NASA crashed a spacecraft into an asteroid last month. It took some astronomical know-how to confirm the redirection test was a success.
ground-based observatories around the world, including the Las Cumbres Observatory telescopes in South Africa and the Southern Astrophysical Research Telescope in Chile. A limitation of optical telescopes is that, due to the distance and small size of the Didymos-Dimorphous system, the two objects are seen as a single glowing dot. The asteroids are just 0.
drops by around 10% each time Dimorphos passes in front of it. It’s through these clock-work eclipses that astronomers knew Dimorphos’s orbital period prior to the test and how they’re able to determine it now. That Dimorphos passes in front of Didymos from our perspective on Earth is fortuitous, andThe DART team studied reductions in brightness caused by Dimorphos’s eclipses of Didymos.
The “two independent methods” provided “the same answer,” said Chabot, in reference to Dimorphos’s new 11 hour and 23 minute orbital period. She credited the international team for getting “onto this very quickly.” But plenty of work remains.known about the effect of the experiment. DART was a rousing success, but it’s clear that scientists still have lots to learn about kinetic impactors and the art of deflecting asteroids.
, scheduled to launch in 2024, will observe Dimorphos in late 2026 and send back images and other data to help us better understand the effects of DART. A robust planetary defense system against asteroids won’t be built overnight, but this important work has now started in earnest.
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