Clear sky - on a Bank Holiday?

Blog the previous nights viewing. Link to images on the gallery or simply describe what you observed the night before. Leave the technical and howto in another forum.
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rwilkinson
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Clear sky - on a Bank Holiday?

Post by rwilkinson » Mon Aug 29, 2016 7:42 pm

(I can't remember when that last happened!) Anyway, I took advantage of the conditions this afternoon to set up my Lunt solar scope, and had a go at imaging a solar prominence with a Philips mono webcam.

The webcam's 8-bit converter doesn't have enough dynamic range to capture the bright disk and faint prominence in one go, so I had to do two imaging runs with high & low gain settings.

Then I've spent a couple of hours playing with AutoStakkert and IRIS (including use of the CIRCLE2, DISK1 & TRANS commands, manual background subtraction and Merge function) to re-combine the data into a single image:
sun_29aug_2.png
Solar prominence on 29th August, imaged with Lunt LS30 and Philips webcam fitted with MagiMate Barlow-lens.
sun_29aug_2.png (522.29 KiB) Viewed 3849 times

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