ESA’s Hera cuts speed by 70 m/s ahead of its Didymos arrival
ESA said Hera fired its second braking burn on 22 October, reducing its speed relative to the Didymos asteroid pair by 70 m/s from 2,300 km away. The spacecraft is now approaching at 20 m/s, with three smaller manoeuvres planned before its scheduled arrival on 4 November 2026.
Bottom line — Hera is due to arrive on 4 November 2026 and measure how NASA’s DART impact changed Dimorphos.
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ESA said the 31-minute burn was completed in two stages, with the team checking its progress before firing the remainder.
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Three transition manoeuvres planned between 25 and 31 October are intended to bring Hera’s relative speed close to zero, according to ESA’s mission timeline.
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Hera is due to study Dimorphos, the 151 m-wide moon of the 780 m-wide Didymos.
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NASA’s DART spacecraft struck Dimorphos in September 2022, shortening its orbit around Didymos by 32 minutes, according to the Orbinauts report.
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Hera will investigate the impact’s effects, including the crater and material thrown off the asteroid, which have so far been inferred from Earth-based telescope observations.