File:Hubble's Last Look At Comet ISON Before Perihelion.jpg
Comet ISON will come closest to the Sun on November 28, a point in its orbit known as perihelion. Comet ISON was fairly quiet until 1 November 2013, when it experienced an outburst that doubled the amount of gas the comet emitted. After this image was taken, a second outburst shook the comet, increasing its activity by a factor of ten. Over the past couple of nights, the comet has stabilised at its new level of activity.
It is now bright enough to be seen with a good pair of binoculars from a dark site, in the morning skies towards the East.
- Hubble Heritage release
- ISONblog, an online source offering analysis of Comet ISON by Hubble Space Telescope astronomers and staff at the Space Telescope Science Institute in Baltimore, USA.