If the arrival date is January 2059, what is the total amount of signal power?
CREATE TABLE "targets" (
  "hd_designation" text,
  "constellation" text,
  "distance_ly" text,
  "spectral_type" text,
  "signal_power_k_w" real,
  "date_sent" text,
  "arrival_date" text
);
SELECT COUNT("signal_power_k_w") FROM "targets" WHERE "arrival_date"='January 2059';