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He adds that although it won’t be observable to the naked eye throughout its closest moments on Halloween, it would be noticeable to those lucky enough to have a good-quality amateur telescope.
It’s anticipated to pass through the constellation of Orion at about 17:18 UT on Saturday 31 October. That’s 5:18pm EDT and 3:18am AEST.
According to a recent report of NASA's Near-EarthObject Observations Program, as of 16 October 2015, 13, only 251 near-Earth objects have been discovered and 877 of which are asteroids with a diameter of almost 1 kilometre or larger. Some 1,635 of these have been categorized as Potentially Hazardous Asteroids (PHAs).
According to NASA none of these will come close enough to hit Earth anytime in the predictable future. NASA reported back in August "All known Potentially Hazardous Asteroids have less than a 0.01 percent chance of impacting Earth in the next 100 years,"