On March 2021 the asteroid 1999 RM45 was reaching its best visibility for InFINNity Deck. This asteroid is approximately 350-750 metres in diameter and had its closest approach at a distance of about 11 light seconds (approximately 7x the Earth-Moon distance).
I had programmed its trajectory in the GM3000HPS mount, which allowed me to follow the asteroid unguided. On 1 March I took a 30 seconds exposure of the part of the sky where the asteroid was expected with adjacent result.
From the image a relative speed of just over 1"/s could be calculated.
The following night I captured the asteroid between 18:53:09 and 19:01:36 UTC using FireCapture and the SkyWatcher Esprit 150ED and ZWO ASI1600 Pro Cool camera combination. Exposure was 5 seconds per frame, the result of which is shown here at a 5fps rate. The asteroid is the faint dot at the centre.
If you have any questions and/or remarks please let me know.
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(4) Vesta 1999 RM45