Melotte 39

(Collinder 78; NGC 2126; FSR 0730; MWSC 708; OCL 418)

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0.96 UTI
0.8
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 232
Stellar density (N50/rad) 20.2 [N/pc2]
C3 classification AA
  • CN 0.8 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¸
Melotte 39 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, 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 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.

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Melotte 39 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 90.662 49.88 0.756 0.813 -2.6 -12.886
Li et al. 2025 90.658 49.883 0.747 0.848 -2.615 –
Hu & Soubiran 2025 90.671 49.89 – – – –
Almeida et al. 2025 90.657 49.895 – – – –
Zhang et al. 2024 90.65 49.872 – – – –
Hunt & Reffert 2024 90.65 49.872 0.76 0.817 -2.601 -12.705
Cavallo et al. 2024 90.671 49.89 0.761 – – –
Hunt & Reffert 2023 90.65 49.872 0.76 0.817 -2.601 -12.705
Almeida et al. 2023 90.639 49.896 – – – –
Just et al. 2023 90.636 49.873 – – – –
Tarricq et al. 2022 90.638 49.883 0.759 0.822 -2.589 –
Jaehnig et al. 2021 90.655 49.879 0.78 0.863 -2.603 –
Dias et al. 2021 90.657 49.895 0.743 0.841 -2.606 -11.741
Cantat-Gaudin et al. 2020 90.658 49.883 0.747 0.848 -2.615 –
Cantat-Gaudin & Anders 2020 90.658 49.883 0.747 0.848 -2.615 –
Bica et al. 2019 90.631 49.873 – – – –
Loktin & Popova 2017 90.645 49.872 – -0.152 -0.8 –
Kharchenko et al. 2016 90.636 49.873 – – – –
Dias et al. 2014 90.621 49.918 – -0.63 -1.62 –
Kharchenko et al. 2013 90.648 49.872 – -1.38 -1.71 –
Kharchenko et al. 2012 90.648 49.872 – -1.38 -1.71 –
Froebrich et al. 2007 90.638 49.873 – – – –
Dias et al. 2002 90.621 49.918 – -0.63 -1.62 –

💡 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– 1.24 0.675 0.41 1535 -0.175 314 0.63 –
Li et al. 2025 1.20 0.69 – 1811 -0.240 – – –
Hu & Soubiran 2025 – – – – -0.210(5) – – –
Almeida et al. 2025 1.23 0.67 – 1535 – 352 – –
Zhang et al. 2024 – – – – -0.221(1) – – –
Hunt & Reffert 2024 – – – – – 610(1) – –
Cavallo et al. 2024 1.29 0.77 – 1413 0.080 – – –
Hunt & Reffert 2023 1.24 0.35 0.41 1778 – – – –
Almeida et al. 2023 1.25 0.81 – 1517 -0.141 275(1) 0.63 –
Just et al. 2023 – – – 2818 – 97 – –
Tarricq et al. 2022 1.26 – – 977 – – – –
Jaehnig et al. 2021 1.28(1) – – – – – – –
Dias et al. 2021 1.23 0.67 – 1535 0.016 – – –
Cantat-Gaudin et al. 2020 1.31 0.68 – 977 – – – –
Cantat-Gaudin & Anders 2020 1.29 – – – – – – –
Loktin & Popova 2017 2.14 0.78 – 891 – – – –
Kharchenko et al. 2016 1.10 0.16 – 2818 – – – –
Kharchenko et al. 2013 1.10 0.16 – 2818 – – – –
Kharchenko et al. 2012 1.10 0.16 – 2818 – – – –
Dias et al. 2002 1.09 0.84 – 1259 – – – –

(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 196 97.0 90.66 49.88 0.76 0.81 -2.6 -13.21 0.03

💡 Note: The % column shows the percentage of members that Melotte 39 shares with each listed object.

Visualization
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Melotte 39 UCC
Melotte 39 HUNT23
Melotte 39 CANTAT20
Galactocentric position diagram