Comet ISON


C/2012 S1 ISON

Comet ISON

Comet ISON November 12, 2013
This image shows that the tail of Comet ISON (C/2012 S1) is beginning to develop some structure. We can clearly see the development of two tails. The one to the right, called either the gas or ion tail, is straight as an arrow and always points away from the Sun. The other is the dust tail, which is wider and curves ever so slightly as it traces the comet’s orbit.
Gerald Rhemann
Two astronomers found Comet ISON (C/2012 S1) glowing dimly at magnitude 18.8 on September 21, 2012. On November 28 of this year, ISON will lie closest to the Sun — a scant 680,000 miles (1.1 million kilometers) from its surface. Latest predictions indicate that it will peak at magnitude –4.5, equivalent to the brightness of Venus.

Comet ISON is already visible through small- to medium-sized telescopes from a dark site, and binoculars…

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