Trumpler 26

(Collinder 331; MWSC 2604; Harvard 15; OCL 1032; ESO 454 33)

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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%) 238
Radius (P>50% members) 6.5 [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 26 is a 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 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.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Trumpler 26 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 – 262.132 -29.49 0.631 -0.897 -3.106 -10.291
Li et al. 2025 262.126 -29.487 0.623 -0.873 -3.082 –
Almeida et al. 2025 262.135 -29.488 – – – –
Hunt & Reffert 2024 262.126 -29.489 0.626 -0.893 -3.104 -18.565
Cavallo et al. 2024 262.14 -29.494 0.628 – – –
Hunt & Reffert 2023 262.126 -29.489 0.626 -0.893 -3.104 -18.565
Just et al. 2023 262.124 -29.485 – – – –
Tarricq et al. 2022 262.137 -29.477 0.628 -0.914 -3.12 –
Dias et al. 2021 262.135 -29.488 0.629 -0.866 -3.084 -7.528
Cantat-Gaudin et al. 2020 262.126 -29.487 0.623 -0.873 -3.082 –
Cantat-Gaudin & Anders 2020 262.126 -29.487 0.623 -0.873 -3.082 –
Bossini et al. 2019 262.126 -29.487 – – – –
Soubiran et al. 2018 262.126 -29.487 – – – -7.59
Bica et al. 2019 262.135 -29.504 – – – –
Cantat-Gaudin et al. 2018 262.126 -29.487 0.623 -0.873 -3.082 –
Kharchenko et al. 2016 262.124 -29.485 – – – –
Dias et al. 2014 262.133 -29.497 – 0.24 -2.37 –
Kharchenko et al. 2013 262.132 -29.485 – -1.0 -1.1 -9.6
Gozha et al. 2012 262.133 -29.497 – – – –
Piskunov et al. 2008 262.135 -29.504 – – – –
Kharchenko et al. 2005 262.14 -29.5 – -2.41 -1.52 –
Kharchenko et al. 2003 262.14 -29.48 – -3.51 -0.01 –
Dias et al. 2002 262.133 -29.497 – 0.24 -2.37 -9.6

💡 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 1.62 – 480 0.240 – – –
Almeida et al. 2025 1.35 1.76 – 448 – 298 – –
Hunt & Reffert 2024 – – – – – 1540* – –
Cavallo et al. 2024 0.96 2.45 – 331 -0.800 – – –
Hunt & Reffert 2023 1.49 1.74 0.83 197 – – – –
Just et al. 2023 – – – 148 – 172 – –
Tarricq et al. 2022 1.48 – – 269 – – – –
Dias et al. 2021 1.35 1.76 – 448 0.249 – – –
Cantat-Gaudin et al. 2020 1.52 1.78 – 251 – – – –
Cantat-Gaudin & Anders 2020 1.53 – – – – – – –
Bossini et al. 2019 1.30 1.51 – 364 0.000 – – –
Soubiran et al. 2018 1.53 – – – – – – –
Cantat-Gaudin et al. 2018 1.53 – – – – – – –
Kharchenko et al. 2016 1.49 2.26 – 148 – – – –
Kharchenko et al. 2013 1.49 2.26 – 148 – – – –
Gozha et al. 2012 1.00 – – 708 – 2884 – –
Piskunov et al. 2008 2.80 0.43 – 240 – – – –
Kharchenko et al. 2005 2.80 0.43 – 240 – – – –
Kharchenko et al. 2003 2.80 1.24 – – – – – –
Dias et al. 2002 1.00 1.08 – 708 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 332 79.8 262.13 -29.49 0.63 -0.9 -3.11 -10.29 0.0

💡 Note: The % column shows the percentage of members that Trumpler 26 shares with each listed object.

Visualization
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Trumpler 26 UCC
Trumpler 26 HUNT23
Trumpler 26 CANTAT20
Galactocentric position diagram