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Venus in IR, 31st May


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About this observation
Chris Hooker
Time of observation
31/05/2020 - 10:07
Observing location
Didcot, Oxfordshire
254 mm Newtonian
2x Barlow
ZWO ASI174MM camera
IR-pass filter (650 nm)
0.26 ms @ F/12.5

Venus at 0.4% illumination, just over 5 degrees from the Sun, which is slightly further than ideal for conjunction imaging. A strip of kitchen foil was required, taped to the inside of the telescope tube, to reflect the focusing cone of sunlight and avoid it being absorbed by the black paint and generating tube currents. The mirror was partly sunlit, so the tube had to be kept covered for most of the time. The cover was removed, the image centred and a few videos captured before the heating of the primary degraded the image too much. This process was repeated every 5 minutes or so. The image is processed from a stack of the best 275 frames from three videos, each one the first capture of its sequence, processed in PIPP and Registax. An overprocessed image shows the cusp extensions, and an estimate of their extent was made by drawing lines in Powerpoint and rotating them until they ran from the centre of the planet to the extreme end of each cusp.

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