King 21

(MWSC 3762; OCL 270)

Click to load Aladin Lite
0.91 UTI
0.78
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 184
Radius (P>50% members) 2.0 [arcmin]
  • CN 0.78 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
King 21 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a 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.

Note: This object shares a small percentage of members with 2 later reported entries. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for King 21 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 357.485 62.704 0.317 -3.238 -1.713 -78.273
Almeida et al. 2025 357.473 62.707 – – – –
Hunt & Reffert 2024 357.477 62.7 0.319 -3.231 -1.717 -78.265
Cavallo et al. 2024 357.494 62.708 0.319 – – –
Hunt & Reffert 2023 357.477 62.7 0.319 -3.231 -1.717 -78.265
Almeida et al. 2023 357.481 62.705 – – – –
Just et al. 2023 357.455 62.697 – – – –
Dias et al. 2021 357.473 62.707 0.307 -3.257 -1.661 –
Cantat-Gaudin et al. 2020 357.479 62.705 0.305 -3.259 -1.675 –
SΓ‘nchez et al. 2020 357.475 62.717 – -3.044 -1.848 –
Cantat-Gaudin & Anders 2020 357.479 62.705 0.305 -3.259 -1.675 –
Bica et al. 2019 357.447 62.701 – – – –
Cantat-Gaudin et al. 2018 357.479 62.705 0.305 -3.259 -1.675 –
Loktin & Popova 2017 357.48 62.718 – -1.051 -4.543 –
Kharchenko et al. 2016 357.455 62.697 – – – –
Dias et al. 2014 357.475 62.717 – 0.72 0.77 –
Kharchenko et al. 2013 357.465 62.7 – -2.33 -4.11 –
Kharchenko et al. 2012 357.465 62.7 – -2.33 -4.11 –
van den Bergh 2006 357.475 62.717 – – – –
Dias et al. 2002 357.475 62.717 – 0.72 0.77 –

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] Bfr BSS
Almeida et al. 2025 2.59 2.38 – 47 – 632 – –
Hunt & Reffert 2024 – – – – – 1533* – –
Cavallo et al. 2024 3.47 2.62 – 56 0.540 – – –
Hunt & Reffert 2023 2.89 2.56 1.58 52 – – – –
Almeida et al. 2023 2.81 2.60 – 16 -0.114 1078* 0.57 –
Just et al. 2023 – – – 63 – 135 – –
Dias et al. 2021 2.59 2.38 – 47 0.028 – – –
Cantat-Gaudin et al. 2020 3.01 2.03 – 98 – – – –
Cantat-Gaudin & Anders 2020 2.99 – – – – – – –
Cantat-Gaudin et al. 2018 2.99 – – – – – – –
Loktin & Popova 2017 2.13 2.65 – 16 – – – –
Kharchenko et al. 2016 2.10 2.48 – 63 – – – –
Kharchenko et al. 2013 2.10 2.48 – 63 – – – –
Kharchenko et al. 2012 2.10 2.48 – 63 – – – –
van den Bergh 2006 2.10 2.76 – 14 – – – –
Dias et al. 2002 2.10 2.75 – 15 0.060 – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0212 13.6 357.48 62.71 0.34 -3.26 -1.7 – 0.0
CWWDL 10426 1.1 357.55 62.97 0.32 -3.04 -1.36 -89.18 0.11

πŸ’‘ Note: The % column shows the percentage of members that King 21 shares with each listed object.

Visualization
ℹ️
King 21 UCC
King 21 HUNT23
King 21 CANTAT20
Galactocentric position diagram