Tracked using my open source NEOTraker software! https://github.com/AstronomyLiveYt/NEOTraker/blob/master/NEOTraker.py Orion ST-80 riding piggyback on an LX200 Classic SBIG ST-2000XCM with 2 minute exposures ... https://www.youtube.com/watch?v=nDGBQhG0NqQ

I will note that just a couple of minutes after the end of my tracking video, Hubble was scheduled to begin observing another quasar designated SDSSRM-300. I'm not sure exactly when the slew to that object would have occurred, but since it was only 1 degree away from the previous quasar, the difference in the observed pointing attitude would be negligible. Either way, my video confirms that the Hubble Space Telescope was pointing in the expected direction at that time. Music: Crepuscular Rays by Stellardrone ... https://www.youtube.com/watch?v=eoVFPQLp3Bg

Annales de L'Observatoire Impérial de Paris 1857 (Astrometry of comet Lexell): http://dropcanvas.com/w7mp6/6 Digitization and conversion calculations for the ecliptical astrometry of comet Lexell: http://dropcanvas.com/w7mp6/4 Orbital solution and close approach distance: http://dropcanvas.com/w7mp6/2 ... https://www.youtube.com/watch?v=SGwP6RcD-t4

Update with enhanced processing of the STEREO images: http://www.youtube.com/watch?v=nzc_SZR-8zE Fits image files from STEREO Behind HI2 processed with PixInsight STEREO Behind HI2 view simulated using Celestia ( http://www.shatters.net/celestia ) ... https://www.youtube.com/watch?v=ojZ3NWNgXLs