Melotte 28

(Collinder 57; NGC 1746; MWSC 461; OCL 452; FSR 0822)

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0.80 UTI
0.76
CN
1.0
Cdens
0.75
CC3
0.75
Clit
1.0
Cdup
N50 (P>50% members) 117
Stellar density (N50/rad) 104.4 [N/pc2]
C3 classification AB
  • CN 0.76 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.75 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Melotte 28 is a rich, very dense object of high C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is well-studied in the literature.

Note: This object shares a large percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Cantat-Gaudin et al. (2020)
Originally catalogued as a sparse cluster overlapping NGC 1750 and NGC 1758. Modern studies find no distinct third object; considered non-existent. More details in Appendix A of the article.

Data
🔍 Search references for Melotte 28 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– 76.163 23.817 1.127 3.126 -3.497 5.784
Just et al. 2023 76.131 23.83 – – – –
Bica et al. 2019 76.139 23.824 – – – –
Kharchenko et al. 2016 76.131 23.83 – – – –
Dias et al. 2014 75.958 23.77 – -1.58 -3.24 –
Kharchenko et al. 2013 76.14 23.83 – -2.13 -4.22 2.0
Gozha et al. 2012 75.958 23.77 – – – –
Kharchenko et al. 2012 76.14 23.83 – -2.13 -4.22 2.0
Piskunov et al. 2008 75.951 23.771 – – – –
Kharchenko et al. 2007 75.96 23.77 – 0.57 – 2.0
Piskunov et al. 2007 75.951 23.771 – – – –
Kharchenko et al. 2005 75.96 23.77 – -1.87 -3.07 2.0
Kharchenko et al. 2003 75.96 23.77 – -1.27 -3.87 –
Dias et al. 2002 75.958 23.77 – -1.58 -3.24 2.0

💡 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– 0.76 0.93 – 437 – 758 – –
Just et al. 2023 – – – 437 – 252 – –
Kharchenko et al. 2016 0.80 0.93 – 437 – – – –
Kharchenko et al. 2013 0.80 0.93 – 437 – – – –
Gozha et al. 2012 0.42 – – – – 776 – –
Kharchenko et al. 2012 0.80 0.93 – 442 – – – –
Piskunov et al. 2008 0.76 0.78 – 155 – 2056(1) – –
Piskunov et al. 2007 0.76 0.78 – 155 – 740 – –
Kharchenko et al. 2005 0.76 0.78 – 155 – – – –
Kharchenko et al. 2003 0.42 0.93 – – – – – –
Dias et al. 2002 0.80 0.93 – 442 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
NGC 1758 100.0 76.18 23.82 1.11 3.12 -3.48 3.55 0.93

💡 Note: The % column shows the percentage of members that Melotte 28 shares with each listed object.

Visualization
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Melotte 28 UCC
Galactocentric position diagram