Melotte 138

(Collinder 294; VDBH 179; NGC 6005; MWSC 2336; OCL 945; vdBergh-Hagen 179; ESO 178 03; FSR 1704; FoF 67)

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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) 646
Stellar density (N50/rad) 77.0 [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
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Melotte 138 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, 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 contains blue stragglers according to at least one source.

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Melotte 138 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 238.954 -57.436 0.372 -4.037 -3.817 -24.69
Li et al. 2025 238.955 -57.439 0.362 -4.011 -3.81 –
Hu & Soubiran 2025 238.959 -57.441 – – – –
Wei et al. 2025 238.957 -57.436 0.375 -4.034 -3.819 –
Almeida et al. 2025 238.959 -57.442 – – – –
Hunt & Reffert 2024 238.951 -57.435 0.387 -4.036 -3.814 -20.293
Cavallo et al. 2024 238.959 -57.441 0.385 – – –
Hunt & Reffert 2023 238.951 -57.435 0.387 -4.036 -3.814 -20.293
Just et al. 2023 238.983 -57.439 – – – –
Jaehnig et al. 2021 238.953 -57.439 0.391 -4.021 -3.824 –
Rain et al. 2021 238.955 -57.439 0.362 -4.011 -3.81 –
Dias et al. 2021 238.959 -57.442 0.365 -4.019 -3.801 -24.365
Cantat-Gaudin et al. 2020 238.955 -57.439 0.362 -4.011 -3.81 –
SΓ‘nchez et al. 2020 238.95 -57.437 – -4.079 -3.76 –
Cantat-Gaudin & Anders 2020 238.955 -57.439 0.362 -4.011 -3.81 –
Liu & Pang 2019 238.95 -57.44 0.342 -4.02 -3.806 –
Bossini et al. 2019 238.955 -57.439 – – – –
Soubiran et al. 2018 238.955 -57.439 – – – -25.58
Bica et al. 2019 238.943 -57.432 – – – –
Cantat-Gaudin et al. 2018 238.955 -57.439 0.362 -4.011 -3.81 –
Kharchenko et al. 2016 238.983 -57.439 – – – –
Dias et al. 2014 238.95 -57.437 – -0.2 -4.09 –
Kharchenko et al. 2013 238.995 -57.44 – 12.12 13.26 –
van den Bergh 2006 239.002 -57.452 – – – –
Dias et al. 2002 238.95 -57.437 – -0.26 -4.06 -25.2

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] Bfrac BSS
UCC 99999– 2.56 1.63 0.61 1148 0.000 2143 0.47 3.0
Li et al. 2025 2.49 1.63 – 1059 0.242 – – –
Hu & Soubiran 2025 – – – – -0.140(5) – – –
Wei et al. 2025 4.17 1.80 – 1260 0.000 2473 0.47 –
Almeida et al. 2025 2.24 1.91 – 1104 – 1813 – –
Hunt & Reffert 2024 – – – – – 4405(1) – –
Cavallo et al. 2024 2.05 1.63 – 1318 0.190 – – –
Hunt & Reffert 2023 2.42 1.73 0.61 857 – – – –
Just et al. 2023 – – – 1148 – 308 – –
Jaehnig et al. 2021 2.56(1) – – – – – – –
Rain et al. 2021 2.56 1.40 – 1202 – – – 3
Dias et al. 2021 2.24 1.91 – 1104 -0.101 – – –
Cantat-Gaudin et al. 2020 2.39 1.42 – 1259 – – – –
Cantat-Gaudin & Anders 2020 2.56 – – – – – – –
Liu & Pang 2019 – – – 1450 -0.250 – – –
Bossini et al. 2019 2.60 1.36 – 973 0.160 – – –
Soubiran et al. 2018 2.56 – – – – – – –
Cantat-Gaudin et al. 2018 2.56 – – – – – – –
Kharchenko et al. 2016 1.80 2.13 – 1148 – – – –
Kharchenko et al. 2013 1.80 2.13 – 1148 – – – –
van den Bergh 2006 2.69 1.40 – 1202 – – – –
Dias et al. 2002 2.69 1.40 – 1202 – – – –

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

Visualization
ℹ️
Melotte 138 UCC
Melotte 138 HUNT23
Melotte 138 CANTAT20
Galactocentric position diagram