Melotte 32

(Collinder 61; NGC 1857; MWSC 505; OCL 428; FSR 0755)

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0.94 UTI
0.82
CN
1.0
Cdens
1.0
CC3
1.0
Clit
0.98
Cdup
N50 (P>50% members) 290
Stellar density (N50/rad) 18.2 [N/pc2]
C3 classification AA
  • CN 0.82 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 0.98 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Melotte 32 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate 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.

Note: This is a unique object, which shares a very small percentage of members with at least one previously reported entry. See table with shared members information.

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Melotte 32 in: SciX Simbad
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Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 80.03 39.332 0.336 0.481 -1.375 -0.301
Almeida et al. 2025 80.032 39.337 – – – –
Zhang et al. 2024 80.029 39.329 – – – –
Hunt & Reffert 2024 80.029 39.329 0.331 0.47 -1.384 -3.071
Cavallo et al. 2024 80.028 39.337 0.331 – – –
Hunt & Reffert 2023 80.029 39.329 0.331 0.47 -1.384 -3.071
Almeida et al. 2023 80.034 39.334 – – – –
Just et al. 2023 80.005 39.29 – – – –
Dias et al. 2021 80.032 39.337 0.319 0.565 -1.31 0.417
Cantat-Gaudin et al. 2020 80.031 39.336 0.32 0.553 -1.31 –
Donor et al. 2020 80.014 39.29 – 0.75 -1.2 1.3
Cantat-Gaudin & Anders 2020 80.031 39.336 0.32 0.553 -1.31 –
Soubiran et al. 2018 80.031 39.336 – – – 0.49
Bica et al. 2019 80.029 39.34 – – – –
Cantat-Gaudin et al. 2018 80.031 39.336 0.32 0.553 -1.31 –
Loktin & Popova 2017 80.025 39.343 – -1.065 -0.21 –
Kharchenko et al. 2016 80.005 39.29 – – – –
Dias et al. 2014 80.025 39.343 – -1.94 -3.84 –
Kharchenko et al. 2013 80.014 39.29 – -4.73 -0.55 –
Kharchenko et al. 2012 80.014 39.29 – -4.73 -0.55 –
Dias et al. 2002 80.025 39.343 – -1.94 -3.84 –

💡 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– 2.87 1.55 0.42 294 -0.132 808 0.56 –
Almeida et al. 2025 2.43 1.70 – 269 – 586 – –
Zhang et al. 2024 – – – – -0.078(1) – – –
Hunt & Reffert 2024 – – – – – 1409(1) – –
Cavallo et al. 2024 2.72 1.51 – 263 0.180 – – –
Hunt & Reffert 2023 2.75 1.27 0.42 207 – – – –
Almeida et al. 2023 2.51 1.67 – 273 -0.123 732(1) 0.56 –
Just et al. 2023 – – – 468 – 883 – –
Dias et al. 2021 2.43 1.70 – 269 -0.199 – – –
Cantat-Gaudin et al. 2020 2.90 1.38 – 251 – – – –
Donor et al. 2020 – – – – -0.140 – – –
Cantat-Gaudin & Anders 2020 2.87 – – – – – – –
Soubiran et al. 2018 2.87 – – – – – – –
Cantat-Gaudin et al. 2018 2.87 – – – – – – –
Loktin & Popova 2017 3.51 0.87 – 575 – – – –
Kharchenko et al. 2016 3.30 1.55 – 468 – – – –
Kharchenko et al. 2013 3.30 1.55 – 468 – – – –
Kharchenko et al. 2012 3.30 1.55 – 468 – – – –
Dias et al. 2002 2.49 1.46 – 316 -0.360 – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
Teutsch 88 5.2 80.12 39.54 0.29 0.53 -1.58 31.26 0.08
Czernik 20 2.4 80.12 39.54 0.27 0.56 -1.59 31.08 0.85

💡 Note: The % column shows the percentage of members that Melotte 32 shares with each listed object.

Visualization
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Melotte 32 UCC
Melotte 32 HUNT23
Melotte 32 CANTAT20
Galactocentric position diagram