– Timimg: It should be possible to measure the contact times as accurately as possible. If the absolute time is not accurate, it should be possible to measure the duration as accurately as possible. – Mars is only about 5 arcsec away, so you will need a telescope with a longer focal length. – The maximum duration is only ~0.5 seconds. You should therefore integrate a maximum of 100 ms (10 fps), preferably less (20 fps or more). For as many ‘frames per second’ as possible, the image field (‘Region Of Interest’, ROI) should be kept small. The computer then has to shovel less data; no dropped frames, low latency. There are two comparison stars of 10 mag nearby; you should have them in the image. Reduce the ROI so that the two reference stars are east and west in the field, not much more. – The star is a double star. It is possible that only one component will be occulted and the drop in brightness is smaller or even gradual.
