NGC 6242

(Melotte 155; Collinder 317; VDBH 204; OCL 1001; vdBergh-Hagen 204; ESO 332 10; MWSC 2488; FoF 1621)

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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) 791
Stellar density (N50/rad) 103.0 [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
NGC 6242 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, young 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.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Richer et al. (2021)
The expected number of WDs is 8.9, 0 WD candidates found, and 0 WD candidates found in the wide search.

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=7.767, Av=0.988, [Fe/H]=0.00 were taken from Bossini et al. (2019A&A...623A.108B, Cat. J/A+A/623/A108). The distance d=1131.3 (dmode+01) of Cantat-Gaudin et al. (2018A&A...618A..93C, Cat. J/A+A18/A93) was use to fit the isochrone.

Ahumada & Lapasset (2007)
The apparent cluster diameter was taken from (1973A&AS...10..135M).

Data
πŸ” Search references for NGC 6242 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 253.874 -39.475 0.766 1.119 -0.865 -7.045
Li et al. 2025 253.878 -39.474 0.755 1.149 -0.825 –
Almeida et al. 2025 253.88 -39.476 – – – –
Hunt & Reffert 2024 253.878 -39.466 0.772 1.107 -0.858 -5.187
Cavallo et al. 2024 253.869 -39.485 0.771 – – –
Hunt & Reffert 2023 253.878 -39.466 0.772 1.107 -0.858 -5.187
Almeida et al. 2023 253.844 -39.473 – – – –
Angelo et al. 2023 253.9 -39.479 – 1.11 -0.88 –
Cordoni et al. 2023 253.88 -39.476 0.752 1.16 -0.817 –
Tarricq et al. 2022 253.868 -39.472 0.757 1.112 -0.872 –
Jaehnig et al. 2021 253.883 -39.464 0.785 1.144 -0.84 –
Rain et al. 2021 253.878 -39.474 0.755 1.149 -0.825 –
Richer et al. 2021 253.885 -39.466 0.77 1.142 -0.844 –
Dias et al. 2021 253.88 -39.476 0.752 1.16 -0.817 –
Spina et al. 2021 253.879 -39.474 0.756 1.156 -0.835 –
Cantat-Gaudin et al. 2020 253.878 -39.474 0.755 1.149 -0.825 –
SΓ‘nchez et al. 2020 253.887 -39.462 – 1.118 -1.023 –
Cantat-Gaudin & Anders 2020 253.878 -39.474 0.755 1.149 -0.825 –
Liu & Pang 2019 253.887 -39.484 0.786 1.153 -0.834 –
Bossini et al. 2019 253.878 -39.474 – – – –
Soubiran et al. 2018 253.878 -39.474 – – – -7.03
Bica et al. 2019 253.886 -39.472 – – – –
Cantat-Gaudin et al. 2018 253.878 -39.474 0.755 1.149 -0.825 –
Loktin & Popova 2017 253.89 -39.463 – -2.927 0.266 -7.1
Dias et al. 2014 253.887 -39.462 – -0.05 -0.42 –
Bukowiecki et al. 2011 253.875 -39.47 – – – –
Piskunov et al. 2008 253.884 -39.458 – – – –
Piskunov et al. 2007 253.884 -39.458 – – – –
Ahumada & Lapasset 2007 253.875 -39.467 – – – –
van den Bergh 2006 253.9 -39.467 – – – –
Kharchenko et al. 2005 253.89 -39.46 – 0.63 -0.26 –
Kharchenko et al. 2003 253.87 -39.47 – 0.38 -0.19 –
Dias et al. 2002 253.887 -39.462 – -0.05 -0.42 -7.1
Dambis 1999 253.9 -39.467 – – – –
Lynga 1987 253.917 -39.491 – – – –
van den Bergh & Hagen 1975 253.05 -39.417 – – – –
Sulentic et al. 1973 253.906 -39.489 – – – –

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– 1.18 1.215 0.56 58 0.017 1168 0.4 0
Li et al. 2025 1.10 1.28 – 67 -0.145 – – –
Almeida et al. 2025 1.17 1.36 – 59 – 1613 – –
Hunt & Reffert 2024 – – – – – 2974(1) – –
Cavallo et al. 2024 1.26 1.26 – 107 0.310 – – –
Hunt & Reffert 2023 1.22 1.23 0.56 79 – – – –
Almeida et al. 2023 1.22 1.37 – 68 0.126 1529(1) 0.48 –
Angelo et al. 2023 1.12 1.55 – 50 0.000 2(1) – –
Cordoni et al. 2023 1.17 1.36 – 59 0.034 3916 0.32 0(1)
Tarricq et al. 2022 1.21 – – 83 – – – –
Jaehnig et al. 2021 1.27(1) – – – – – – –
Rain et al. 2021 1.28 0.98 – 58 – – – 0
Richer et al. 2021 – 1.27 – 78 – – – –
Dias et al. 2021 1.17 1.36 – 59 0.034 – – –
Spina et al. 2021 1.33 – – 78 – – – –
Cantat-Gaudin et al. 2020 1.25 1.03 – 78 – – – –
Kounkel et al. 2020 1.29 1.33 – 68 – – – –
Cantat-Gaudin & Anders 2020 1.28 – – – – – – –
Liu & Pang 2019 – – – 32 -0.250 – – –
Bossini et al. 2019 1.19 0.99 – 58 0.000 – – –
Soubiran et al. 2018 1.28 – – – – – – –
Cantat-Gaudin et al. 2018 1.28 – – – – – – –
Loktin & Popova 2017 1.14 1.19 – 40 – – – –
Bukowiecki et al. 2012 – – – – – 702 – –
Bukowiecki et al. 2011 1.17(1) 1.23 – 32 – – – –
Piskunov et al. 2008 1.13 1.20 – 43 – 807(1) – –
Piskunov et al. 2007 1.13 1.20 – 43 – 229 – –
Ahumada & Lapasset 2007 – 1.20 – 41 – – – 0
van den Bergh 2006 1.13 1.20 – 41 – – – –
Kharchenko et al. 2005 1.13 1.20 – 43 – – – –
Kharchenko et al. 2003 1.13 1.20 – – – – – –
Dias et al. 2002 1.13 1.19 – 41 – – – –
Dambis 1999 1.02 1.23 – 63 – – – –
Lynga 1987 1.20 1.17 – 51 – – – –

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

Visualization
ℹ️
NGC 6242 UCC
NGC 6242 HUNT23
NGC 6242 CANTAT20
Galactocentric position diagram