A Gaia based photometric and kinematic analysis of the old open cluster
  King 11
  This paper presents an investigation of an old age open cluster King 11 using
Gaia's Early Data Release 3 (EDR3) data. Considering the stars with membership
probability ($P_{\mu}$) $> 90\%$, we identified 676 most probable cluster
members within the cluster's limiting radius. The mean proper motion (PM) for
King 11 is determined as: $\mu_{x}=-3.391\pm0.006$ and $\mu_{y}=-0.660\pm0.004$
mas yr$^{-1}$. The blue straggler stars (BSS) of King 11 show a centrally
concentrated radial distribution. The values of limiting radius, age, and
distance are determined as 18.51 arcmin, 3.63$\pm$0.42 Gyr and $3.33\pm0.15$
kpc, respectively. The cluster's apex coordinates ($A=267.84^{\circ} \pm
1.01^{\circ}$, $D=-27.48^{\circ} \pm 1.03^{\circ}$) are determined using the
apex diagram (AD) method and verified using the ($\mu_U$,$\mu_T$) diagram. We
also obtained the orbit that the cluster follows in the Galaxy and estimated
its tentative birthplace in the disk. The resulting spatial velocity of King 11
is 60.2 $\pm$ 2.16 km s$^{-1}$. A significant oscillation along the
$Z$-coordinate up to 0.556$\pm$0.022~kpc is determined.
