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“Planets, Comets and Asteroids”. Highly commended: Near Earth Object 164121 (2003 YT1) by Derek Robson (UK) On 31 October 2016, Near Earth Asteroid 164121 (2003 YT1) made a close encounter with Earth at 3 million miles. This Apollo asteroid with an orbital period of 427 days was discovered by the Catalina Sky Survey on 18 December 2003. The photographer’s first attempt at imaging the asteroid was done with a camera on a fixed tripod, controlled by Astrophotography Tool software. Loughborough, Leicestershire, UK, 2 November 2016 Canon 1100D, 300 mm f/5.6 lens, ISO 1600, 56 x 25-second exposures. (Photo by Derek Robson/Insight Astronomy Photographer of the Year 2017)
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