NASA will host a briefing at 11 a.m. PDT (2 p.m. EDT) Thursday, Oct. 9, to outline the space and Earth-based assets that will have extraordinary opportunities to image and study a comet from relatively close range to Mars on Sunday, Oct. 19.
The briefing will be held at NASA Headquarters’ and broadcast live on NASA Television and the agency’s website.
Comet C/2013 A1 Siding Spring will miss Mars by only about 88,000 miles (139,500 kilometers). That is less than half the distance between Earth and its moon and less than one-tenth the distance of any known comet flyby of Earth. The comet’s nucleus will come closest to Mars at about 11:27 a.m. PDT (2:27 p.m. EDT), hurtling at about 126,000 mph (56 kilometers per second), relative to Mars.