Trumpler 7

(Collinder 146; MWSC 1229; OCL 635; ESO 492 16; FSR 1288; FoF 51)

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0.91 UTI
0.82
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 275
Radius (P>50% members) 5.3 [arcmin]
  • CN 0.82 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 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Trumpler 7 is a rich, very dense object of 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, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.
Relatively close Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Trumpler 7 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 – 111.848 -23.952 0.576 -2.472 3.362 28.547
Li et al. 2025 111.849 -23.949 0.554 -2.484 3.329 –
Almeida et al. 2025 111.851 -23.951 – – – –
Hunt & Reffert 2024 111.844 -23.951 0.577 -2.474 3.361 12.507
Cavallo et al. 2024 111.846 -23.961 0.578 – – –
Hunt & Reffert 2023 111.844 -23.951 0.577 -2.474 3.361 12.507
Just et al. 2023 111.82 -23.958 – – – –
Jaehnig et al. 2021 111.845 -23.947 0.596 -2.485 3.342 –
Rain et al. 2021 111.849 -23.949 0.554 -2.484 3.329 –
Dias et al. 2021 111.851 -23.951 0.557 -2.501 3.322 –
Cantat-Gaudin et al. 2020 111.849 -23.949 0.554 -2.484 3.329 –
Cantat-Gaudin & Anders 2020 111.849 -23.949 0.554 -2.484 3.329 –
Liu & Pang 2019 111.844 -23.945 0.563 -2.474 3.332 –
Bossini et al. 2019 111.849 -23.949 – – – –
Bica et al. 2019 111.841 -23.946 – – – –
Cantat-Gaudin et al. 2018 111.849 -23.949 0.554 -2.484 3.329 –
Loktin & Popova 2017 111.84 -23.95 – -3.512 2.873 32.9
Kharchenko et al. 2016 111.82 -23.958 – – – –
Dias et al. 2014 111.842 -23.95 – -2.99 2.64 –
Kharchenko et al. 2013 111.825 -23.96 – -4.1 4.19 32.9
Gozha et al. 2012 111.842 -23.95 – – – –
Piskunov et al. 2008 111.832 -23.951 – – – –
Kharchenko et al. 2007 111.84 -23.95 – 0.15 – 32.87
van den Bergh 2006 111.838 -23.957 – – – –
Kharchenko et al. 2005 111.84 -23.95 – -2.26 3.07 32.87
Kharchenko et al. 2003 111.82 -23.93 – 1.87 -1.07 –
Dias et al. 2002 111.842 -23.95 – -2.99 2.64 32.87
Dambis 1999 111.842 -23.95 – – – –

💡 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] Bfr BSS
Li et al. 2025 1.62 1.05 – 64 -0.071 – – –
Almeida et al. 2025 1.55 1.03 – 153 – 413 – –
Hunt & Reffert 2024 – – – – – 838* – –
Cavallo et al. 2024 1.65 0.74 – 240 0.300 – – –
Hunt & Reffert 2023 1.60 0.77 1.27 113 – – – –
Just et al. 2023 – – – 100 – 214 – –
Jaehnig et al. 2021 1.70* – – – – – – –
Rain et al. 2021 1.71 0.84 – 49 – – – 0
Dias et al. 2021 1.55 1.03 – 153 -0.100 – – –
Cantat-Gaudin et al. 2020 1.71 0.78 – 66 – – – –
Cantat-Gaudin & Anders 2020 1.71 – – – – – – –
Liu & Pang 2019 – – – 32 -0.250 – – –
Bossini et al. 2019 1.72 0.84 – 49 0.000 – – –
Cantat-Gaudin et al. 2018 1.71 – – – – – – –
Loktin & Popova 2017 1.50 0.80 – 30 – – – –
Kharchenko et al. 2016 1.66 0.97 – 100 – – – –
Kharchenko et al. 2013 1.66 0.97 – 100 – – – –
Gozha et al. 2012 1.47 – – 27 – 282 – –
Piskunov et al. 2008 1.47 0.84 – 52 – – – –
van den Bergh 2006 1.47 0.84 – 27 – – – –
Kharchenko et al. 2005 1.47 0.84 – 52 – – – –
Kharchenko et al. 2003 1.47 0.84 – – – – – –
Dias et al. 2002 1.47 0.82 – 27 – – – –
Dambis 1999 1.35 0.86 – 11 – – – –

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

Visualization
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Trumpler 7 UCC
Trumpler 7 HUNT23
Trumpler 7 CANTAT20
Galactocentric position diagram