King 8

(MWSC 675; OCL 448)

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0.91 UTI
0.8
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 240
Core radius and density 1.4 [pc], 9.7 [pc-2]
C3 classification AB
  • 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 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
King 8 is a rich, very dense object of high C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.

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

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.89 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.89 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.146, e_all=0.4115.

Ahumada & Lapasset (2007)
Star 105 (sp. F3V) belongs to the field according to (1984ApJ...286..552C). Star 8 could not be identified in the chart.

Data
🔍 Search references for King 8 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 87.324 33.633 0.172 0.472 -1.706 -1.832
Otto et al. 2026 87.327 33.635 – 0.52 -1.74 -1.0
Li et al. 2025 87.324 33.633 0.131 0.52 -1.743 –
Guerco et al. 2025 87.2 33.8 0.18 0.35 -2.15 -1.12
Hu & Soubiran 2025 87.321 33.629 – – – –
Almeida et al. 2025 87.327 33.633 – – – –
Hunt & Reffert 2024 87.327 33.635 0.177 0.458 -1.704 1.595
Cavallo et al. 2024 87.321 33.629 0.174 – – –
Hunt & Reffert 2023 87.327 33.635 0.177 0.458 -1.704 1.595
Just et al. 2023 87.318 33.631 – – – –
Jadhav & Subramaniam 2021 87.324 33.633 – – – –
Jaehnig et al. 2021 87.325 33.633 0.143 0.48 -1.747 –
Rain et al. 2021 87.324 33.633 0.131 0.52 -1.743 –
Dias et al. 2021 87.327 33.633 0.129 0.53 -1.754 –
Spina et al. 2021 87.324 33.633 0.114 0.525 -1.757 –
Cantat-Gaudin et al. 2020 87.324 33.633 0.131 0.52 -1.743 –
Donor et al. 2020 87.327 33.63 – 0.89 -1.47 -0.9
Zhong et al. 2020 87.324 33.633 – 0.52 -1.743 83.661
Cantat-Gaudin & Anders 2020 87.324 33.633 0.131 0.52 -1.743 –
Soubiran et al. 2018 87.324 33.633 – – – 22.8
Bica et al. 2019 87.321 33.636 – – – –
Cantat-Gaudin et al. 2018 87.324 33.633 0.131 0.52 -1.743 –
Loktin & Popova 2017 87.33 33.634 – 0.538 -1.423 -1.0
Sampedro et al. 2017 87.35 33.633 – 3.18 -3.75 –
Kharchenko et al. 2016 87.318 33.631 – – – –
Netopil et al. 2016 87.327 33.63 – – – –
Dias et al. 2014 87.35 33.633 – 2.58 -4.04 –
Kharchenko et al. 2013 87.327 33.63 – 0.78 -3.99 -1.0
Gozha et al. 2012 87.35 33.633 – – – –
Kharchenko et al. 2012 87.327 33.63 – 0.78 -3.99 -1.0
Bukowiecki et al. 2011 87.329 33.64 – – – –
Glushkova et al. 2010 87.329 33.627 – – – –
Kharchenko et al. 2007 87.34 33.63 – 0.03 – –
Ahumada & Lapasset 2007 87.35 33.633 – – – –
van den Bergh 2006 87.35 33.633 – – – –
Chen et al. 2003 87.348 33.638 – – – –
Dias et al. 2002 87.35 33.633 – 2.58 -4.04 -1.0
Lynga 1987 87.354 33.629 – – – 0.0

💡 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– 5.365 1.865 2.08 822 -0.300 1517 – 3
Otto et al. 2026 – – – 832 -0.220(15) – – –
Li et al. 2025 4.58 2.05 – 925 -0.151 – – –
Guerco et al. 2025 – – – 830 -0.180 – – –
Hu & Soubiran 2025 – – – – -0.300(5) – – –
Almeida et al. 2025 3.94 1.90 – 822 – 868 – –
Hunt & Reffert 2024 5.21 2.10 2.08 502 – 1770(1) – –
Cavallo et al. 2024 3.73 1.77 – 1072 0.110 – – –
Hunt & Reffert 2023 5.21 2.10 2.08 502 – – – –
Just et al. 2023 – – – 1012 – 813 – –
Spina et al. 2022 – – – – -0.160 – – –
Jadhav & Subramaniam 2021 5.52 1.38 – 832 – 1517 – 0(1)
Jaehnig et al. 2021 6.80(1) – – – – – – –
Rain et al. 2021 6.24 1.83 – 407 – – – 3
Dias et al. 2021 3.94 1.90 – 822 0.074 – – –
Spina et al. 2021 5.11 – – 832 – – – –
Cantat-Gaudin et al. 2020 5.52 1.38 – 832 – – – –
Kounkel et al. 2020 4.47 1.78 – 759 – – – –
Donor et al. 2020 – – – – -0.160 – – –
Zhong et al. 2020 6.24(1) 1.99 – 9005 -0.325 – – –
Cantat-Gaudin & Anders 2020 6.24 – – – – – – –
Soubiran et al. 2018 6.24 – – – – – – –
Cantat-Gaudin et al. 2018 6.24 – – – – – – –
Loktin & Popova 2017 6.80 1.78 – 401 – – – –
Kharchenko et al. 2016 4.50 1.99 – 1012 – – – –
Netopil et al. 2016 12.30 – – 620 – – – –
Kharchenko et al. 2013 4.50 1.99 – 1012 -0.460 – – –
Bukowiecki et al. 2012 – – – – – 3167 – –
Gozha et al. 2012 6.40 – – 415 -0.460 – – –
Kharchenko et al. 2012 4.50 1.99 – 1012 -0.460 – – –
Bukowiecki et al. 2011 4.82(1) 2.30 – 501 – – – –
Glushkova et al. 2010 3.10 1.39 – 1122 – – – –
Ahumada & Lapasset 2007 – 1.83 – 417 – – – 5
van den Bergh 2006 6.40 1.83 – 417 – – – –
Chen et al. 2003 6.40 1.83 – 410 -0.460(1) – – –
Dias et al. 2002 6.40 1.83 – 415 -0.460 – – –
Lynga 1987 3.50 2.62 – 794 -0.500 – – –

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

Visualization
ℹī¸
King 8 UCC
King 8 HUNT23
King 8 CANTAT20
Galactocentric position diagram