Today (9 May 2016) a quite rare phenomenon occurred: a transit of Mercury across the Sun.
Here is an animation of four subsequent frames with an interval of about half an hour between.
A small moving spot is Mercury, other features on Sun's disk are sunspots.
Before stacking, Sun's images were manually aligned (rotated) using the first frame as a reference; angle of rotation was determined by sunspots. Of course, such an alignment is quite approximate.
(Sun orientation itself is arbitrary)
The picture beneath is a result of processing of 5 frames shotted at ~15:03 (UT+2).
See also time-lapse video of a beginning of the transit:
Part of the video, processed with PIPP+Autostakkert2+Registax6:
The setup :)
Here is an animation of four subsequent frames with an interval of about half an hour between.
A small moving spot is Mercury, other features on Sun's disk are sunspots.
(Sun orientation itself is arbitrary)
The picture beneath is a result of processing of 5 frames shotted at ~15:03 (UT+2).
ISO=100; F/11; 1/4000s (5 frames of 10). Processing: PIPP (10 frames); Autostakkert2 (5 frames of 10); RegiStax6 (wavelets, contrast, gamma); AstraImage (adaptive filter); FSViewer (rotation, cropping, zooming).
Part of the video, processed with PIPP+Autostakkert2+Registax6:
The setup :)
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