Venus in thermal range (8-14um)
Taken by Wah! on July 5, 2023 @
Canada
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Camera Used: Unavailable Unavailable
Exposure Time: Unavailable
Aperture: Unavailable
ISO: Unavailable
Date Taken: Unavailable
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Details:
20230705 Thermal Venus
16” f/4.5 Dobsonian + lensless Infiray T3
Initially, I thought it was out of focus, but after moving the sensor in and out, I found that it was actually in focus. Although Venus is in the crescent phase in visible light, we can still see the whole ball under the thermal wavelength since the planet is super hot even at night.
I have done some math:
Venus's angular size is around 36sec=0.01degree today
Infiray pixel size is 17um=0.017mm
Telescope focal length = 400*4.5=1800mm
Venus image occupies: sin(0.01degree)*1800/0.017=18pixels
Photographer's website:
No URL provided.
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