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A huge asteroid set to sail past Earth on Friday has its own moon, NASA scientists have just discovered. Researchers obtained a series of radar images of the approaching asteroid 1998 QE2 late Wednesday using the Deep Space Network antenna at Goldstone, Calif. Images captured over the course of two hours showed that the asteroid is actually a binary system. The main space rock is the size of nine ocean liners, roughly 1.7 miles across, and the satellite that orbits it is estimated to be 2,000 feet wide, according to NASA. Binary systems are quite common among near-Earth asteroids. Of space rocks at least 655 feet across, about 16 percent are binary or triple systems, NASA officials said.
Goldstone radar observations on May 29, 2013, discovered a satellite roughly 600 meters (2,000 ft) in diameter.[5] In radar images, the satellite appears brighter than the primary because it is rotating significantly slower and the much slower rotation squishes the satellite along the Doppler axis, making it appear very skinny and bright compared to the primary.[6
Originally posted by eriktheawful
reply to post by abeverage
Goldstone radar observations on May 29, 2013, discovered a satellite roughly 600 meters (2,000 ft) in diameter.[5] In radar images, the satellite appears brighter than the primary because it is rotating significantly slower and the much slower rotation squishes the satellite along the Doppler axis, making it appear very skinny and bright compared to the primary.[6
Source
Has to do with the fact that they're using Doppler radar, and the speed of rotation of the "moon". It's the frequency of the return and that data then translated into a image.
I was wondering about this yesterday when I saw the image that was provided of 1998 QE2. I was at first thinking they had a glitch of some sort. Glad to see it turns out it really is something that is there.