King 18

(MWSC 3669; OCL 247; FSR 0392; FoF 1312)

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0.91 UTI
0.8
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 228
Radius (P>50% members) 3.8 [arcmin]
  • CN 0.8 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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King 18 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, near 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 age and mass parameters (see Parameters). It is very well-studied in the literature.
Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for King 18 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 – 343.045 58.29 0.31 -2.632 -2.097 -62.037
Li et al. 2025 343.055 58.289 0.31 -2.639 -2.068 –
Almeida et al. 2025 343.052 58.291 – – – –
Hunt & Reffert 2024 343.05 58.292 0.325 -2.62 -2.095 -29.786
Cavallo et al. 2024 343.042 58.288 0.324 – – –
Hunt & Reffert 2023 343.05 58.292 0.325 -2.62 -2.095 -29.786
Almeida et al. 2023 343.038 58.302 – – – –
Just et al. 2023 343.016 58.294 – – – –
Dias et al. 2021 343.052 58.291 0.311 -2.631 -2.069 -62.151
Cantat-Gaudin et al. 2020 343.055 58.289 0.31 -2.639 -2.068 –
Cantat-Gaudin & Anders 2020 343.055 58.289 0.31 -2.639 -2.068 –
Liu & Pang 2019 343.037 58.292 0.34 -2.707 -2.075 –
Soubiran et al. 2018 343.055 58.289 – – – -62.2
Bica et al. 2019 343.029 58.307 – – – –
Cantat-Gaudin et al. 2018 343.055 58.289 0.31 -2.639 -2.068 –
Loktin & Popova 2017 343.02 58.298 – -2.815 2.243 –
Kharchenko et al. 2016 343.016 58.294 – – – –
Dias et al. 2014 343.004 58.293 – -2.35 -2.52 –
Kharchenko et al. 2013 343.023 58.298 – -2.91 3.18 –
Kharchenko et al. 2012 343.023 58.298 – -2.91 3.18 –
Dias et al. 2002 343.004 58.293 – -2.35 -2.52 –

💡 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
Li et al. 2025 2.49 1.86 – 544 -0.035 – – –
Almeida et al. 2025 2.37 2.10 – 243 – 352 – –
Hunt & Reffert 2024 – – – – – 964* – –
Cavallo et al. 2024 2.79 2.36 – 117 0.090 – – –
Hunt & Reffert 2023 2.87 1.99 1.61 198 – – – –
Almeida et al. 2023 2.50 2.10 – 254 -0.090 718* 0.65 –
Just et al. 2023 – – – 335 – 143 – –
Dias et al. 2021 2.37 2.10 – 243 -0.083 – – –
Cantat-Gaudin et al. 2020 3.15 1.96 – 43 – – – –
Cantat-Gaudin & Anders 2020 2.95 – – – – – – –
Liu & Pang 2019 – – – 692 0.500 – – –
Soubiran et al. 2018 2.95 – – – – – – –
Cantat-Gaudin et al. 2018 2.95 – – – – – – –
Loktin & Popova 2017 2.75 1.24 – 603 – – – –
Kharchenko et al. 2016 2.55 1.86 – 335 – – – –
Kharchenko et al. 2013 2.55 1.86 – 335 – – – –
Kharchenko et al. 2012 2.55 1.86 – 335 – – – –
Dias et al. 2002 3.01 2.14 – 126 – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization
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King 18 UCC
King 18 HUNT23
King 18 CANTAT20
Galactocentric position diagram