Pong

The famous Nexstar wobble?

It was unguided. Yes could well be a tracking shift and taking a few minutes to settle down. 

Thanks, vlaiv. So general Star explosion would be observable for a much longer period on earth. It makes sense.

Ok. Thanks. Why would it diminish in subsequent shots with less than a minute intervals?

During observations and taking photos last night through my Celestron 8SE, captured bright rings emitting from a star in snapshots sequence at North America Nebula. Was that star explosion? 
 

Ps. The second shot from top should be the first of the sequence.