Arcturus

From the author of Sizing Up The Universe

21:08 EDT May 13, 2020.
Starlight Express Trius SX-694 on 10" RCOS at f/9.
L = 0.5 sec.

22:30 EDT May 29, 2006.
Starlight Express SXV-H9 on 10" RCOS at f/9.
100 x 0.01 seconds at 1 fps.
Filter: Hα
Sampling: 1 λ/D = 0.8 pixels
Measured: FWHM = 2.26 arcseconds = 3.9 pixels

Linear stretch.
Richardson-Lucy Deconv, Log stretch.
Log stretch, Unsharp mask.

Log stretch movie.
Linear stretch movie, in and out of focus.
Note: Poisson's spot.

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