Object: Open cluster KING 21 Constell: CAS RA: 23h 49.9m Decl: +62° 43' Epoch: 2000 Mag: 9.8m Size: 2.5' Type: III 3 m Observer: Jere Kahanpää Obs. place: Hartola, Finland Date/Time: 24./25.8.1996, 00.50 Telescope: N 205/1000 Magn: 80x Filter: Field: 37' NE Lim.mag: 6.2m Background sky: 2 Seeing: 2-3 Weather: +8 °C, no Moon. Brightness: 4 Alt: 75° Description: A faint cluster. Estimated Trumpler-type III 1 p. About 15 stars mag. 13,5... within 4'. The stars are quite evenly distributed and of similar brightness like in many other moderate/rich clusters (M37, M11, ngc 7789, ngc 188 etc). A bit concentrated near the 3 brightest stars (a lone one and a pair near it) at the center of the field. No bright stars in this area.