Trumpler 8

(Collinder 167; NGC 2479; MWSC 1380; OCL 623; ESO 561 01; FSR 1271)

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0.96 UTI
0.78
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 192
Stellar density (N50/rad) 23.2 [N/pc2]
C3 classification AA
  • CN 0.78 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 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Trumpler 8 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster (see Parameters). It is very well-studied in the literature.

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

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Trumpler 8 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 118.768 -17.735 0.607 -4.318 1.097 40.212
Li et al. 2025 118.762 -17.732 0.626 -4.318 1.053 –
Hu & Soubiran 2025 118.765 -17.73 – – – –
Almeida et al. 2025 118.755 -17.731 – – – –
Hunt & Reffert 2024 118.772 -17.734 0.611 -4.326 1.097 34.536
Cavallo et al. 2024 118.765 -17.731 0.612 – – –
Hunt & Reffert 2023 118.772 -17.734 0.611 -4.326 1.097 34.536
Almeida et al. 2023 118.751 -17.747 – – – –
Just et al. 2023 118.779 -17.727 – – – –
Dias et al. 2021 118.755 -17.731 0.623 -4.334 1.059 40.969
Cantat-Gaudin et al. 2020 118.762 -17.732 0.626 -4.318 1.053 –
SΓ‘nchez et al. 2020 118.775 -17.71 – -4.324 1.111 –
Donor et al. 2020 118.785 -17.73 – -4.3 1.09 41.6
Cantat-Gaudin & Anders 2020 118.762 -17.732 0.626 -4.318 1.053 –
Bica et al. 2019 118.777 -17.715 – – – –
Loktin & Popova 2017 118.77 -17.738 – -6.64 3.632 38.17
Kharchenko et al. 2016 118.779 -17.727 – – – –
Dias et al. 2014 118.775 -17.71 – -2.94 -1.33 –
Kharchenko et al. 2013 118.785 -17.73 – -7.14 4.72 –
Piskunov et al. 2008 118.763 -17.712 – – – –
Kharchenko et al. 2005 118.77 -17.71 – -0.94 1.93 –
Kharchenko et al. 2003 118.74 -17.7 – -1.89 0.57 –
Dias et al. 2002 118.775 -17.71 – -2.94 -1.33 38.17

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] Bfrac BSS
UCC 99999– 1.52 0.26 0.47 1035 -0.035 392 0.54 –
Li et al. 2025 1.56 0.24 – 1217 -0.040 – – –
Hu & Soubiran 2025 – – – – -0.150(5) – – –
Almeida et al. 2025 1.50 0.26 – 1219 – 390 – –
Hunt & Reffert 2024 – – – – – 678(1) – –
Cavallo et al. 2024 1.51 0.19 – 1349 -0.020 – – –
Hunt & Reffert 2023 1.52 0.10 0.47 1309 – – – –
Almeida et al. 2023 1.56 0.07 – 1262 0.066 395(1) 0.54 –
Just et al. 2023 – – – 1035 – 258 – –
Dias et al. 2021 1.50 0.26 – 1219 -0.104 – – –
Cantat-Gaudin et al. 2020 1.56 0.15 – 977 – – – –
Donor et al. 2020 – – – – -0.030 – – –
Cantat-Gaudin & Anders 2020 1.53 – – – – – – –
Loktin & Popova 2017 2.64 0.57 – 589 – – – –
Kharchenko et al. 2016 1.36 0.26 – 1035 – – – –
Kharchenko et al. 2013 1.36 0.26 – 1035 – – – –
Piskunov et al. 2008 1.20 0.31 – 977 – – – –
Kharchenko et al. 2005 1.20 0.31 – 977 – – – –
Kharchenko et al. 2003 1.67 0.31 – – – – – –
Dias et al. 2002 1.58 0.16 – 1000 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 226 97.9 118.77 -17.73 0.61 -4.32 1.1 40.21 0.0

πŸ’‘ Note: The % column shows the percentage of members that Trumpler 8 shares with each listed object.

Visualization
ℹ️
Trumpler 8 UCC
Trumpler 8 HUNT23
Trumpler 8 CANTAT20
Galactocentric position diagram