Melotte 239

(Collinder 445; IC 1434; MWSC 3592; OCL 223; FSR 0343; FoF 165)

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1.0 UTI
1.0
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 666
Radius (P>50% members) 5.7 [arcmin]
  • 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
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Melotte 239 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster (see Parameters). It is very well-studied in the literature.

Note: This object shares a very small percentage of members with 2 later reported entries. See table with shared members information.

Distant Moderate extinction Massive Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Melotte 239 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 332.623 52.856 0.276 -3.879 -3.357 -62.145
Li et al. 2025 332.625 52.858 0.278 -3.904 -3.328 –
Almeida et al. 2025 332.627 52.856 – – – –
Hunt & Reffert 2024 332.625 52.862 0.28 -3.882 -3.356 -69.239
Cavallo et al. 2024 332.626 52.855 0.278 – – –
Hunt & Reffert 2023 332.625 52.862 0.28 -3.882 -3.356 -69.239
Almeida et al. 2023 332.63 52.852 – – – –
Just et al. 2023 332.597 52.856 – – – –
Dias et al. 2021 332.627 52.856 0.284 -3.919 -3.323 -60.435
Cantat-Gaudin et al. 2020 332.625 52.858 0.278 -3.904 -3.328 –
SΓ‘nchez et al. 2020 332.642 52.828 – -3.805 -3.323 –
Cantat-Gaudin & Anders 2020 332.625 52.858 0.278 -3.904 -3.328 –
Liu & Pang 2019 332.619 52.872 0.287 -3.843 -3.327 –
Soubiran et al. 2018 332.625 52.858 – – – -60.12
Bica et al. 2019 332.588 52.854 – – – –
Cantat-Gaudin et al. 2018 332.625 52.858 0.278 -3.904 -3.328 –
Loktin & Popova 2017 332.595 52.86 – -5.587 -2.617 –
Kharchenko et al. 2016 332.597 52.856 – – – –
Dias et al. 2014 332.642 52.828 – -3.06 -0.52 –
Kharchenko et al. 2013 332.602 52.86 – -6.52 -3.46 –
Kharchenko et al. 2012 332.602 52.86 – -6.52 -3.46 –
Dias et al. 2002 332.642 52.828 – -3.06 -0.52 –

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] Bfr BSS
Li et al. 2025 3.63 0.97 – 417 0.251 – – –
Almeida et al. 2025 2.80 1.41 – 131 – 1537 – –
Hunt & Reffert 2024 – – – – – 3959* – –
Cavallo et al. 2024 3.63 1.66 – 126 0.060 – – –
Hunt & Reffert 2023 3.52 1.16 2.31 293 – – – –
Almeida et al. 2023 3.02 1.45 – 131 -0.047 1432* 0.59 –
Just et al. 2023 – – – 176 – 1574 – –
Dias et al. 2021 2.80 1.41 – 131 -0.158 – – –
Cantat-Gaudin et al. 2020 3.48 0.58 – 275 – – – –
Cantat-Gaudin & Anders 2020 3.25 – – – – – – –
Liu & Pang 2019 – – – 562 0.500 – – –
Soubiran et al. 2018 3.25 – – – – – – –
Cantat-Gaudin et al. 2018 3.25 – – – – – – –
Loktin & Popova 2017 3.78 0.22 – 646 – – – –
Kharchenko et al. 2016 3.21 1.62 – 176 – – – –
Kharchenko et al. 2013 3.21 1.62 – 176 – – – –
Kharchenko et al. 2012 3.21 1.62 – 176 – – – –
Dias et al. 2002 2.60 0.40 – 794 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0162 3.8 332.68 52.9 0.31 -3.91 -3.28 – 0.0
OC 0163 3.8 332.69 52.89 0.27 -3.84 -3.34 – 0.0

πŸ’‘ Note: The % column shows the percentage of members that Melotte 239 shares with each listed object.

Visualization
ℹ️
Melotte 239 UCC
Melotte 239 HUNT23
Melotte 239 CANTAT20
Galactocentric position diagram