Chart of Comet C/2012 S1 ISON as seen from New Mexico at astronomical twilight (5:22 am) on September 15.
iTelescope user Seiichiro Kiyota has imaged comet C/2012 S1 ISON using the modestly sized iTelescope T4. This is a significant feat as the comet is only just in T4's lower limit of travel at nautical twilight.
The comet remains in nautical twilight until the 15th of September, when it finally makes astronomical twilight at the lower limit of T4 and T5 telescope travel (it is never in the view of the SSO scopes at or before nautical twilight).
Observations during this time are crucial to understanding the development of this comet, over-hyped as the "comet of the century" in some quarters. despite the hype it will, provided it doesn't disintegrate before perihelion, be one of the brightest comets for some years, possibly rivalling or exceeding C/2006 P1 McNaught. This is a wonderful opportunity for amateur astronomers to contribute to comet science through our observations of this comet on it's first escursion through the inner solar system from the Oort cloud.
During late September and all of October the comet will be in a good position for imaging, although never higher than 40 degrees above the horizon at astronomical twilight. The comet comes close to Mars (and Spica) from our perspective on October 16, although at possibly magnitude 8.5 imaging it and bright Mars together will be a challenge.
(Hopefully) rapidly brightening ISON remains above the iTelescopes filed of travle at astronomical twilight until 13 November, and rapidly passes beyond the limit of travel at nautical twilight soon after.
Shortly after this the comet reaches perihelion (28 November), and then we will have to wait to see if it disintegrates, or provides us with a spectacle as it returns from the Sun.