San Francisco Chronicle | LIVE NASA Video Chat About Comet ISON Slate Magazine (blog) Comet ISON is headed for a very, very hot date with the Sun. At roughly 18:37 UTC today (1:37 p.m. EST) it will be at perihelion, its closest approach to the Sun, broiling away just 1.1 million kilometers (700,000 miles) above the star's surface. ISON Comet ... Comet ISON Comet Ison live stream: Watch blazing ball of dust and rock pass perilously close ... Comet in close encounter with sun |

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