Trumpler 28

(Collinder 337; VDBH 238; MWSC 2641; OCL 1029; vdBergh-Hagen 238; ESO 455 25; FoF 2243)

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0.91 UTI
0.79
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 197
Stellar density (N50/rad) 42.2 [N/pc2]
C3 classification AB
  • CN 0.79 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 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
ℹī¸
Trumpler 28 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is very well-studied in the literature.

Note: This object shares a significant percentage of members with 3 later reported entries. See table with shared members information.

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Trumpler 28 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 264.224 -32.464 0.646 -0.844 -2.826 -48.36
Almeida et al. 2025 264.236 -32.468 – – – –
Hunt & Reffert 2024 264.232 -32.476 0.659 -0.828 -2.813 -35.935
Cavallo et al. 2024 264.22 -32.459 0.665 – – –
Hunt & Reffert 2023 264.232 -32.476 0.659 -0.828 -2.813 -35.935
Just et al. 2023 264.246 -32.481 – – – –
Jaehnig et al. 2021 264.231 -32.466 0.736 -0.771 -2.815 –
Rain et al. 2021 264.231 -32.469 0.678 -0.851 -2.824 –
Dias et al. 2021 264.236 -32.468 0.669 -0.833 -2.79 -39.396
Cantat-Gaudin et al. 2020 264.231 -32.469 0.678 -0.851 -2.824 –
Cantat-Gaudin & Anders 2020 264.231 -32.469 0.678 -0.851 -2.824 –
Liu & Pang 2019 264.219 -32.482 0.704 -0.826 -2.796 –
Dias et al. 2019 264.229 -32.469 0.678 -0.851 -2.824 -15.81
Soubiran et al. 2018 264.231 -32.469 – – – -23.47
Bica et al. 2019 264.209 -32.473 – – – –
Cantat-Gaudin et al. 2018 264.231 -32.469 0.678 -0.851 -2.824 –
Loktin & Popova 2017 264.255 -32.484 – -0.418 -1.86 7.0
Kharchenko et al. 2016 264.246 -32.481 – – – –
Dias et al. 2014 264.25 -32.483 – -0.56 -1.8 –
Kharchenko et al. 2013 264.255 -32.48 – -0.78 -1.78 7.0
Gozha et al. 2012 264.25 -32.483 – – – –
Piskunov et al. 2008 264.246 -32.481 – – – –
van den Bergh 2006 264.25 -32.483 – – – –
Kharchenko et al. 2005 264.25 -32.48 – 0.78 -2.12 –
Kharchenko et al. 2003 264.21 -32.47 – 1.72 -2.21 –
Dias et al. 2002 264.25 -32.483 – -0.56 -1.8 7.0
Dambis 1999 264.25 -32.483 – – – –

💡 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– 1.355 2.26 1.29 19 0.212 427 – 0.0
Almeida et al. 2025 1.35 2.24 – 19 – 480 – –
Hunt & Reffert 2024 – – – – – 588(1) – –
Cavallo et al. 2024 1.30 2.71 – 14 -1.010 – – –
Hunt & Reffert 2023 1.41 2.35 1.29 55 – – – –
Just et al. 2023 – – – 4 – 374 – –
Tarricq et al. 2022 1.35 – – 93 – – – –
Jaehnig et al. 2021 1.36(1) – – – – – – –
Rain et al. 2021 1.42 2.26 – 19 – – – 0
Dias et al. 2021 1.35 2.24 – 19 0.174 – – –
Cantat-Gaudin et al. 2020 1.40 1.79 – 78 – – – –
Cantat-Gaudin & Anders 2020 1.42 – – – – – – –
Liu & Pang 2019 – – – 295 0.250 – – –
Dias et al. 2019 1.38 1.77 – 32 0.112 – – –
Soubiran et al. 2018 1.42 – – – – – – –
Cantat-Gaudin et al. 2018 1.42 – – – – – – –
Loktin & Popova 2017 1.36 2.32 – 22 – – – –
Kharchenko et al. 2016 1.47 2.97 – 4 – – – –
Kharchenko et al. 2013 1.47 2.97 – 4 0.326 – – –
Gozha et al. 2012 1.34 – – 19 – 214 – –
Piskunov et al. 2008 1.34 2.26 – 8 – – – –
van den Bergh 2006 1.34 2.26 – 19 – – – –
Kharchenko et al. 2005 1.34 2.26 – 8 – – – –
Kharchenko et al. 2003 1.34 2.26 – – – – – –
Dias et al. 2002 1.34 2.27 – 19 0.326 – – –
Dambis 1999 1.23 2.36 – 22 – – – –

(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 569 71.1 264.22 -32.46 0.66 -0.78 -2.81 -37.2 0.05
Ryu 144 0.5 264.02 -32.63 0.35 -1.38 -2.86 -42.75 0.22
Trumpler 28b 0.5 264.25 -32.47 0.26 -0.93 -2.52 -12.36 0.29

💡 Note: The % column shows the percentage of members that Trumpler 28 shares with each listed object.

Visualization
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Trumpler 28 UCC
Trumpler 28 HUNT23
Trumpler 28 CANTAT20
Galactocentric position diagram