Click on the picture to see the full-sized image
Although the full-sized picture above is not as good as that of the 6th January 2021, I have included it here for two reasons. Firstly the phase is at the other end of the Day-21 interval, and, secondly, the libration in latitude is very different. The difference of over 9° can be clearly seen by looking at the craters in the far south, Tycho and Clavius for example, which appear much closer to the limb in the earlier photograph. This later picture was taken with greater difficulty; the altitude of the Moon was only 11° and atmospheric conditions were poor. I found that my usual way of correcting for atmospheric dispersion (Registax) did not work well, so I modified my linearisation routine to extract only the green component of the picture thus creating a monochrome image. Even so the final image is not of the best.
Day: 21.9
Date & Time: 6th January 2021, 03:46 UT
Libration: latitude -5° 36', longitude -2° 36'
Lunar Phase: 273.4°
Colongitude: 179.8°
Telescope: 8-inch Ritchey-Chrétien
Camera: Canon 1100D DSLR
Capture: 10 frames, 1/160 sec, ISO 400
Processing: Irfanview. Convert .CR2 files to bmp format.
Linearised by my own software.
Registax. 10 frames stacked. Wavelets 1-3 = 20.
Focus Magic 7.
PhotoImpact. Contrast and Brightness 10
Day: 21.0
Date & Time: 24th March 2022, 04:55 UT
Libration: latitude 3° 53', longitude -0° 43'
Lunar Phase: 283.6°
Colongitude: 167.2°
Telescope: 8-inch Ritchey-Chrétien
Camera: Canon 1100D DSLR
Capture: 10 frames each, 1/60, 1/100 sec, ISO 800
Processing: Irfanview. Convert .CR2 files to bmp format.
Linearised and rendered into monochrome by my own software.
Registax. 20 frames stacked. Wavelets 1-2 = 20.
Focus Magic. Despeckle radius 2, refocus radius 10.
PhotoImpact. Contrast and Brightness 10
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