Melotte 240

(Collinder 448; NGC 7243; MWSC 3602; OCL 221; FoF 2214)

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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) 510
Stellar density (N50/rad) 31.8 [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¸
Melotte 240 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Melotte 240 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 333.791 49.838 1.126 0.43 -2.884 -10.355
Li et al. 2025 333.788 49.83 1.116 0.433 -2.857 –
Almeida et al. 2025 333.775 49.832 – – – –
Alfonso et al. 2024 333.795 49.858 1.099 0.442 -2.888 –
Zhang et al. 2024 333.817 49.825 – – – –
Hunt & Reffert 2024 333.817 49.825 1.131 0.442 -2.892 -10.477
Cavallo et al. 2024 333.769 49.818 1.132 – – –
Hunt & Reffert 2023 333.817 49.825 1.131 0.442 -2.892 -10.477
Almeida et al. 2023 333.776 49.837 – – – –
Cordoni et al. 2023 333.775 49.832 1.118 0.432 -2.845 –
Just et al. 2023 333.789 49.872 – – – –
He et al. 2022 333.78 49.826 1.127 0.438 -2.896 –
Tarricq et al. 2022 333.753 49.795 1.128 0.444 -2.889 –
Jaehnig et al. 2021 333.749 49.807 1.148 0.448 -2.845 –
Rain et al. 2021 333.788 49.83 1.116 0.433 -2.857 –
Dias et al. 2021 333.775 49.832 1.118 0.432 -2.845 25.08
Cantat-Gaudin et al. 2020 333.788 49.83 1.116 0.433 -2.857 –
Cantat-Gaudin & Anders 2020 333.788 49.83 1.116 0.433 -2.857 –
Liu & Pang 2019 333.79 49.831 1.115 0.438 -2.846 –
Bossini et al. 2019 333.788 49.83 – – – –
Soubiran et al. 2018 333.788 49.83 – – – -2.9
Bica et al. 2019 333.81 49.879 – – – –
Cantat-Gaudin et al. 2018 333.788 49.83 1.116 0.433 -2.857 –
Loktin & Popova 2017 333.78 49.898 – -0.843 -0.316 -12.6
Kharchenko et al. 2016 333.789 49.872 – – – –
Dias et al. 2014 333.783 49.898 – -0.86 -1.71 –
Kharchenko et al. 2013 333.795 49.875 – -0.05 -1.7 -12.6
Gozha et al. 2012 333.783 49.898 – – – –
Kharchenko et al. 2012 333.795 49.875 – -0.05 -1.73 -12.61
Piskunov et al. 2008 333.771 49.898 – – – –
Kharchenko et al. 2007 333.78 49.9 – 0.52 – -12.61
Piskunov et al. 2007 333.771 49.898 – – – –
van den Bergh 2006 333.775 49.9 – – – –
Kharchenko et al. 2005 333.78 49.9 – 0.37 -2.1 -12.61
Kharchenko et al. 2003 333.82 49.88 – -0.03 -2.49 –
Chen et al. 2003 333.905 49.86 – 1.61 -2.53 -16.0
Dias et al. 2002 333.783 49.898 – -0.86 -1.71 -10.07
Dambis 1999 333.783 49.898 – – – –

💡 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– 0.85 0.68 0.63 114 0.021 962 0.345 0.0
Li et al. 2025 0.86 0.63 – 190 0.054 – – –
Almeida et al. 2025 0.85 0.83 – 130 – 827 – –
Alfonso et al. 2024 0.88 0.50 – 236 0.012 – – –
Zhang et al. 2024 – – – – -0.097(1) – – –
Hunt & Reffert 2024 – – – – – 1143(1) – –
Cavallo et al. 2024 0.88 0.80 – 98 0.240 – – –
Hunt & Reffert 2023 0.85 0.59 0.63 106 – – – –
Almeida et al. 2023 0.86 0.80 – 135 -0.004 587(1) 0.38 –
Cordoni et al. 2023 0.85 0.83 – 130 0.011 1428 0.31 0.00
Just et al. 2023 – – – 92 – 526 – –
He et al. 2022 – 0.90 – 79 – – – –
Tarricq et al. 2022 0.86 – – 151 – – – –
Jaehnig et al. 2021 0.87(1) – – – – – – –
Rain et al. 2021 0.87 0.56 – 100 – – – 0
Dias et al. 2021 0.85 0.83 – 130 0.011 – – –
Cantat-Gaudin et al. 2020 0.88 0.50 – 148 – – – –
Cantat-Gaudin & Anders 2020 0.87 – – – – – – –
Liu & Pang 2019 – – – 93 0.250 – – –
Bossini et al. 2019 0.89 0.57 – 101 0.030 – – –
Soubiran et al. 2018 0.87 – – – – – – –
Cantat-Gaudin et al. 2018 0.87 – – – – – – –
Loktin & Popova 2017 0.83 0.70 – 115 – – – –
Kharchenko et al. 2016 0.85 0.69 – 92 – – – –
Kharchenko et al. 2013 0.85 0.69 – 92 – – – –
Gozha et al. 2012 0.81 – – 114 – 1096 – –
Kharchenko et al. 2012 0.85 0.69 – 105 – – – –
Piskunov et al. 2008 0.81 0.68 – 123 – 1183(1) – –
Piskunov et al. 2007 0.81 0.68 – 123 – 395 – –
van den Bergh 2006 0.81 0.68 – 115 – – – –
Kharchenko et al. 2005 0.81 0.68 – 123 – – – –
Kharchenko et al. 2003 0.81 0.68 – – – – – –
Chen et al. 2003 0.81 – – 110 – – – –
Dias et al. 2002 0.81 0.68 – 114 0.060 – – –
Dambis 1999 0.77 0.79 – 79 – – – –

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

Visualization
ℹī¸
Melotte 240 UCC
Melotte 240 HUNT23
Melotte 240 CANTAT20
Galactocentric position diagram