King 1

(MWSC 35; OCL 290; FSR 0490)

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0.95 UTI
1.0
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 1169
Radius (P>50% members) 7.8 [arcmin]
  • CN 1.0 Very 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 1 is a very rich, very dense object of 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, old 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.

Note: This object contains blue stragglers according to at least one source.

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Massive Near-solar metallicity Old Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for King 1 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 – 5.508 64.384 0.54 -4.938 -1.298 -53.106
Li et al. 2025 5.505 64.383 0.519 -4.947 -1.273 –
Hu & Soubiran 2025 5.502 64.389 – – – –
Wei et al. 2025 5.523 64.381 0.549 -4.937 -1.302 –
Carrasco-Varela et al. 2025 5.732 64.445 – – – –
Almeida et al. 2025 5.456 64.373 – – – –
Hunt & Reffert 2024 5.523 64.383 0.546 -4.936 -1.307 -49.574
Cavallo et al. 2024 5.502 64.389 0.547 – – –
Hunt & Reffert 2023 5.523 64.383 0.546 -4.936 -1.307 -49.574
Just et al. 2023 5.506 64.38 – – – –
Dias et al. 2021 5.456 64.373 0.515 -4.952 -1.279 -53.284
Cantat-Gaudin et al. 2020 5.505 64.383 0.519 -4.947 -1.273 –
Cantat-Gaudin & Anders 2020 5.505 64.383 0.519 -4.947 -1.273 –
Soubiran et al. 2018 5.505 64.383 – – – -53.2
Bica et al. 2019 5.534 64.382 – – – –
Cantat-Gaudin et al. 2018 5.505 64.383 0.519 -4.947 -1.273 –
Loktin & Popova 2017 5.52 64.381 – -2.038 -4.122 -38.4
Kharchenko et al. 2016 5.506 64.38 – – – –
Dias et al. 2014 5.517 64.381 – -2.43 1.02 –
Kharchenko et al. 2013 5.515 64.384 – -2.68 -4.31 –
Kharchenko et al. 2012 5.515 64.384 – -2.6 -4.29 –

💡 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 1.56 2.70 – 2103 -0.053 – – –
Hu & Soubiran 2025 – – – – 0.150* – – –
Wei et al. 2025 2.99 2.58 – 2630 0.000 4943 0.65 –
Carrasco-Varela et al. 2025 1.65 2.54 – 2350 -0.100 – – 0.06*
Almeida et al. 2025 1.65 2.54 – 2350 – 3888 – –
Hunt & Reffert 2024 – – – – – 4379* – –
Cavallo et al. 2024 1.75 2.93 – 1445 -0.070 – – –
Hunt & Reffert 2023 1.73 2.73 1.70 1050 – – – –
Just et al. 2023 – – – 5012 – 333 – –
Dias et al. 2021 1.65 2.54 – 2350 0.105 – – –
Cantat-Gaudin et al. 2020 1.73 1.90 – 3631 – – – –
Cantat-Gaudin & Anders 2020 1.83 – – – – – – –
Soubiran et al. 2018 1.83 – – – – – – –
Cantat-Gaudin et al. 2018 1.83 – – – – – – –
Loktin & Popova 2017 1.36 2.32 – 1479 – – – –
Kharchenko et al. 2016 1.66 1.94 – 5012 – – – –
Kharchenko et al. 2013 1.66 1.94 – 5012 – – – –
Kharchenko et al. 2012 1.66 1.94 – 5012 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
Teutsch J0022.3+6431 2.4 5.56 64.48 0.56 -4.96 -1.27 -49.4 0.0

💡 Note: The % column shows the percentage of members that King 1 shares with each listed object.

Visualization
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King 1 UCC
King 1 HUNT23
King 1 CANTAT20
Galactocentric position diagram