Trumpler 16

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0.89 UTI
0.84
CN
1.0
Cdens
1.0
CC3
0.81
Clit
1.0
Cdup
Nm (P>50%) 332
Core radius and density 2.5 [pc], 8.8 [pc-2]
C3 classification AA
  • CN 0.84 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.81 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Trumpler 16 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, very young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is well-studied in the literature.

Palma et al. (2025)
Part of multiple system G21, along with ASCC_62, Gulliver_52, NGC_3496 and Collinder_228.

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

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.44 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.44 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2718, e_all=0.2512.

Ahumada & Lapasset (2007)
The dereddened colour-magnitude diagram was examined (1973A&AS...12..331F). The cluster apparent diameter was taken from (1992AJ....104.1865T).

Data
🔍 Search references for Trumpler 16 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 99999– 161.256 -59.715 0.403 -6.889 2.586 -0.073
Almeida et al. 2025 161.25 -59.694 – – – –
Hunt & Reffert 2024 161.265 -59.697 0.402 -6.908 2.606 -2.885
Celli et al. 2024 161.253 -59.7 – – – –
Cavallo et al. 2024 161.236 -59.736 0.403 – – –
Hunt & Reffert 2023 161.265 -59.697 0.402 -6.908 2.606 -2.885
Jaehnig et al. 2021 161.236 -59.708 0.416 -6.88 2.556 –
Rain et al. 2021 161.253 -59.7 0.389 -6.864 2.509 –
Dias et al. 2021 161.25 -59.694 0.39 -6.903 2.521 –
Cantat-Gaudin et al. 2020 161.253 -59.7 0.389 -6.864 2.509 –
Cantat-Gaudin & Anders 2020 161.253 -59.7 0.389 -6.864 2.509 –
Cantat-Gaudin et al. 2018 161.253 -59.7 0.389 -6.864 2.509 –
Dias et al. 2018 – – – -7.08 2.3 –
Loktin & Popova 2017 161.295 -59.717 – -6.94 1.41 -25.0
Sampedro et al. 2017 161.292 -59.717 – -6.36 1.15 –
Dias et al. 2014 161.292 -59.717 – -6.94 1.41 –
Gozha et al. 2012 161.292 -59.717 – – – –
Piskunov et al. 2008 161.287 -59.713 – – – –
Kharchenko et al. 2007 161.29 -59.72 – 0.12 – -25.0
Ahumada & Lapasset 2007 161.25 -59.717 – – – –
van den Bergh 2006 161.3 -59.717 – – – –
Kharchenko et al. 2005 161.29 -59.72 – -11.1 4.02 -25.0
Kharchenko et al. 2003 161.26 -59.72 – -10.36 5.24 –
Dias et al. 2002 161.292 -59.717 – -6.94 1.41 -22.78
Dambis 1999 161.292 -59.717 – – – –
Lynga 1987 161.269 -59.709 – – – -16.0
van den Bergh & Hagen 1975 160.8 -59.45 – – – –

💡 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– 2.4 1.53 2.3 6 0.224 1114 – 0
Almeida et al. 2025 2.08 1.51 – 5 – 574 – –
Hunt & Reffert 2024 2.38 1.67 2.30 6 – 1796(1) – –
Celli et al. 2024 – – – 14 – 1107 – –
Cavallo et al. 2024 1.49 1.53 – 21 0.100 – – –
Hunt & Reffert 2023 2.38 1.67 2.30 6 – – – –
Jaehnig et al. 2021 2.40(1) – – – – – – –
Rain et al. 2021 2.40 1.14 – 1 – – – 0
Dias et al. 2021 2.08 1.51 – 5 0.348 – – –
Cantat-Gaudin et al. 2020 2.11 1.16 – 13 – – – –
Kounkel et al. 2020 2.16 2.14 – 10 – – – –
Cantat-Gaudin & Anders 2020 2.40 – – – – – – –
Cantat-Gaudin et al. 2018 2.40 – – – – – – –
Loktin & Popova 2017 2.84 1.69 – 6 – – – –
Gozha et al. 2012 3.90 – – 5 – 1122 – –
Piskunov et al. 2008 2.84 1.64 – 8 – – – –
Ahumada & Lapasset 2007 – 1.55 – 6 – – – 0
van den Bergh 2006 2.67 1.55 – 6 – – – –
Kharchenko et al. 2005 2.84 1.64 – 8 – – – –
Kharchenko et al. 2003 2.70 1.26 – – – – – –
Dias et al. 2002 2.90 1.14 – 1 – – – –
Dambis 1999 2.56 1.53 – 3 – – – –
Lynga 1987 2.90 1.48 – 10 – – – –

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

Visualization
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Trumpler 16 UCC
Trumpler 16 HUNT23
Trumpler 16 CANTAT20
Galactocentric position diagram