Palavras dos pesquisadores do NASA Comet ISON Observing Campaign, texto do Karl Battams. Perderam o feriado de ação de graças para isso! Como ele mesmo diz, isso foi ontem... Schrödingers Comet Submitted by Karl Battams on Thu, 11/28/2013 - 20:35 Ill just say this upfront right now: whatever you read in the following blog post, please feel free to assume it is completely incorrect and the truth is actually quite contrary to what Im saying. It has been - and continues to be - one of those days. So this will be a relatively brief blog post because were up to our necks in media inquiries and attempting to do real science to figure out the mystery that is comet ISON, and Matthew and I are basically the only ones that have abandoned our loved ones on this US national Holiday and continued to work. Heres what we know so far: After impressing us yesterday, comet ISON faded dramatically overnight, and left us with a comet with no apparent nucleus in the SOHO/LASCO C2 images. As the comet plunged through the solar atmosphere, and failed to put on a show in the SDO images, we understandably concluded that ISON had succumbed to its passage and died a fiery death. Except it didnt. Well, maybe... After perihelion, a very faint smudge of dust appeared in the the LASCO C2 images along ISONs orbit. This surprised us a little, but we have seen puffs of dust from Sungrazer tails, so it didnt surprise us enormously and didnt change our diagnosis. We watched and waited for that dust trail to fade away. Except it didnt. Now, in the latest LASCO C3 images, we are seeing something beginning to gradually brighten up again. One could almost be forgiven for thinking that theres a comet in the images! Matthew and I are ripping our hair out right now as we know that so many people in the public, the media and in science teams want to know whats happened. Wed love to know that too! Right now, heres our working hypothesis: As comet ISON plunged towards to the Sun, it began to fall apart, losing not giant fragments but at least a lot of reasonably sized chunks. Theres evidence of very large dust in the form of that long thin tail we saw in the LASCO C2 images. Then, as ISON plunged through the corona, it continued to fall apart and vaporize, and lost its coma and tail completely just like Lovejoy did in 2011. (We have our theories as to why it didnt show up in the SDO images but thats not our story to tell - the SDO team will do that.) Then, what emerged from the Sun was a small but perhaps somewhat coherent nucleus, that has resumed emitting dust and gas for at least the time being. In essence, the tail is growing back, as Lovejoys did. So while our theory certainly has holes, right now it does appear that a least some small fraction of ISON has remained in one piece and is actively releasing material. We have no idea how big this nucleus is, if there is indeed one. If there is a nucleus, it is still too soon to tell how long it will survive. If it does survive for more than a few days, it is too soon to tell if the comet will be visible in the night sky. If it is visible in the night sky, it is too soon to say how bright it will be... I think you get the picture, yes? We have a whole new set of unknowns, and this ridiculous, crazy, dynamic and unpredictable object continues to amaze, astound and confuse us to no end. We ask that you please be patient with us for a couple of days as we analyze the data and try to work out what is happening. We realize that everyone now wants to know if it will be visible in the night sky, and how bright it might be. We really hate speculating right now but if someone were to force us into an answer, we would reluctantly say that at least some faint tail remnant should be visible in the coming week or so. But this is highly speculative so please dont take this too seriously just yet. We will absolutely post updated info here as soon as were more confident, and I will of course continue blogging when I can in the meantime. Just be patient on this and the truth will unfold in time! And I just want to end on this note: not long after comet ISON was discovered, it began to raise questions. Throughout this year, as many of you who have followed closely will appreciate, it has continued to confuse and surprise us. For the past few weeks, it has been particularly enigmatic and dynamic, in addition to being visually spectacular. This morning we thought it was dying, and hope was lost as it faded from sight. But like an icy phoenix, it has risen from the solar corona and - for a time at least - shines once more. This has unquestionably been the most extraordinary comet that Matthew and I, and likely many other astronomers, have ever witnessed. The universe is an amazing place and it has just amazed us again. This story isnt over yet, so dont stray too far from your computer for the next couple of days!
Posted on: Fri, 29 Nov 2013 11:23:11 +0000
Trending Topics
Recently Viewed Topics
© 2015