After Getting Slammed by DART, Asteroid Dimorphos has Grown a Tail by Nancy_A
The astronomers said that the dust trail seen here is the ejecta that has been pushed away by the Sun’s radiation pressure, much like the tail of a comet. In this image, the ejecta can be seen stretching from the center to the right-hand edge of the field of view at about 3.1 arcminutes long. With Dimorphos’ distance from Earth at the time of the observation, that would equate to at least 10,000 kilometers from the point of impact.
“It is amazing how clearly we were able to capture the structure and extent of the aftermath in the days following the impact,” said Kareta., astronomer Alain Maury said on October 3, the tail has now grown to 13 arcminutes long. That means by now the ejecta tail could measure at least 50,000 km long.
DART intentionally crashed into Dimorphos, which is a moonlet that orbits a larger asteroid Didymos, on Monday September 26, 2022. This was the first planetary defense test in which an impact of a spacecraft attempted to modify the orbit of an asteroid. The DART team will need several weeks of analysis to determine if and by how much the orbit of Dimorphos around Didymos was changed.
“Now begins the next phase of work for the DART team as they analyze their data and observations by our team and other observers around the world who shared in studying this exciting event,” said Knight.
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