Categories: Asteroids

First Movie of Asteroid 2005 YU55’s Flyby

Here’s a short movie of Asteroid 2005 YU55, created from data collected from the 70-meter Deep Space Network antenna at Goldstone, California. The video was generated from six frames, and each of the six frames required 20 minutes of radar data collection. They are the highest-resolution images ever generated by radar of a near-Earth object.

The data is from Nov. 7, 2011 between 19:24 and 21:35 UT (2:24 p.m. and 4:35 p.m. EST). At the time, 2005 YU55 was approximately 860,000 miles (1.38 million kilometers) away from Earth. Resolution is 4 meters per pixel.

“The movie shows the small subset of images obtained at Goldstone on November 7 that have finished processing. By animating a sequence of radar images, we can see more surface detail than is visible otherwise,” said radar astronomer Lance Benner, the principal investigator for the 2005 YU55 observations. “The animation reveals a number of puzzling structures on the surface that we don’t yet understand. To date, we’ve seen less than one half of the surface, so we expect more surprises.”

The trajectory of asteroid 2005 YU55 is well understood. At the point of closest approach today at 3:28 p.m. PST (6:28 p.m. EST/2328 UTC), it was no closer than 201,700 miles (324,600 kilometers), as measured from the center of Earth. The gravitational influence of the asteroid will have no detectable effect on anything here on Earth, including our planet’s tides or tectonic plates. Although 2005 YU55 is in an orbit that regularly brings it to the vicinity of Earth (and Venus and Mars), the 2011 encounter with Earth is the closest this space rock has come for at least the last 200 years.

The last time a space rock as big came as close to Earth was in 1976, although astronomers did not know about the flyby at the time. The next known approach of an asteroid this large will be in 2028.

Emily Lakdawalla at the Planetary Society Blog has an article explaining how images are created from radar data.

Nancy Atkinson

Nancy has been with Universe Today since 2004, and has published over 6,000 articles on space exploration, astronomy, science and technology. She is the author of two books: "Eight Years to the Moon: the History of the Apollo Missions," (2019) which shares the stories of 60 engineers and scientists who worked behind the scenes to make landing on the Moon possible; and "Incredible Stories from Space: A Behind-the-Scenes Look at the Missions Changing Our View of the Cosmos" (2016) tells the stories of those who work on NASA's robotic missions to explore the Solar System and beyond. Follow Nancy on Twitter at https://twitter.com/Nancy_A and and Instagram at and https://www.instagram.com/nancyatkinson_ut/

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