It has become too dynamic. Changing every hour. New info- new image- new knowledge base are coming every moment. Attached image is taken with a space born telescope. See what Jakub Cerny of CIOC (A global conglomeration of experts to study ISON) says on this: The long thin tail visible originaly on STEREO-A images is now also visible in SOHo C3 images. From SOHo images it is clearly visible that this is not the ion-tail and it is more likely synchronic feature. Synchronic features are originated in very shortime extensive emission of various sized dust grains. Such feature was observed after disruption of comet Lovejoy. So it really seems something disintegrated in here if it was fragment or entire nucleus is part of questions.
Actually the nucleus disruption seems to be still the best option.
1. As my calculations yesterday pointed if there would be anything active in coma it would correspond to one spherical nucleus with diameter 630 - 100 meters. If there will be more subfragments (as seen in C/1999 S4 (LINEAR) case) such active surface can be easily reach by larger number of 20-50 meter sized fragments.
2. Comet brighten nearly as simple reflecting body, actualy if some post-disruption larger subfragments keep to disintegrating, amount of dust in coma will grow and brightnes can slightly grows.
3. Ion tail is still not present, there is small or no outgassing in coma.
4. Spine tail a synchronic feature observed in case of disintegrated comets is present, and even it looks that brightness is enhanced towards this tail, which indicate that majority of dust comming from this event.
Actually the nucleus disruption seems to be still the best option.
1. As my calculations yesterday pointed if there would be anything active in coma it would correspond to one spherical nucleus with diameter 630 - 100 meters. If there will be more subfragments (as seen in C/1999 S4 (LINEAR) case) such active surface can be easily reach by larger number of 20-50 meter sized fragments.
2. Comet brighten nearly as simple reflecting body, actualy if some post-disruption larger subfragments keep to disintegrating, amount of dust in coma will grow and brightnes can slightly grows.
3. Ion tail is still not present, there is small or no outgassing in coma.
4. Spine tail a synchronic feature observed in case of disintegrated comets is present, and even it looks that brightness is enhanced towards this tail, which indicate that majority of dust comming from this event.
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