Trumpler 5

(Collinder 105; MWSC 933; OCL 494; FSR 0989; FoF 369)

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1.0 UTI
1.0
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 4578
Stellar density (N50/rad) 81.1 [N/pc2]
C3 classification AA
  • 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
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Trumpler 5 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 an extremely massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Note: This object shares a very small percentage of members with 2 later reported entries. See table with shared members information.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.93 (50th percentile).

Rain et al. (2021)
The red limit of the straggler area is BP-RP=1.30. There are several stragglers candidates with a radius larger than the cluster's apparent radius (r=15.4 arcmin (Dias et al., 2002A&A...389..871D, Cat. B/ocl). Apparently, stars Gaia DR2 3326777286895609344, Gaia DR2 3326807557824686336, Gaia DR2 3326824565895691392 are massive stragglers. This object probably suffers from differential reddening. We suggest exploring this effect in future works.

Ahumada & Lapasset (2007)
Only straggler candidates inside a radius of 8' around the centre of coordinates have been considered. The red limit of the blue straggler area is (B-V)=0.87.

Data
🔍 Search references for Trumpler 5 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 99.125 9.468 0.302 -0.612 0.267 50.75
Bijavara Seshashayana et al. 2025 99.098 9.527 – – – –
Otto et al. 2026 99.127 9.459 – -0.59 0.27 50.6
Li et al. 2025 99.126 9.465 0.284 -0.59 0.273 –
Guerco et al. 2025 99.3 9.54 0.3 -0.65 0.24 50.5
Hu & Soubiran 2025 99.126 9.472 – – – –
Carrasco-Varela et al. 2025 99.36 9.427 – – – –
Almeida et al. 2025 99.128 9.46 – – – –
Hunt & Reffert 2024 99.127 9.459 0.302 -0.618 0.269 51.318
Cavallo et al. 2024 99.126 9.472 0.301 – – –
Hunt & Reffert 2023 99.127 9.459 0.302 -0.618 0.269 51.318
Just et al. 2023 99.112 9.472 – – – –
Jadhav & Subramaniam 2021 99.126 9.465 – – – –
Jaehnig et al. 2021 99.129 9.472 0.312 -0.606 0.29 –
Rain et al. 2021 99.126 9.465 0.284 -0.59 0.273 –
Dias et al. 2021 99.128 9.46 0.283 -0.586 0.285 51.472
Spina et al. 2021 99.13 9.467 0.284 -0.591 0.287 –
Cantat-Gaudin et al. 2020 99.126 9.465 0.284 -0.59 0.273 –
Donor et al. 2020 99.12 9.47 – -0.58 0.23 50.5
Zhong et al. 2020 99.126 9.465 – -0.59 0.273 47.98
Cantat-Gaudin & Anders 2020 99.126 9.465 0.284 -0.59 0.273 –
Liu & Pang 2019 99.127 9.475 0.317 -0.544 0.248 –
Soubiran et al. 2018 99.126 9.465 – – – 51.33
Bica et al. 2019 99.119 9.455 – – – –
Cantat-Gaudin et al. 2018 99.126 9.465 0.284 -0.59 0.273 –
Loktin & Popova 2017 99.18 9.434 – -0.127 -0.371 –
Kharchenko et al. 2016 99.112 9.472 – – – –
Dias et al. 2014 99.175 9.433 – 0.77 0.59 –
Kharchenko et al. 2013 99.12 9.47 – -0.24 -0.37 –
Gozha et al. 2012 99.175 9.433 – – – –
Bukowiecki et al. 2011 99.121 9.469 – – – –
Ahumada & Lapasset 2007 99.175 9.433 – – – –
van den Bergh 2006 99.175 9.433 – – – –
Dias et al. 2002 99.175 9.433 – 0.77 0.59 –

💡 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– 3.07 1.895 2.17 3866 -0.403 25382 – 58
Bijavara Seshashayana et al. 2025 – 1.20 – 4270 -0.480(14) – – –
Otto et al. 2026 – – – 4266 -0.440(15) – – –
Li et al. 2025 3.04 2.05 – 3752 -0.441 – – –
Guerco et al. 2025 – – – 4270 -0.440 – – –
Hu & Soubiran 2025 – – – – -0.230(5) – – –
Carrasco-Varela et al. 2025 3.26 2.02 – 3459 -0.400 – – 45(1)
Almeida et al. 2025 3.26 2.02 – 3459 – 26209 – –
Hunt & Reffert 2024 – – – – – 24555(1) – –
Cavallo et al. 2024 2.94 1.79 – 3311 -0.080 – – –
Hunt & Reffert 2023 2.96 1.71 2.17 2173 – – – –
Just et al. 2023 – – – 3162 – 2844 – –
Spina et al. 2022 – – – – -0.440 – – –
Jadhav & Subramaniam 2021 3.05 1.20 – 4266 – 43375 – 33(1)
Jaehnig et al. 2021 3.22(1) – – – – – – –
Rain et al. 2021 3.19 1.96 – 3981 – – – 103
Dias et al. 2021 3.26 2.02 – 3459 -0.372 – – –
Spina et al. 2021 3.35 – – 4266 -0.434(20) – – –
Cantat-Gaudin et al. 2020 3.05 1.20 – 4266 – – – –
Kounkel et al. 2020 3.09 1.82 – 1349 – – – –
Donor et al. 2020 – – – – -0.440 – – –
Zhong et al. 2020 2.75 1.97 – 9500 -0.590 – – –
Cantat-Gaudin & Anders 2020 3.19 – – – – – – –
Liu & Pang 2019 – – – 1660 0.000 – – –
Soubiran et al. 2018 3.19 – – – – – – –
Cantat-Gaudin et al. 2018 3.19 – – – – – – –
Loktin & Popova 2017 4.66 2.37 – 1698 – – – –
Kharchenko et al. 2016 2.75 1.97 – 3162 – – – –
Perren et al. 2015 2.80(1) 1.42(1) – 5012(1) 0.190(1) – – –
Kharchenko et al. 2013 2.75 1.97 – 3162 -0.300 – – –
Gozha et al. 2012 2.40 – – 5012 -0.300 – – –
Bukowiecki et al. 2011 3.39(1) 1.77 – 3548 – – – –
Ahumada & Lapasset 2007 – 1.83 – 4074 – – – 70
van den Bergh 2006 3.00 1.83 – 4074 – – – –
Dias et al. 2002 2.82 1.96 – 3981 -0.403 – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0336 0.5 99.1 9.52 0.48 -0.54 0.21 40.26 0.0
OC 0337 0.5 99.2 9.4 0.33 -0.7 0.27 50.39 0.0

💡 Note: The % column shows the percentage of members that Trumpler 5 shares with each listed object.

Visualization
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Trumpler 5 UCC
Trumpler 5 HUNT23
Trumpler 5 CANTAT20
Galactocentric position diagram