It was nicknamed Pitbull, "due to its small size of up to 85 feet (26m) and scary demeanor" according to a Slooh Space Telescope press release.
Slooh Space Telescope will be transmitting images of the space rock from the Canary Islands Observatory, beginning on Saturday night at 10 p.m. EDT. The Helix nebula will also be in the view through the telescope.
At an estimated 88 feet in diameter, 2014 RC is roughly the same size as the 98-foot-wide 2012 DA14, which passed by in February of 2013. 2014 RC won't come as close as 2012 DA14, which missed Earth by only 17,200 miles. At it's closest, on Sunday, September 7th, 2014 RC will pass by 25,000 miles from the center of the Earth, over the Canary Islands, off the coast of Africa. (From the center to the surface of the earth is about 4,000 miles, so that's about 21,000 miles above the surface of the Earth.)