Artyom Novichonok estimated "his" comet's brightness at 10,2mag this morning, the diameter of it's coma at 4,6' and the tail at 15'. My images show a 10' long tail. As always, I used simple equipment (a 8" f/4 Newtonian and a Canon EOS 450Da DSLR). Skyglow was reduced with an Astronomik CLS filter.
|Comet C/2012 S1 (ISON) on Oct. 12, 03:00-04:24 UTC. Jan Hattenbach/Sternwarte Aachen|
|The inverted and enhanced imaged clearly shows a 10' long tail and a fairly bright coma.|
|Three images, taken with exactly the same equipment between September 28 and October 12. The comet has considerably increased both in brightness and size.|
The "impending demise" should be off the table, one might think. Ignacio Ferrín however keeps believing the comet is disintegrating, called for "orange alert" and is drawing some "red lines" (whatever that means). Frankly, I cannot see on what ground his assessment is based, since all the world is watching ISON obvousily gaining brightness, not loosing it. [Update, Oct. 14: Ferrín updated his secular light curve with recent observational data, acknowledging the comet is getting brighter.] In the meantime, Zdenek Sekanina has published a different, down-to-earth view on ISON's prospects until perihelion compared to other comets (and will give updates on a weekly basis). Also read Karl Battams recent post on this.