Melotte 73

(Collinder 157; NGC 2432; FSR 1267; MWSC 1310; OCL 620; ESO 560 06; FoF 378)

Click to load Aladin Lite
0.92 UTI
0.83
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
Radius (P>50% members) 4.4 [arcmin]
  • CN 0.83 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique

Overview

Melotte 73 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, above 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 and mass parameters (see Parameters). It is very well-studied in the literature.
Relatively close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024): Gold sample.

Data

Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 115.223 -19.076 0.524 -0.689 1.622 49.641
Hu & Soubiran 2025 115.229 -19.085
Almeida et al. 2025 115.222 -19.086
Hunt & Reffert 2024 115.22 -19.075 0.512 -0.691 1.631 44.935
Cavallo et al. 2024 115.229 -19.085 0.52
Hunt & Reffert 2023 115.22 -19.075 0.512 -0.691 1.631 44.935
Just et al. 2023 115.219 -19.083
Dias et al. 2021 115.222 -19.086 0.493 -0.69 1.611 51.48
Cantat-Gaudin et al. 2020 115.223 -19.078 0.493 -0.684 1.614
Liu & Pang 2019 115.218 -19.084 0.498 -0.725 1.616
Bossini et al. 2019 115.223 -19.078
Soubiran et al. 2018 115.223 -19.078 51.63
Bica et al. 2019 115.217 -19.066
Cantat-Gaudin et al. 2018 115.223 -19.078 0.493 -0.684 1.614
Loktin & Popova 2017 115.23 -19.082 -3.128 4.184 14.4
Kharchenko et al. 2016 115.219 -19.083
Kharchenko et al. 2013 115.225 -19.085 -2.65 3.62 14.4
Piskunov et al. 2008 115.316 -19.151
Kharchenko et al. 2007 115.21 -19.08 0.2 14.4
Froebrich et al. 2007 115.237 -19.073
Kharchenko et al. 2005 115.32 -19.15 -3.68 1.62 14.4
Kharchenko et al. 2003 115.29 -19.12 -5.64 1.27
Dias et al. 2002 115.221 -19.077 -0.85 1.42 14.4

💡 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
Hu & Soubiran 2025 -0.140*
Almeida et al. 2025 1.65 0.73 935 640
Hunt & Reffert 2024 1101*
Cavallo et al. 2024 1.96 0.97 776 0.160
Hunt & Reffert 2023 1.75 0.43 1.02 975
Just et al. 2023 447 140
Dias et al. 2021 1.65 0.73 935 0.014
Cantat-Gaudin et al. 2020 1.91 0.72 692
Liu & Pang 2019 955 0.000
Bossini et al. 2019 1.98 0.74 705 0.000
Soubiran et al. 2018 1.92
Cantat-Gaudin et al. 2018 1.92
Loktin & Popova 2017 2.47 0.06 851
Kharchenko et al. 2016 1.59 0.90 447
Kharchenko et al. 2013 1.59 0.90 447
Piskunov et al. 2008 2.03 0.37 151
Kharchenko et al. 2005 2.03 0.37 151
Kharchenko et al. 2003 1.91 0.71
Dias et al. 2002 1.90 0.71 501

💡 Note: The parameters are sometimes transformed from their original values to match the format of the columns shown here, see FAQ. The columns DAv, Bfr, BSS correspond to differential extinction, binary fraction, and blue stragglers, respectively. BSS values can be listed as fractions or integers.
(*): indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

Galactocentric position diagram

💡 Note: How are the galactocentric plots generated? See FAQ.