Anyone know what this blip in the ISS orbit is?

If you could stretch out (enlongate) the stellar trails you would certainly see the same blip.

Maybe a rat bumped into your telescope as it scurried across your garden being chased by a cat.

(It couldn't have been a rabbit as they are all snug in their burrows at night.)

Peter.

Frank, can you zoom in on that area, maybe that would shed some light ?

If you calculate how much time it took the ISS to cross the field.

Then calculate what fraction of the ISS crossing time is represented by the blip you have the time it took for the blip to come and go.

Then calculate how much time it took the stars to trail(Total exposure time).

Divide this by the "blip time" and you have the fraction of the length of a star trail that is represented by the blip within the star trail.

Probably happened too fast to be seen on the star trails.

Peter.

Just thinking out loud here, maybe there is a very localised abberation in the lens of the camera, either that or the camera shifted position and then went back to exactly where it was.
If you had the tripod on concrete slabs and were walking about, this could cause it, but if it was on something like sand, then it wouldn't.

Pick out the brightest star, scale up the image and crank up the levels to see if there is a tiny spike along its line, although I would guess that its probabily impossible to detect.

Maybe there is a very nearby black hole and it passed just above it (from our point of view) and the light was refracted around its event horizon, :lol:

lensing due to a huge clump of dark matter :lol:

It might even have been a small earthquake! Or a shockwave from blasting in a mine/quary somewhere.

Bart.