Re: [guide-user] Comet display incorrect?

cometmanau Dec 26, 2018

Guide routinely displays the ion tail.
In the instance of C/2015 V2, which had a prominent dust trail,
you can also display this in guide under extras/asteroid comet options/trail length change from 0 to 1 days
Sent: Wednesday, December 26, 2018 5:18 AM
Subject: Re: [guide-user] Comet display incorrect?

thanks for this helpful hint and yes, you are very right. When I look on a stacked image of this session I can clearly see the ion tail pointing to the right direction. I should have known this - silly me.
I added a corresponding image to the before mentioned link.
Sent: Tuesday, December 25, 2018 4:41 PM
Subject: Re: [guide-user] Comet display incorrect?

I think you aren’t looking at an ion tail not the orbital tail. Guide only shows the latter. One is affected by solar winds and magnetic line. Depending on the observer view, one tail can be more prominent than the other. Unfortunately guide or other softwares will only show the orbital.


On Dec 25, 2018, at 6:16 AM, 'Rolf Stadelmaier' rostm@... [guide-user] <> wrote:

Hello all,
when I hunted about older comet images and diagnosed the comets position, I experienced a never before seen incorrect display of the comet in Guide9.
I noticed that in case of comet Johnson (C/2015 V2 - 2017-05-17 22:34:48 UTC) Guide9 displayed the comets position with some offset and - and this was what startled me - the tail showing in a total wrong direction in comparison to my images.
Comparatively I find the display of comet 21P/Giacobini-Zinner (2018-08-16 21:15:24) in total accordance with my images.
To clarify what I found I uploaded some graphics here.
Have others experienced such unexpected behavior of Guide9 too? And is there a clearing explanation of this riddle?
Thanks for noticing,
Rolf Stadelmaier