Here are the back-of-the-envelope numbers for July 16, 2013.
Today, Comet ISON is approximately 2.894 AU from the sun. There are 135 days until Comet ISON reaches perihelion.
Between July 8th and July 16th, Comet ISON traveled a distance of approximately 0.114 AU.
That’s an average speed of roughly 1.32 million miles per day, or 2.13 million kilometers per day.
On July 7th, the time projected (tp) value calculated by NASA for perihelion (closest to the sun) was 2013-Nov-28.77833817.
That’s the same as November 28, 2013 at 18:40:48 UTC.
Tomorrow, on July 17th, there will be a Hubble Google+ Hangout happening for a discussion of the Hubble Space Telescope’s view of Comet ISON later this year.
Updated 07.17.2013: Here’s an embedded video of the Google+ Hangout.
NASA will have 12 different tools available to observe ISON as it approaches the sun. These include the Solar Dynamics Observatory (SDO), SOHO, STEREO, MESSENGER, BRRISON, FORTIS, the Hubble Space Telescope, the Spitzer Space Telescope, ISS, the Lunar Reconnaissance Orbiter, Swift, Curiosity, Opportunity, the Mars Reconnaissance Orbiter, and Deep Impact.