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New Horizons Wakes From 321‑Day Hibernation and Reports All Systems Healthy

Ground teams are downlinking health and stored science data as they test upgraded autonomy and prepare an Alice ultraviolet study of hydrogen at the heliosphere’s termination shock in about three weeks.

Overview

  • NASA and Johns Hopkins APL confirmed the spacecraft exited a 321‑day hibernation in good health and that weekly status beacons during cruise were all reported as “green.”
  • The probe is about 5.9 billion miles from Earth, so one-way radio signals take roughly nine hours and controllers are using the Deep Space Network to receive telemetry and coordinate operations.
  • Teams are first downlinking spacecraft health and safety telemetry, then will retrieve stored instrument data that were collected while systems were mostly powered down.
  • New autonomy software and ground‑system upgrades have been deployed to handle reduced power and long signal delays at extreme distance, and checkouts of spacecraft and instruments are underway.
  • In roughly three weeks the Alice ultraviolet spectrograph will begin a targeted survey of hydrogen in the outer heliosphere to probe the termination‑shock region, offering measurements that complement earlier Voyager data.