1.583 -5.352 –
Loktin & Popova 2017 39.225 55.915 – 1.375 -1.757 -27.5
Kharchenko et al. 2016 39.356 55.948 – – – –
Dias et al. 2014 39.221 55.915 – 0.11 -3.49 –
Kharchenko et al. 2013 39.367 55.95 – 0.78 -4.0 -27.5
Gozha et al. 2012 39.221 55.915 – – – –
Kharchenko et al. 2012 39.367 55.95 – 0.69 -4.07 -27.5
Piskunov et al. 2008 39.211 55.919 – – – –
Kharchenko et al. 2007 39.22 55.92 – 0.5 – -27.5
Piskunov et al. 2007 39.211 55.919 – – – –
van den Bergh 2006 39.225 55.917 – – – –
Kharchenko et al. 2005 39.22 55.92 – 1.4 -5.57 -39.0
Kharchenko et al. 2003 39.22 55.92 – 0.72 -5.6 –
Chen et al. 2003 39.31 55.971 – 1.36 -5.13 2.4
Dias et al. 2002 39.221 55.915 – 0.11 -3.49 2.4

💡 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 0.66 0.85 – 342 0.052 – – –
Wei et al. 2025 1.08 1.36 – 68 0.000 726 0.35 –
Almeida et al. 2025 0.68 1.10 – 238 – 423 – –
Alfonso et al. 2024 0.71 0.86 – 177 0.139 – – –
Zhang et al. 2024 – – – – -0.144* – – –
Hunt & Reffert 2024 – – – – – 702* – –
Cavallo et al. 2024 0.72 1.20 – 66 0.400 – – –
Hunt & Reffert 2023 0.65 0.86 1.10 90 – – – –
Almeida et al. 2023 0.67 1.19 – 106 -0.042 498* 0.47 –
Just et al. 2023 – – – 84 – 110 – –
He et al. 2022 – 1.20 – 79 – – – –
Tarricq et al. 2022 0.70 – – 112 – – – –
Jaehnig et al. 2021 0.69* – – – – – – –
Rain et al. 2021 0.68 0.93 – 91 – – – 0
Dias et al. 2021 0.68 1.10 – 238 0.140 – – –
Cantat-Gaudin et al. 2020 0.71 0.86 – 112 – – – –
Cantat-Gaudin & Anders 2020 0.68 – – – – – – –
Liu & Pang 2019 – – – 81 0.250 – – –
Bossini et al. 2019 0.74 0.95 – 92 0.000 – – –
Soubiran et al. 2018 0.68 – – – – – – –
Cantat-Gaudin et al. 2018 0.68 – – – – – – –
Loktin & Popova 2017 0.66 1.02 – 136 – – – –
Kharchenko et al. 2016 0.67 1.00 – 84 – – – –
Kharchenko et al. 2013 0.67 1.00 – 84 – – – –
Gozha et al. 2012 0.72 – – 89 – 427 – –
Kharchenko et al. 2012 0.67 1.00 – 84 – – – –
Piskunov et al. 2008 0.65 0.99 – 85 – 160* – –
Piskunov et al. 2007 0.65 0.99 – 85 – 61 – –
van den Bergh 2006 0.65 0.99 – 148 – – – –
Kharchenko et al. 2005 0.65 0.99 – 85 – – – –
Kharchenko et al. 2003 0.65 0.99 – – – – – –
Chen et al. 2003 0.65 – – 140 -0.450* – – –
Dias et al. 2002 0.72 1.24 – 89 – – – –

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

Visualization
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Trumpler 2 UCC
Trumpler 2 HUNT23
Trumpler 2 CANTAT20
Galactocentric position diagram