Melotte 204

(Collinder 382; IC 4725; MWSC 2940; M 25; OCL 38; ESO 591 06; FoF 2292)

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0.98 UTI
0.9
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 487
Radius (P>50% members) 15.0 [arcmin]
  • CN 0.9 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 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Melotte 204 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, young cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.
Close Moderate extinction Massive Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Melotte 204 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 277.938 -19.117 1.512 -1.687 -6.143 2.392
Li et al. 2025 277.937 -19.114 1.514 -1.688 -6.117 –
Wei et al. 2025 277.955 -19.122 1.513 -1.686 -6.163 –
Almeida et al. 2025 277.938 -19.112 – – – –
Alfonso et al. 2024 277.944 -19.119 1.475 -1.686 -6.156 –
Hunt & Reffert 2024 277.942 -19.131 1.512 -1.692 -6.165 2.015
Cavallo et al. 2024 277.949 -19.122 1.512 – – –
Hunt & Reffert 2023 277.942 -19.131 1.512 -1.692 -6.165 2.015
Cordoni et al. 2023 277.938 -19.112 1.513 -1.687 -6.112 –
Just et al. 2023 277.92 -19.111 – – – –
He et al. 2022 277.947 -19.127 1.515 -1.687 -6.15 –
Tarricq et al. 2022 277.93 -19.125 1.513 -1.694 -6.141 –
Jaehnig et al. 2021 277.962 -19.101 1.541 -1.663 -6.102 –
Rain et al. 2021 277.937 -19.114 1.514 -1.688 -6.117 –
Dias et al. 2021 277.938 -19.112 1.513 -1.687 -6.112 10.314
Cantat-Gaudin et al. 2020 277.937 -19.114 1.514 -1.688 -6.117 –
Cantat-Gaudin & Anders 2020 277.937 -19.114 1.514 -1.688 -6.117 –
Liu & Pang 2019 277.954 -19.103 1.511 -1.696 -6.124 –
Bossini et al. 2019 277.937 -19.114 – – – –
Soubiran et al. 2018 277.937 -19.114 – – – 3.09
Bica et al. 2019 277.936 -19.126 – – – –
Cantat-Gaudin et al. 2018 277.937 -19.114 1.514 -1.688 -6.117 –
Loktin & Popova 2017 277.95 -19.118 – -4.01 -5.7 -1.8
Kharchenko et al. 2016 277.92 -19.111 – – – –
Dias et al. 2014 277.946 -19.117 – -2.54 -3.99 –
Kharchenko et al. 2013 277.927 -19.11 – -2.2 -6.09 -1.8
Gozha et al. 2012 277.946 -19.117 – – – –
Piskunov et al. 2008 277.913 -19.126 – – – –
Kharchenko et al. 2007 277.95 -19.12 – 0.6 – -1.81
Piskunov et al. 2007 277.913 -19.126 – – – –
van den Bergh 2006 277.925 -19.117 – – – –
Kharchenko et al. 2005 277.92 -19.12 – -2.73 -4.95 -1.81
Kharchenko et al. 2003 277.86 -19.16 – -3.37 -5.73 –
Chen et al. 2003 277.95 -19.177 – -2.78 -6.15 3.0
Dias et al. 2002 277.946 -19.117 – -4.01 -5.7 2.4
Dambis 1999 277.946 -19.117 – – – –

💡 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] Bfr BSS
Li et al. 2025 0.59 1.25 – 116 -0.054 – – –
Wei et al. 2025 1.10 1.64 – 66 0.000 1694 0.46 –
Almeida et al. 2025 0.64 1.36 – 167 – 1254 – –
Alfonso et al. 2024 0.70 0.84 – 462 0.172 – – –
Hunt & Reffert 2024 – – – – – 2248* – –
Cavallo et al. 2024 0.65 1.36 – 170 0.360 – – –
Hunt & Reffert 2023 0.62 1.36 1.57 96 – – – –
Cordoni et al. 2023 0.64 1.36 – 167 0.169 1268 0.25 0.00
Just et al. 2023 – – – 93 – 57 – –
He et al. 2022 – 1.65 – 79 – – – –
Tarricq et al. 2022 0.69 – – 112 – – – –
Jaehnig et al. 2021 0.65* – – – – – – –
Rain et al. 2021 0.65 1.08 – 95 – – – 0
Dias et al. 2021 0.64 1.36 – 167 0.169 – – –
Cantat-Gaudin et al. 2020 0.70 0.84 – 112 – – – –
Cantat-Gaudin & Anders 2020 0.65 – – – – – – –
Liu & Pang 2019 – – – 68 -0.250 – – –
Bossini et al. 2019 0.68 1.09 – 96 0.000 – – –
Soubiran et al. 2018 0.65 – – – – – – –
Cantat-Gaudin et al. 2018 0.65 – – – – – – –
Loktin & Popova 2017 0.62 1.47 – 92 – – – –
Kharchenko et al. 2016 0.56 1.48 – 93 – – – –
Kharchenko et al. 2013 0.56 1.48 – 93 -0.257 – – –
Gozha et al. 2012 0.62 – – 92 0.170 1096 – –
Piskunov et al. 2008 0.62 1.40 – 68 – 1486* – –
Piskunov et al. 2007 0.62 1.40 – 68 – 475 – –
van den Bergh 2006 0.62 1.49 – 91 – – – –
Kharchenko et al. 2005 0.62 1.40 – 68 – – – –
Kharchenko et al. 2003 0.62 1.46 – – – – – –
Chen et al. 2003 0.62 1.48 – 90 0.170* – – –
Dias et al. 2002 0.62 1.48 – 92 0.170 – – –
Dambis 1999 0.53 1.50 – 40 – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization
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Melotte 204 UCC
Melotte 204 HUNT23
Melotte 204 CANTAT20
Galactocentric position diagram