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Pages: 1 nytecam Postmaster Reged: 08/20/05 Loc: London UK Comet 2012 K5 Linear last night       #5595590 - 12/30/12 05:30 AM Attachment (94 downloads) Edit   Reply   Quote Quick Reply   Exceedingly poor UK weather of late but clear last night for my first brief shot of this comet above a bright gibbous moon - the coma is very large Post Extras:       Tonk Postmaster Reged: 08/19/04 Loc: Leeds, UK, 54N Re: Comet 2012 K5 Linear last night [Re: nytecam]       #5595592 - 12/30/12 05:35 AM Edit   Reply   Quote Quick Reply   Nice grab Maurice. The only up coming clear night slot 'oop north' is Monday night - I'll give it a go then. My first images of this comet were back in October so its come on a lot since then Post Extras:       Cames sage Reged: 08/04/08 Re: Comet 2012 K5 Linear last night [Re: nytecam]       #5595606 - 12/30/12 06:14 AM Edit   Reply   Quote Quick Reply   Thanks for posting, Maurice. I noticed that the coma is asymmetrical around the nucleus and predominates to its right side of the photo (not referring to the obvious elongation of the tail). What do you think causes that effect? Also, I couldn't help notice the bluish component in the tail (possibly at an angle to the main tail). Is that due to the ionization effect seen in some of the other comets like Hale-Bopp? It seems that the comet's progress across the constellations appears to be accelerating and even is noticeable at high power now. I really enjoy your timely photos. ------ C Post Extras:       Tonk Postmaster Reged: 08/19/04 Loc: Leeds, UK, 54N Re: Comet 2012 K5 Linear last night [Re: Cames]       #5596251 - 12/30/12 02:22 PM Edit   Reply   Quote Quick Reply   Quote: What do you think causes that effect? Configuration of comet wrt to sun and earth. Line of sight effect when looking at a comet tail obliquely Post Extras:       nytecam Postmaster Reged: 08/20/05 Loc: London UK Re: Comet 2012 K5 Linear last night [Re: Cames]       #5596515 - 12/30/12 04:37 PM Attachment (35 downloads) Edit   Reply   Quote Quick Reply   Quote: Thanks for posting, Maurice.I noticed that the coma is asymmetrical around the nucleus and predominates to its right side of the photo (not referring to the obvious elongation of the tail). What do you think causes that effect? Also, I couldn't help notice the bluish component in the tail (possibly at an angle to the main tail). Is that due to the ionization effect seen in some of the other comets like Hale-Bopp? It seems that the comet's progress across the constellations appears to be accelerating and even is noticeable at high power now. I really enjoy your timely photos.------C Thanks Tony & Cames - here's a concecutive 3x30s stack showing rapid motion SW eg lower right Post Extras:       Centaur Vendor Reged: 07/12/04 Loc: Chicago Re: Comet 2012 K5 Linear last night [Re: nytecam]       #5596541 - 12/30/12 04:48 PM Edit   Reply   Quote Quick Reply   Thanks for sharing your fine photos, Maurice. I've updated my graphics and data based on Solex orbital elements for Comet C/2012 K5 (LINEAR): www.CurtRenz.com/comets Post Extras:       nytecam Postmaster Reged: 08/20/05 Loc: London UK Re: Comet 2012 K5 Linear last night [Re: Centaur]       #5600014 - 01/01/13 05:34 PM Attachment (35 downloads) Edit   Reply   Quote Quick Reply   Thanks Curt - quick image from tonight on New Years Day below - the coma has changed dramatically in just two days since my last pic Post Extras:       Tonk Postmaster Reged: 08/19/04 Loc: Leeds, UK, 54N Re: Comet 2012 K5 Linear last night [Re: nytecam]       #5600161 - 01/01/13 07:14 PM Edit   Reply   Quote Quick Reply   Thats because our viewing angle of the comet is changing very very rapidly now Post Extras:       BrooksObs super member Reged: 12/08/12 Re: Comet 2012 K5 Linear last night [Re: Tonk]       #5600504 - 01/01/13 10:58 PM Edit   Reply   Quote Quick Reply   Tonk is correct. I believe that late on December 30th the Earth passed through the comet's orbital plane. At the same time the Sun, Earth and the comet were almost in a straight line and thus the comet's tail was directed almost straight away from the Earth. The result is that the comet's coma, or head, was seen projected onto the long axis of the tail. The exact placement of the comet's central condensation within the larger surrouding glow, along with the orientation and look of the reappearing tail will be changing quite rapidly over the next week, or two, as our viewing angle steadily shifts. BrooksObs Edited by BrooksObs (01/01/13 11:01 PM) Post Extras:       Cames sage Reged: 08/04/08 Re: Comet 2012 K5 Linear last night [Re: BrooksObs]       #5600766 - 01/02/13 06:50 AM Edit   Reply   Quote Quick Reply   A most fascinating apparition if you ask me. Regarding the ionization effect seen on comets: Is it the result of the solar wind interacting with cometary effluvia; and the light emission a product of excitation phenomena similar to our aurorae? ------ C Post Extras:       nytecam Postmaster Reged: 08/20/05 Loc: London UK Re: Comet 2012 K5 Linear last night [Re: Cames]       #5607771 - 01/06/13 04:59 AM Attachment (28 downloads) Edit   Reply   Quote Quick Reply   Quote: A most fascinating apparition if you ask me.Regarding the ionization effect seen on comets: Is it the result of the solar wind interacting with cometary effluvia; and the light emission a product of excitation phenomena similar to our aurorae?------C Dire conditions continue and first clearish night this week with comet recorded tonight through thin cloud. Comet now in Taurus Post Extras:       eps0mu0 member Reged: 01/16/06 Loc: San Francisco, CA Re: Comet 2012 K5 Linear last night [Re: Cames]       #5608385 - 01/06/13 01:32 PM Edit   Reply   Quote Quick Reply   Quote: A most fascinating apparition if you ask me. Regarding the ionization effect seen on comets: Is it the result of the solar wind interacting with cometary effluvia; and the light emission a product of excitation phenomena similar to our aurorae? ------ C According to Wikipedia,and some other online information, ionization of the tail occurs through UV photons, not through collisions with solar wind particles. Post Extras:       Scanning4Comets Markus Reged: 12/26/04 Loc: Deep Space! Re: Comet 2012 K5 Linear last night [Re: eps0mu0]       #5609954 - 01/07/13 11:01 AM Edit   Reply   Quote Quick Reply   Nice pics! I have to get out there and see it myself! Cheers, Post Extras:       Pages: 1

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