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
Nm (P>50%) 275
Core radius and density 1.1 [pc], 14 [pc-2]
C3 classification AB
  • 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 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
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.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Richer et al. (2021)
The expected number of WDs is 4.8, 0 WD candidates found, and 0 WD candidates found in the wide search.

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1077, e_all=0.0832.

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=7.692, Av=0.841, [Fe/H]= 0.00 were taken from Bossini et al. (2019A&A...623A.108B, Cat. J/A+A/623/A108).

Data
🔍 Search references for Trumpler 7 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 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 –
Richer et al. 2021 111.845 -23.953 0.577 -2.485 3.328 –
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 –
Dias et al. 2018 – – – -2.4 3.58 –
Dib et al. 2018 111.825 -23.96 – – – –
Loktin & Popova 2017 111.84 -23.95 – -3.512 2.873 32.9
Sampedro et al. 2017 111.842 -23.95 – -3.0 2.22 –
Joshi et al. 2016 111.825 -23.96 – – – –
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 – – – –
Bukowiecki et al. 2011 111.833 -23.958 – – – –
Piskunov et al. 2008 111.832 -23.951 – – – –
Kharchenko et al. 2007 111.84 -23.95 – 0.15 – 32.87
Ahumada & Lapasset 2007 111.85 -23.95 – – – –
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 – – – –
Lynga 1987 111.829 -24.032 – – – –

💡 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– 1.62 0.85 1.27 64 -0.071 348 – 0
Li et al. 2025 1.62 1.05 – 64 -0.071 – – –
Almeida et al. 2025 1.55 1.03 – 153 – 413 – –
Hunt & Reffert 2024 1.60 0.77 1.27 113 – 838(1) – –
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(1) – – – – – – –
Rain et al. 2021 1.71 0.85 – 49 – – – 0
Richer et al. 2021 – 0.93 – 80 – – – –
Dias et al. 2021 1.55 1.03 – 153 -0.100 – – –
Cantat-Gaudin et al. 2020 1.71 0.78 – 66 – – – –
Kounkel et al. 2020 1.84 1.08 – 81 – – – –
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 – – – – – – –
Dib et al. 2018 1.66 – – 100 – – – –
Loktin & Popova 2017 1.50 0.82 – 30 – – – –
Joshi et al. 2016 1.66 0.98 – 100 – 282 – –
Kharchenko et al. 2016 1.66 0.98 – 100 – – – –
Kharchenko et al. 2013 1.66 0.98 – 100 – – – –
Bukowiecki et al. 2012 – – – – – 495 – –
Gozha et al. 2012 1.47 – – 27 – 282 – –
Bukowiecki et al. 2011 1.75(1) 0.95 – 32 – – – –
Piskunov et al. 2008 1.47 0.85 – 52 – – – –
Ahumada & Lapasset 2007 – 0.85 – 27 – – – 0
van den Bergh 2006 1.47 0.85 – 27 – – – –
Kharchenko et al. 2005 1.47 0.85 – 52 – – – –
Kharchenko et al. 2003 1.47 0.85 – – – – – –
Dias et al. 2002 1.47 0.84 – 27 – – – –
Dambis 1999 1.35 0.87 – 11 – – – –
Lynga 1987 1.60 0.88 – 25 – – – –

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

Visualization
ℹī¸
Trumpler 7 UCC
Trumpler 7 HUNT23
Trumpler 7 CANTAT20
Galactocentric position diagram