Looking for advice on comet tailed stars

Are you using any kind of dew-heater?
i gebt similar artifacts when I run the dew-heater with too much power.

Hi,  I see you are using the Starizona SCT Corrector.  I got similar results when I fitted it the wrong way round.  I has threads at both ends so it's easily done. The correct way is to have the female thread towards the scope and the male towards the camera.
Max

When using the dew heater ring you have to use a controller (pwm dimmer, dew controller, whatever).
Otherwise it wil heat with approx 25W and that is almost double the amount needed. 

I made the same misstake at the beginning. 

Also now using the 2x dew controller from celestron in auto mode lowest senstivity is still too much as it will (depending on the environment) unessesary heat with more than 15W.

One other thought. It could be a diffraction spike. For example, if your cable or some part of the dew heater is a little into the light path on one side, it would produce a spike. It might be only in the light path when you are at the edge of the field in one direction, so would only be seen on one side of your image. Or it could be your OAG mirror is too close to your FOV causing the spike. 

To troubleshoot the issue, put a bright star in the corner where the problem is and take an exposure that shows the problem. Then remove your dew shield or move your OAG mirror out, etc. until you find the problem. If you seen a dew heater wire sticking out, hold a pencil there in front of the corrector at that point and see if the spike gets worse (easier than removing the dew heater). Note to check if you are getting too much heat, unfocus a bright star a lot with a short exposure so you can see a big fat donut that is not overexposed. In the lit part of the donut you will be able to see any convection currents, if it is really bad it can look like this:

It likely would not be that bad, more often you will see lines moving through the donut--can be do to seeing, but convention currents tend to have a point of origin. If you see a point that is radiating, again put a pencil in front of the corrector to one side, you will see it as a shadow and that will tell you which side the heat is coming from. My practice is every night before starting imaging I check the donut to confirm collimation (usually stable with my SCT) and tube currents to make sure I am equilibrated. With an SCT I also go clockwise to the donut (mirror goes down), then counterclockwise to focus, mirror goes up. This also ensures the mirror is not getting tilted due to stickiness (as CCW pushes the mirror up, so you know it is in good contact with the focus ring, and spreads out the grease too, reducing stickiness. I have not personally noticed a change in collimation due to mirror flop after a meridian flip, but you might also want to check your donut after a meridian flip (I usually refocus then anyway).

Also, if this is only one night that you saw this could even be wind, I have seen such tails when the wind blows the mount a bit, it may only be for a fraction of a second, not enough to show in guiding, but it can produce a tail. Wind blows in one direction, so these swings all tend to be in the same direction depending which way the telescope is pointed.

Good luck
Rick