Hayabusa2 Flies About 10 Kilometers From Asteroid Torifune, and Its First Images Reveal a Two-Lobed Contact Binary

Overview

Japan’s Hayabusa2 spacecraft has completed its high-speed pass of the near-Earth asteroid Torifune, and the first images beamed home show a double-lobed body that scientists describe as a contact binary. “On 5 July 2026 at 18:30 JST (error margin: ±1 second), Hayabusa2 successfully performed a flyby of Torifune,” JAXA said in a release dated July 6. The encounter delivers the results of a maneuver The Machine Herald previously reported as an upcoming rehearsal for planetary-defense navigation.

What We Know

The spacecraft was healthy after the pass: at 18:35 JST on July 5, Hayabusa2 “was confirmed from ground communications to be operating normally,” according to JAXA. The agency reported the closest imaging distance to the asteroid as approximately 10 km, per JAXA, a figure EarthSky also gave as roughly 6 miles (10 km).

The pass was fast. Hayabusa2 swept by “traveling at speeds approaching 5 kilometers per second,” The Debrief reported — consistent with the roughly 5 km/s flyby JAXA had planned, the agency said ahead of the encounter. Torifune measures about 1,475 feet (450 meters) across, according to Space.com and EarthSky, and sat about 62 million miles (100 million kilometers) from Earth at the time of the flyby, Space.com reported.

What the Images Show

JAXA released two views of the asteroid: one from the ONC-T optical navigation camera and one from the TIR thermal infrared imager, the agency said. The optical image resolved a shape that had only been inferred from afar. Torifune “revealed itself to be two rubble piles joined together, or what astronomers call a contact binary,” EarthSky wrote, describing a gray body with two roundish lobes and a narrow waist covered in small bumps. Space.com likewise characterized the returned photo as showing a “two-headed” asteroid.

The thermal camera added a second layer. The TIR image showed Torifune’s surface to be “much cooler in what appear to be shadowed regions seen in the optical image, and much warmer where the surface faces the sun,” Space.com reported.

Most of the science return is still to come. “At present, only part of the data acquired by the scientific instruments has been transmitted to Earth. The remaining data will be transmitted to the ground during future operations,” JAXA said. EarthSky noted that JAXA is still acquiring the data and that more revelations about the asteroid are expected.

Why It Matters

The flyby was staged as much to prove a technique as to study a new world. “The purpose of this mission is to acquire fundamental data for the technology required to accurately guide a probe to impact with small celestial bodies,” JAXA said before the pass. The Debrief framed the encounter as feeding into planetary defense — how to deflect an asteroid large enough to pose a risk to Earth.

Torifune is a waypoint on a longer journey. Hayabusa2’s extended mission calls for a rendezvous with the small asteroid 1998 KY26 in 2031, The Debrief reported, when the spacecraft is expected to enter orbit and attempt to land on the surface, according to EarthSky.

What We Don’t Know

• The full scientific picture. JAXA has downlinked only part of the instrument data so far, with the remainder to follow in later operations, per the agency.
• Detailed physical properties — composition, the precise dimensions of each lobe, and quantitative surface temperatures — await the remaining instrument data, which JAXA said has not yet been fully transmitted to Earth, per the agency.
• Whether the guidance performance demonstrated at Torifune will translate cleanly to the far smaller, faster-spinning 1998 KY26 targeted for 2031, as previously reported.