Japan Pulls Off One of the Closest Asteroid Flybys Ever

2026-07-10 · Source: IEEE Spectrum · Field: Science & Research — Space Science & Astronomy, Engineering & Applied Sciences · Depth: Intermediate, short

Summary

Japan's veteran Hayabusa2 sample return spacecraft executed one of the closest asteroid flybys ever on July 5, passing within approximately one kilometer of the near-Earth asteroid Torifune. Launched in 2014, Hayabusa2 previously visited asteroid Ryugu, arriving in June 2018 and returning samples in December 2020. Despite being an aging probe with a single ion engine and degraded Optical Navigation Camera-Telescope (ONC-T) sensitivity (15-20% loss), JAXA engineers upgraded its guidance, navigation, and control package. This allowed the craft to perform a high-speed flyby at 5.3 km/s, capturing images that revealed Torifune as a contact binary. This mission also served as a valuable test for rapid reconnaissance techniques crucial for planetary defense. Hayabusa2 is slated for a 2031 rendezvous with asteroid 1998 KY26.

Key takeaway

For space mission planners evaluating extended operations for aging probes, Hayabusa2's recent flyby demonstrates that significant scientific returns and technical validation are possible with remote software upgrades. You should consider investing in adaptable guidance systems and in-flight calibration capabilities to maximize the lifespan and utility of your deep-space assets, especially for planetary defense reconnaissance. This approach can yield critical data even from hardware past its prime.

Key insights

An aging spacecraft's upgraded navigation enabled an unprecedented close asteroid flyby, yielding scientific data and planetary defense insights.

Principles

• Extended missions can yield new science.
• Software upgrades enhance aging hardware.
• Close flybys reveal asteroid morphology.

Method

JAXA upgraded Hayabusa2's guidance, navigation, and control package from afar, enabling optical guidance for a 1 km flyby at 5.3 km/s, with sensor calibration and a dedicated science observation phase.

In practice

• Calibrate sensors inflight for accuracy.
• Prioritize navigation during approach.
• Use high-speed flybys for rapid recon.

Topics

• Hayabusa2
• Asteroid Flyby
• Spacecraft Navigation
• Planetary Defense
• JAXA
• Torifune

Best for: Research Scientist, Domain Expert, Tech Journalist

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Editorial summary, takeaway, and curation by AIssential. Original article published by IEEE Spectrum.