How Rosetta navigated the volatile environment of Comet 67P/Churyumov–Gerasimenko
In short: After a decade in deep space, the Rosetta spacecraft arrived at Comet 67P in August 2014. What followed was a high-stakes orbital dance, maneuvering through unpredictable outgassing and extreme solar proximity to conduct the first detailed study of a comet's surface.
The mission's complexity began upon arrival on 6 August 2014, when Rosetta reached a distance of 100 km from the comet. This initial phase focused on mapping orbits to identify a landing site for the Philae lander, which was eventually released on 12 November. However, the comet's unpredictable nature posed constant challenges. In early 2015, a particularly close flyby triggered a 'safe mode,' forcing the spacecraft to retreat temporarily to ensure its safety before it could cautiously approach again.
The comet's activity levels significantly dictated Rosetta's proximity. Around the perihelion in August 2015, increased activity forced the spacecraft to remain well beyond 100 km for several months. This period also saw a brief, temporary reconnection with Philae in June 2015, though a permanent communication link could not be established despite weeks of dedicated trajectories. Following this, Rosetta undertook far excursions, reaching 1500 km from the comet on the dayside, and later making night-side excursions in March and April 2016.
As the comet's activity subsided, Rosetta began flying elliptical orbits that brought it progressively closer. By 24 September 2016, the spacecraft transitioned into a 16 x 23 km orbit to prepare for its final descent. The mission concluded on 30 September 2016 at 10:39 GMT, when Rosetta performed a slow descent from 19 km altitude, eventually striking the Ma’at region on the comet's head. While the mission's trajectory was reconstructed from real data, the comet's rotation in visualizations is simulated, as natural gravity and outgassing caused deviations from predicted paths.
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Sources
- Summary by Intellect · source: Rosetta’s complete journey around the comet
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