Trumpler 4

(Collinder 80; IC 2157; MWSC 722; OCL 465; FSR 0867)

Click to load Aladin Lite
0.90 UTI
0.74
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 98
Stellar density (N50/rad) 22.8 [N/pc2]
C3 classification AB
  • CN 0.74 Moderately populated
  • 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 4 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate 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.

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

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Trumpler 4 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 91.184 24.096 0.463 0.965 -2.989 -27.386
Li et al. 2025 91.183 24.091 0.448 0.959 -2.982 –
Almeida et al. 2025 91.186 24.084 – – – –
Zhang et al. 2024 91.201 24.087 – – – –
Hunt & Reffert 2024 91.201 24.087 0.474 0.978 -3.019 –
Cavallo et al. 2024 91.184 24.088 0.475 – – –
Hunt & Reffert 2023 91.201 24.087 0.474 0.978 -3.019 –
Almeida et al. 2023 91.18 24.087 – – – –
Just et al. 2023 91.199 24.071 – – – –
Jaehnig et al. 2021 91.195 24.077 0.487 0.953 -2.981 –
Rain et al. 2021 91.183 24.091 0.448 0.959 -2.982 –
Dias et al. 2021 91.186 24.084 0.442 0.966 -2.99 –
Cantat-Gaudin et al. 2020 91.183 24.091 0.448 0.959 -2.982 –
Cantat-Gaudin & Anders 2020 91.183 24.091 0.448 0.959 -2.982 –
Bossini et al. 2019 91.183 24.091 – – – –
Bica et al. 2019 91.2 24.077 – – – –
Cantat-Gaudin et al. 2018 91.183 24.091 0.448 0.959 -2.982 –
Loktin & Popova 2017 91.215 24.07 – -0.172 -0.85 –
Kharchenko et al. 2016 91.199 24.071 – – – –
Dias et al. 2014 91.208 24.056 – -1.05 -3.36 –
Kharchenko et al. 2013 91.207 24.07 – -0.54 -3.01 –
van den Bergh 2006 91.25 24.0 – – – –
Dias et al. 2002 91.208 24.056 – -1.05 -3.36 –

💡 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– 2.04 1.62 0.6 63 -0.068 212 0.58 0.0
Li et al. 2025 1.79 1.54 – 61 -0.166 – – –
Almeida et al. 2025 1.89 1.65 – 36 – 235 – –
Zhang et al. 2024 – – – – -0.204(1) – – –
Hunt & Reffert 2024 – – – – – 480(1) – –
Cavallo et al. 2024 2.00 1.30 – 178 0.530 – – –
Hunt & Reffert 2023 1.92 1.41 0.60 74 – – – –
Almeida et al. 2023 1.88 1.59 – 55 -0.037 189(1) 0.58 –
Just et al. 2023 – – – 79 – 110 – –
Jaehnig et al. 2021 2.08(1) – – – – – – –
Rain et al. 2021 2.10 1.49 – 41 – – – 0
Dias et al. 2021 1.89 1.65 – 36 -0.098 – – –
Cantat-Gaudin et al. 2020 2.02 1.10 – 151 – – – –
Cantat-Gaudin & Anders 2020 2.10 – – – – – – –
Bossini et al. 2019 2.41 1.51 – 41 0.000 – – –
Cantat-Gaudin et al. 2018 2.10 – – – – – – –
Loktin & Popova 2017 1.90 1.71 – 65 – – – –
Kharchenko et al. 2016 2.31 1.74 – 79 – – – –
Kharchenko et al. 2013 2.31 1.74 – 79 – – – –
van den Bergh 2006 2.04 1.71 – 63 – – – –
Dias et al. 2002 2.04 1.70 – 63 – – – –

(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 0305 36.7 91.19 24.09 0.47 0.97 -2.99 – 0.0

💡 Note: The % column shows the percentage of members that Trumpler 4 shares with each listed object.

Visualization
ℹī¸
Trumpler 4 UCC
Trumpler 4 HUNT23
Trumpler 4 CANTAT20
Galactocentric position diagram