Observation by Chris Hooker: Mercury, 5th November 2021
Uploaded by
Chris Hooker
Observer
Chris Hooker
Observed
2021 Nov 05 - 10:45
Uploaded
2021 Nov 05 - 16:31
Objects
Mercury
Equipment
- 254mm Newtonian
- 5x IR Barlow
- Baader 685 nm IR pass filter & 850 nm short-pass filter
- ZWO ASI174MM camera
Exposure
0.5 msec @ F/31
Location
Didcot, Oxfordshire
Target name
Mercury
Title
Mercury, 5th November 2021
About this image
A gibbous Mercury imaged in (initially) very bad seeing which made focusing impossible. This was apparently due to a local heat source, because after some time the seeing steadied and the image became quite good. Out of 67 captured video sequences, 24 yielded a total of 8000 good frames, which did not require selection by eye to produce usable stacks. The results are consistent with a softened WinJupos image. The bright spot in the 7 o'clock position is the crater Debussy; Kuiper is near the limb at about 8.30 but cannot be seen as a distinct feature; it is visible in the non-blurred WinJupos image.
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Comments
Good work Chris. What altitude was Mercury when imaging?
M
Thanks, Martin. Mercury was about as high as it gets right now, around 28 degrees altitude. I'm very glad I decided to persevere through the bad seeing, as otherwise I would have missed getting this image!
Chris
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