In the next two minutes I stopped the original sequence and the tracker, therefore captured the position of the object while the celestial objects were trialing in the image. Its image was still a point in every one of my 15s or 30s exposures. It was almost confirmed a geostationary satellite.
But wait! The point seemed to be moving laterally (DEC) across the exposures. Here goes the animation.
It moves at a speed of 30arcsec roughly every 2 minutes. This is trivial compared to its 15arcsec/sec speed around RA axis.
LIkely it was at an altitude similar to geostationary satellites, or 36000km. Given its brightness at such a distance, the size must be considerable.
Just, what could it be? Could it even be a near earth asteriod?
If it is an asteroid, its orbital inclination is nearly perfectly aligned with the earth's equator, not the ecliptic. This is somewhat unlikely.
