The specified capacitor is the CAP CER 51PF 2KV C0G/NP0 1111. It has a capacitance of 51 pF with a tolerance of ±10% and can withstand a voltage of up to 2000V, or 2kV. This component is classified as a Ceramic Capacitor from the C0G/NP0 series with the code 2828 Metric, denoting its dimensions in millimeters (28mm diameter x 28mm length).