Mercury, R610, 2023-04-03, 17h34 Ut (Philippe Germon)

Contains: Solar system body or event

Mercury, R610, 2023-04-03, 17h34 Ut

Acquisition type: Lucky imaging

Mercury is a very difficult planetary target. Small, close to the Sun and not very shiny regarding to the background sky.
And most of the time, you have to image this planet at dawn or dusk when Sun is hidding behind Earth's horizon and produce temperature's change in the atmophere.
This is the moment when tha high atmosphere is shifting from beeing heated by Sun and Cooling down.
There is 3-4 minutes when the shift is occuring and atmospheric turbulence is stabilizing for a short moment.
And you also need the tube to be stabilized too for internal turbulence.
On April 4th 2023, right before dusk, conditions were reunited even if there were a little bit of atmospheric turbulence and not enought contrast between planet Mercury and dark-blue backgound sky. Also, still behind in the day's light makes it more difficult to focus with the PC's screen. R610 provided more signal than IR850.

Electric filter wheel helped a lot to choose from different filters in a short time : UV, IR 850 and finaly Badder R610 which allows camera ASI 462 MC to be used in MONO8 mode in a bandpass -Red 610Nm + IR) where this camera has almost equal QE on 3 channels (R-G-B).

Result is not "magic" or "awesome" but "not too bad", regarding of the circumstances of a first opportunity and first attempt too...

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Mercury, R610, 2023-04-03, 17h34 Ut

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