Trumpler 30

(Collinder 355; MWSC 2755; Harvard 18; OCL 1025; ESO 394 12)

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0.96 UTI
0.79
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 205
Stellar density (N50/rad) 30.9 [N/pc2]
C3 classification AA
  • CN 0.79 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 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Trumpler 30 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 low extinction. It is catalogued as a near-solar metallicity, intermediate-age 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.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Trumpler 30 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– 269.174 -35.304 0.7 1.173 -2.217 -20.057
Li et al. 2025 269.182 -35.298 0.707 1.243 -2.189 –
Wei et al. 2025 269.169 -35.303 0.708 1.173 -2.212 –
Almeida et al. 2025 269.178 -35.302 – – – –
Hunt & Reffert 2024 269.186 -35.284 0.701 1.145 -2.23 -24.19
Cavallo et al. 2024 269.174 -35.314 0.7 – – –
Hunt & Reffert 2023 269.186 -35.284 0.701 1.145 -2.23 -24.19
Just et al. 2023 269.218 -35.271 – – – –
Tarricq et al. 2022 269.176 -35.296 0.679 1.155 -2.24 –
Dias et al. 2021 269.178 -35.302 0.707 1.246 -2.184 -18.671
Cantat-Gaudin et al. 2020 269.182 -35.298 0.707 1.243 -2.189 –
Cantat-Gaudin & Anders 2020 269.182 -35.298 0.707 1.243 -2.189 –
Bossini et al. 2019 269.182 -35.298 – – – –
Soubiran et al. 2018 269.182 -35.298 – – – -18.36
Bica et al. 2019 269.205 -35.259 – – – –
Cantat-Gaudin et al. 2018 269.182 -35.298 0.707 1.243 -2.189 –
Kharchenko et al. 2016 269.218 -35.271 – – – –
Dias et al. 2014 269.192 -35.267 – -2.92 -4.29 –
Kharchenko et al. 2013 269.227 -35.27 – 1.35 -1.91 –
Piskunov et al. 2008 269.182 -35.272 – – – –
Kharchenko et al. 2005 269.19 -35.27 – 3.82 -0.13 –
Kharchenko et al. 2003 269.08 -35.37 – -2.38 -2.43 –

💡 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– 1.32 0.85 0.72 253 0.159 800 0.63 –
Li et al. 2025 1.32 0.85 – 523 0.159 – – –
Wei et al. 2025 1.98 1.22 – 282 0.250 989 0.63 –
Almeida et al. 2025 1.22 0.61 – 589 – 364 – –
Hunt & Reffert 2024 – – – – – 1351(1) – –
Cavallo et al. 2024 1.13 1.73 – 178 -0.650 – – –
Hunt & Reffert 2023 1.37 0.91 0.72 219 – – – –
Just et al. 2023 – – – 224 – 610 – –
Tarricq et al. 2022 1.30 – – 490 – – – –
Dias et al. 2021 1.22 0.61 – 589 0.324 – – –
Cantat-Gaudin et al. 2020 1.35 0.81 – 437 – – – –
Cantat-Gaudin & Anders 2020 1.36 – – – – – – –
Bossini et al. 2019 1.26 0.93 – 368 0.000 – – –
Soubiran et al. 2018 1.36 – – – – – – –
Cantat-Gaudin et al. 2018 1.36 – – – – – – –
Kharchenko et al. 2016 1.98 1.48 – 224 – – – –
Kharchenko et al. 2013 1.98 1.48 – 224 – – – –
Piskunov et al. 2008 1.00 0.68 – 204 – – – –
Kharchenko et al. 2005 1.00 0.68 – 204 – – – –
Kharchenko et al. 2003 0.62 0.31 – – – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 330 87.3 269.17 -35.3 0.7 1.17 -2.23 -20.06 0.0

💡 Note: The % column shows the percentage of members that Trumpler 30 shares with each listed object.

Visualization
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Trumpler 30 UCC
Trumpler 30 HUNT23
Trumpler 30 CANTAT20
Galactocentric position diagram