Submitted by Karl Battams on Thu, 11/21/2013 - 20:24
Yesterday, amateur astronomers online were very quick to point out that comet ISON had entered the field of view of the NASA STEREO-A Heliospheric Imager 1 ("HI-1A") camera. It wasn't much to look at, as we only had available our low-resolution "beacon" data, but nonetheless you could clearly see a bright streak on the left-hand side of the HI-1A images.
Submitted by Karl Battams on Sun, 11/17/2013 - 14:53
One of our primary functions as coordinators of the Comet ISON Observing Campaign is to encourage and foster data sharing and discussion regarding comet C/2012 S1 (ISON). This brief blog post is to do just that.
Submitted by Matthew Knight on Tue, 11/05/2013 - 21:10
This post was written by Matthew Knight with input from Dr. Carey Lisse.
November is here and Comet ISON is just a bit over three weeks from it closest approach to the Sun (astronomers call this “perihelion”). As we’ve said from the beginning, it is impossible to predict exactly what ISON will do. However, given numerous observations of previous comets, we do have a pretty good idea of the range of possible outcomes. Now that ISON has almost completed its journey from the Oort Cloud to within a million miles of the Sun’s photosphere, it seems like a good time to go over what might happen.
This week: The Final Nail in the Coffin? When ground-based observers came up empty-handed in the hunt for ISON's remains, we turned to the Hubble Telescope to see if its ultra-powerful instruments could find anything...Earlier picks can be found in the ISON Image of the Week Archives. Note that this feature will become monthly, instead of weekly, in 2014.