Trumpler 20

(Collinder 262; MWSC 2060; Harvard 7; OCL 888; ESO 131 13; FSR 1624)

Click to load Aladin Lite
1.0 UTI
1.0
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 1541
Radius (P>50% members) 5.2 [arcmin]
  • CN 1.0 Very rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Trumpler 20 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a very massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.

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

Distant Moderate extinction Very massive Near-solar metallicity Old

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Trumpler 20 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 189.893 -60.641 0.267 -7.108 0.187 -40.238
Li et al. 2025 189.882 -60.637 0.251 -7.089 0.18 –
Hu & Soubiran 2025 189.894 -60.64 – – – –
Carrasco-Varela et al. 2025 190.134 -60.74 – – – –
Almeida et al. 2025 189.849 -60.645 – – – –
Hunt & Reffert 2024 189.888 -60.633 0.271 -7.11 0.193 -40.333
Cavallo et al. 2024 189.894 -60.64 0.272 – – –
Hunt & Reffert 2023 189.888 -60.633 0.271 -7.11 0.193 -40.333
Just et al. 2023 189.929 -60.632 – – – –
Rain et al. 2021 189.882 -60.637 0.251 -7.089 0.18 –
Dias et al. 2021 189.849 -60.645 0.252 -7.088 0.183 -38.785
Cantat-Gaudin et al. 2020 189.882 -60.637 0.251 -7.089 0.18 –
SΓ‘nchez et al. 2020 189.879 -60.633 – -7.118 0.251 –
Cantat-Gaudin & Anders 2020 189.882 -60.637 0.251 -7.089 0.18 –
Soubiran et al. 2018 189.882 -60.637 – – – -39.78
Bica et al. 2019 189.879 -60.638 – – – –
Cantat-Gaudin et al. 2018 189.882 -60.637 0.251 -7.089 0.18 –
Kharchenko et al. 2016 189.929 -60.632 – – – –
Dias et al. 2014 189.879 -60.633 – -2.22 -1.94 –
Kharchenko et al. 2013 189.937 -60.635 – -14.65 -3.12 -40.8
Gozha et al. 2012 189.879 -60.633 – – – –
Dias et al. 2002 189.879 -60.633 – -2.22 -1.94 -40.8

πŸ’‘ 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 3.52 1.34 – 1519 0.059 – – –
Hu & Soubiran 2025 – – – – -0.190* – – –
Carrasco-Varela et al. 2025 3.39 1.43 – 1510 -0.050 – – 0.06*
Almeida et al. 2025 3.39 1.43 – 1510 – 4874 – –
Hunt & Reffert 2024 – – – – – 15259* – –
Cavallo et al. 2024 2.72 1.69 – 2042 -0.300 – – –
Hunt & Reffert 2023 3.37 1.28 0.42 1585 – – – –
Just et al. 2023 – – – 2113 – 8710 – –
Rain et al. 2021 3.57 1.43 – 1288 – – – 12
Dias et al. 2021 3.39 1.43 – 1510 0.094 – – –
Cantat-Gaudin et al. 2020 3.39 0.88 – 1862 – – – –
Cantat-Gaudin & Anders 2020 3.57 – – – – – – –
Soubiran et al. 2018 3.57 – – – – – – –
Cantat-Gaudin et al. 2018 3.57 – – – – – – –
Kharchenko et al. 2016 3.31 0.97 – 2113 – – – –
Kharchenko et al. 2013 3.31 0.97 – 2113 -0.110 – – –
Gozha et al. 2012 3.30 – – 1288 -0.110 – – –
Dias et al. 2002 3.30 1.43 – 1288 0.170 – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0583 1.6 189.92 -60.66 0.21 -7.1 0.17 -41.01 0.0

πŸ’‘ Note: The % column shows the percentage of members that Trumpler 20 shares with each listed object.

Visualization
ℹ️
Trumpler 20 UCC
Trumpler 20 HUNT23
Trumpler 20 CANTAT20
Galactocentric position diagram